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XRAY - Master X-Ray Catalog

 HEASARC
Archive

Overview

The XRAY database table contains selected parameters from almost all HEASARC X-ray catalogs that have source positions located to better than a few arcminutes. The XRAY database table was created by copying all of the entries and common parameters from the tables listed in the Component Tables section. The XRAY database table has many entries but relatively few parameters; it provides users with general information about X-ray sources, obtained from a variety of catalogs. XRAY is especially suitable for cone searches and cross-correlations with other databases. Each entry in XRAY has a parameter called 'database_table' which indicates from which original database the entry was copied; users can browse that original table should they wish to examine all of the parameter fields for a particular entry. For some entries in XRAY, some of the parameter fields may be blank (or have zero values); this indicates that the original database table did not contain that particular parameter or that it had this same value there.

The HEASARC in certain instances has included X-ray sources for which the quoted value for the specified band is an upper limit rather than a detection. The HEASARC recommends that the user should always check the original tables to get the complete information about the properties of the sources listed in the XRAY master source list.

Provenance

This master catalog is updated periodically whenever one of the component database tables is modified or a new component database table is added.

Component Tables

The XRAY database table was created by copying all of the entries and common parameters from the following database tables: 
 * XRBCAT     - X-Ray Binaries Catalog
 * HMXBCAT    - High-Mass X-Ray Binaries Catalog (Liu et al.)
 * MAGHMXBCAT - Magellanic Clouds High-Mass X-Ray Binaries Catalog (Liu et al.)
 * LMXBCAT    - Low-Mass X-Ray Binaries Catalog (Liu et al.)
 * RITTERLMXB - Ritter Low-Mass X-Ray Binaries Catalog (Ritter, Kolb)
 * SFGALHMXB  - Star-Forming Galaxies High-Mass X-Ray Binaries Catalog (Mineo et al.)
 * ULXRBCAT   - Ultraluminous X-Ray Sources in External Galaxies Catalog (Liu, Mirabel)
 * ULXNGCAT   - Ultraluminous X-Ray Sources in Nearby Galaxies Catalog (Swartz et al.)

 * BAXGALCLUS - BAX X-Ray Galaxy Clusters and Groups Catalog (Sadat et al.)

 * A2PIC      - HEAO 1 A2 Piccinotti Catalog
 * A4         - HEAO 1 A4 Catalog of High-Energy X-Ray Sources

 * EMSS       - Einstein Extended Medium Sensitivity Survey
 * HRICFA     - Einstein High Resolution Imager (HRI) Source List
 * HRIDEEP    - Einstein HRI Deep Survey Source Positions
 * IPC        - Einstein Imaging Proportional Counter (IPC) Source List
 * IPCDEEP    - Einstein IPC Deep Survey Source Positions
 * IPCOSTARS  - Einstein IPC Measures of Count Rates for O Stars
 * IPCSLEW    - Einstein IPC Slew Survey Catalog
 * LMCXRAY    - Einstein IPC Discrete X-Ray Sources in the Direction of the LMC
 * SMCXRAY    - Einstein IPC Discrete X-Ray Sources in the Direction of the SMC
 * IPCULTSOFT - Einstein IPC Ultrasoft Sources Catalog
 * EXSS       - Einstein Extended Source Survey
 * EINSTEIN2E - Einstein 2E Catalog of IPC X-Ray Sources
 * EINOPSLGAL - Einstein Survey of Optically Selected Galaxies
 * EINGALCAT  - Einstein Observatory Galaxies Catalog
 * EINGALCLUS - Einstein Observatory Clusters of Galaxies Catalog

 * CMA        - EXOSAT Channel Multiplier Array (CMA) 'Good' Source List
 * EXOHGLS    - EXOSAT CMA High Galactic Latitude Survey

 * RASSBSC    - ROSAT All-Sky Survey Bright Source Catalog
 * WGACAT     - ROSAT PSPC White, Giommi, and Angelini 'Good' Source Catalog
 * RBS        - ROSAT Bright Survey (Schwope et al.)
 * LMCHRIXRAY - ROSAT HRI Catalog of LMC X-Ray Sources (Sasaki et al.)
 * SMCROSXRY2 - ROSAT PSPC Catalog of SMC X-Ray Sources (Haberl et al.)
 * ROSPSPC    - ROSAT Results Archive Sources for the PSPC ('Good' Sample)
 * ROSPSPCF   - ROSAT Results Archive Sources for the PSPC with Filter ('High Confidence' Sample)
 * RASSHGSOFT - ROSAT All-Sky Survey: Soft High Galactic-Latitude X-Ray Sources (Thomas et al. 1998)
 * RASSHGSFT2 - ROSAT All-Sky Survey: Soft High Galactic-Latitude X-Ray Sources 2 (Beuermann et al. 1999)
 * RASSFSC    - ROSAT All-Sky Survey Faint Source Catalog
 * CHASFRXRAY - ROSAT All-Sky Survey: Chamaeleon Star Forming Region Study
 * LMCROSXRAY - ROSAT PSPC Catalog of LMC X-Ray Sources (Haberl & Pietsch)
 * SMCROSXRAY - ROSAT PSPC Survey of the Small Magellanic Cloud
 * RASSCNS3   - ROSAT All-Sky Survey: Nearby Stars
 * ROSHRI     - ROSAT Results Archive Sources for the HRI ('Good' Sample)
 * ORIONXRAY  - ROSAT Survey of the Orion Nebula
 * RASSWD     - ROSAT All-Sky Survey: White Dwarves
 * RASSOB     - ROSAT All-Sky Survey: OB Stars
 * M31ROSXRAY - ROSAT PSPC M31 Source Catalog
 * RASSDWARF  - ROSAT All-Sky Survey: A-K Dwarfs/Subgiants
 * ROSATRLQ   - ROSAT Radio-Loud Quasars Catalog
 * ROSATRQQ   - ROSAT Radio-Quiet Quasars Catalog
 * RASSGIANT  - ROSAT All-Sky Survey: Giants & Supergiants
 * DXRBS      - ROSAT Deep X-Ray Radio Blazar Survey (Perlman et al. 1998; Landt et al. 2001)
 * PLEIADXRAY - ROSAT PSPC Catalog of the Pleiades (Micela et al. 1996)
 * BMWHRICAT  - Brera Multi-scale Wavelet (BMW) ROSAT HRI Source Catalog
 * REFLEX     - ROSAT-ESO Flux-Limited X-Ray (REFLEX) Galaxy Cluster Survey
 * RASSNORSAM - ROSAT All-Sky Survey Completely Identified Northern Sample Catalog
 * HRASSCAT   - Hamburg/ROSAT All-Sky Survey X-Ray Source Catalog
 * RIXOS      - ROSAT International X-Ray/Optical Survey Source Catalog
 * NORAS      - Northern ROSAT All-Sky (NORAS) Galaxy Cluster Survey Catalog
 * RASSDSSAGN - ROSAT All-Sky Survey and SDSS Sample of X-Ray Emitting AGN
 * RASSEBCS   - ROSAT All-Sky Survey Extended Brightest Cluster Sample
 * ROSGALCLUS - ROSAT PSPC Catalog of Clusters of Galaxies
 * RBSCNVSS   - ROSAT All-Sky Survey/NVSS Bright X-Ray Source Sample
 * ROSNEPAGN  - ROSAT North Ecliptic Pole Survey Active Galactic Nuclei Catalog
 * ROSNEPXRAY - ROSAT North Ecliptic Pole Survey X-Ray Source Catalog
 * BHRFSCID   - Byurakan/Hamburg/ROSAT Catalog of Optical IDs
 * ROXA       - ROXA (Radio-Optical-X-ray at ASDC) Blazars Catalog (Turriziani et al.)
 * ROS400GCLS - ROSAT PSPC 400 Square Degree Galaxy Cluster Catalog (Burenin et al.)
 * RASSDSSTAR - ROSAT All-Sky Survey and SDSS Sample of X-Ray Emitting Stars (Agueros et al.)
 * RASS2MASS  - ROSAT All-Sky Survey BSC/2MASS PSC Cross-Associations XID II Catalog (Haakonsen, Rutledge)
 * RASSUSNOID - ROSAT All-Sky Survey Bright Source Catalog USNO A2 Cross-Associations Catalog (Rutledge et al.)
 * CMAR1XRAY  - ROSAT PSPC Catalog of Canis Major R1 X-Ray Sources (Gregorio-Hetem et al.)
 * RASS6DFGS  - ROSAT All-Sky Survey/6dF Galaxy Survey Catalog of X-Ray Selected AGN (Mahony et al.)
 * RASSASASEB - RASS/All-Sky Automated Survey Eclipsing Binaries Catalog (Szczygiel et al.)
 * RASSAEQSO  - ROSAT All-Sky Survey/ASIAGO-ESO QSO Survey Catalog (Grazian et al.)
 * WARPS      - Wide Angle ROSAT Pointed Survey, First Phase (WARPS-I) (Perlman et al.)
 * WARPS2     - Wide Angle ROSAT Pointed Survey, Second Phase (WARPS-II) Clusters Catalog (Horner et al.)
 * ETGALXRAY  - Early-Type Galaxies X-Ray Luminosities Catalog (O'Sullivan et al.)
 * GALCENPSPC - ROSAT PSPC Galactic Center Soft X-Ray Source Catalog (Sidoli et al.)
 * RASSFIRST  - ROSAT All-Sky Survey Single FIRST Matches Catalog (Brinkmann et al.)
 * RASSBSCPGC - ROSAT All-Sky Survey Bright Source Catalog/Catalog of Principal Galaxies Matches (Zimmermann et al.)
 * ROSATHARD  - ROSAT Hard-Spectrum X-Ray Source Catalog (Page et al.)
 * RASSCNDINS - ROSAT All-Sky Survey Candidate Isolated Neutron Stars (Turner et al.)
 * W2RAGNCAT  - WISE/2MASS/RASS (W2R) AGN Sample Catalog (Edelson, Malkan)

 * ASCAGIS    - ASCA Gas Imaging Spectrometer (GIS) Source Catalog (Ueda et al.)
 * ASCASIS    - ASCA Solid-State Imaging Spectrometer (SIS) Source Catalog (Gotthelf, White)
 * TARTARUS   - Reduced ASCA AGN Data (Version 3.1) (Turner et al.)
 * ASCAGPS    - ASCA Galactic Plane Survey of Faint X-Ray Sources (Sugizaki et al.)
 * ASCALSS    - ASCA Large Sky Survey (Ueda et al.)
 * ASCAEGCLUS - ASCA Elliptical Galaxies and Galaxy Clusters Catalog (Fukazawa et al.)

 * SAX2TO10   - BeppoSAX 2-10 keV Survey (Giommi, et al.)
 * SAXWFCCAT  - BeppoSAX Wide Field Camera X-Ray Source Catalog (Verrecchia et al.)
 * SAXWFCCAT2 - BeppoSAX Wide Field Camera Unbiased X-Ray Source Catalog (Capitanio et al.)

 * CHANDFN2MS - Chandra Deep Field North 2-Megasecond Catalog (Alexander et al.)
 * CHANDFS1MS - Chandra Deep Field South 1-Megasecond Catalog (Giacconi et al.)
 * CHANDFS2MS - Chandra Deep Field South 2-Megasecond Catalog (Luo et al.)
 * CHANDFS4MS - Chandra Deep Field South 4-Megasecond Catalog (Xue et al.)
 * CHANSEXSI  - Chandra Serendipitous Extragalactic X-Ray Source ID Catalog (Harrison et al.)
 * CLASXS     - Chandra Large-Area Synoptic X-Ray Survey of Lockman Hole-NW (Yang et al.)
 * M31CXOXRAY - M 31 Central Region Chandra X-Ray Point Source Catalog (Kong et al.)
 * M31CXO2    - M 31 Bulge Chandra X-Ray Point Source Catalog (Voss, Gilfanov)
 * M33CXOXRAY - M 33 Chandra X-Ray Point Source Catalog (Grimm et al.)
 * CHANEXTDFS - Chandra Extended Deep Field South Pt Source Catalog (Lehmer et al.)
 * XBOOTES    - An X-Ray Survey of the NDWFS Bootes Field (Kenter et al.)
 * COUP       - Chandra Orion Ultradeep Point Source Catalog (Getman et al.)
 * CHPNGPTSRC - Chandra Nearby Galaxies Point Source Catalog (Colbert et al.)
 * CHAMPPSC   - Chandra Multiwavelength Project (ChaMP) Point Source Catalog (Kim et al.)
 * CHANNSGPSC - Chandra Nearby Spiral Galaxies Point Source Catalog (Kilgard et al.)
 * CHANTYPGPR - Chandra Typical Galactic Plane Region Point Source Catalog (Ebisawa et al.)
 * NGC2024CXO - NGC 2024 Chandra X-Ray Point Source Catalog (Skinner et al.)
 * NGC2237CXO - NGC 2237 Chandra X-Ray Point Source Catalog (Wang et al.)
 * NGC2244CXO - NGC 2244/Rosette Nebula Chandra X-Ray Point Source Catalog (Wang et al.)
 * NGC2264CXO - NGC 2264 Chandra X-Ray Point Source Catalog (Ramirez et al.)
 * NGC2264CX2 - NGC 2264 Chandra X-Ray Point Source Catalog 2 (Flaccomio et al.)
 * NGC2516CXO - NGC 2516 Chandra X-Ray Point Source Catalog (Damiani et al.)
 * NGC2808CXO - NGC 2808 Chandra X-Ray Point Source Catalog (Servillat et al.)
 * NGC6530CXO - NGC 6530 Chandra X-Ray Point Source Catalog (Damiani et al.)
 * IC1396NCXO - IC 1396N Chandra X-Ray Point Source Catalog (Getman et al.)
 * IC348CXO   - IC 348 Chandra X-Ray Point Source Catalog (Preibisch, Zinnecker)
 * IC348CXO2  - IC 348 Chandra X-Ray Point Source Catalog 2 (Stelzer et al.)
 * TRIFIDCXO  - Trifid Nebula (M 20) Chandra X-Ray Point Source Catalog (Rho et al.)
 * MONR2CXO   - Monoceros R2 Cloud Chandra X-Ray Point Source Catalog (Nakajima et al.)
 * M67CXO     - M 67 Chandra X-Ray Point Source Catalog (van den Berg et al.)
 * OMC2P3CXO  - OMC-2 and OMC-3 Chandra X-Ray Point Source Catalog (Tsujimoto et al.)
 * CEPBOB3CXO - Cep B/OB3 Star-Forming Region Chandra X-Ray Point Source Catalog (Getman et al.)
 * CYGTEVCXO  - Cygnus TeV Source Chandra X-Ray Point Source Catalog (Butt et al.)
 * CHAINTHCXO - Chamaeleon I North Cloud Chandra X-Ray Point Source Catalog (Feigelson, Lawson)
 * LMC30DRCXO - LMC 30 Doradus Complex Chandra X-Ray Point Source Catalog (Townsley et al.)
 * RCW38CXO   - RCW 38 Chandra X-Ray Point Source Catalog (Wolk et al.)
 * RCW38CXO2  - RCW 38 Chandra X-Ray Point Source Catalog 2 (Winston et al.)
 * RHOOPHCXO  - Rho Ophiuchi SFR Chandra X-Ray Point Source Catalog (Imanishi et al.)
 * CENACXO    - Centaurus A Galaxy Chandra X-Ray Point Source Catalog (Kraft et al.)
 * ELAISCXO   - ELAIS N1 and N2 Fields Chandra X-Ray Point Source Catalog (Manners et al.)
 * NGC2362CXO - NGC 2362 Chandra X-Ray Point Source Catalog (Damiani et al.)
 * NGC1333CXO - NGC 1333 Chandra X-Ray Point Source Catalog (Getman et al.)
 * ORIONFFCXO - Orion Flanking Fields Chandra X-Ray Point Source Catalog (Ramirez et al.)
 * CHANULXCAT - Chandra Archive Of Galaxies Ultraluminous X-Ray Source Catalog (Swartz et al.)
 * ONCCXOXRAY - Orion Nebula Cluster Chandra HRC X-Ray Point Source Catalog (Flaccomio et al.)
 * M81CXO     - M 81 Chandra X-Ray Discrete Source Catalog (Swartz et al.)
 * M81CXO2    - M 81 Chandra X-Ray Source Catalog (Sell et al.)
 * M87CXO     - M 87 Chandra X-Ray Point Source Catalog (Jordan et al.)
 * CYDER      - Calan-Yale Deep Extragalactic Research Survey X-Ray Source Catalog (Treister et al.)
 * LALABOOCXO - LALA Bootes Field Chandra X-Ray Point Source Catalog (Wang et al.)
 * LALACETCXO - LALA Cetus Field Chandra X-Ray Point Source Catalog (Wang et al.)
 * CHAMPHXAGN - CHAMP (Chandra Multiwavelength Project) Hard X-Ray Emitting AGN (Silverman et al.)
 * M51CXO     - M 51 Chandra X-Ray Discrete Source Catalog (Terashima, Wilson)
 * SWIRECXO   - Spitzer Wide-Area IR Extra-Galactic Survey Chandra X-Ray Sources (Franceschini et al.)
 * SWIRELHCXO - SWIRE/Chandra Lockman Hole Field X-Ray Source Catalog (Wilkes et al.)
 * NGC4649CXO - NGC 4649 Chandra X-Ray Discrete Source Catalog (Randall et al.)
 * SPICESCXO  - SPICES Lynx Field Chandra X-Ray Source Catalog (Stern et al.)
 * NGC4472CXO - NGC 4472 Chandra X-Ray Point Source Catalog (Maccarone et al.)
 * GC47TUCCXO - 47 Tuc Globular Cluster Chandra X-Ray Point Source Catalog (Heinke et al.)
 * ARCQUINCXO - Arches and Quintuplet Clusters Chandra X-Ray Point Source Catalog (Wang et al.)
 * M101CXO    - M 101 Chandra X-Ray Point Source Catalog (Pence et al.)
 * M17CXO     - M 17 Chandra X-Ray Point Source Catalog (Broos et al.)
 * GWSSTRPCXO - Groth-Westphal Strip Chandra X-Ray Point Source Catalog (Nandra et al.; Georgakakis et al.)
 * CDFSAGNCXO - Chandra Deep Field South AGN Spectral Properties Catalog (Tozzi et al.)
 * RCW49CXO   - RCW 49 Chandra X-Ray Point Source Catalog (Tsujimoto et al.)
 * NGC6357CXO - NGC 6357 Chandra X-Ray Point Source Catalog (Wang et al.)
 * M33CHASE   - M 33 Chandra ACIS Survey (ChASeM33) Final Source Catalog (Plucinsky et al.)
 * CYGOB2CXO  - Cygnus OB2 Association Chandra X-Ray Point Source Catalog (Albacete Colombo et al.)
 * CYGOB2CXO2 - Cygnus OB2 Association Chandra X-Ray Point Source Catalog 2 (Wright, Drake)
 * WD1CXO     - Westerlund 1 Chandra X-Ray Point Source Catalog (Clark et al.)
 * SMCWINGCXO - Small Magellanic Cloud Wing Survey Chandra X-Ray Point Source Catalog (McGowan et al.)
 * RCW108CXO  - RCW 108 Star Formation Region Chandra X-Ray Point Source Catalog (Wolk et al.)
 * BMWCHANCAT - Brera Multi-scale Wavelet (BMW) Chandra Source Catalog
 * CHAMPLANE  - Chandra Multiwavelength Plane Survey Optical ID Catalog (Koenig et al.)
 * CHAMPLANEX - ChaMPlane Galactic Bulge and Center X-Ray Source Catalog (Hong et al.)
 * NGC752CXO  - NGC 752 Chandra X-Ray Point Source Catalog (Giardino et al.)
 * CLANS      - Chandra Lockman Area North Survey (CLANS) X-Ray Source Catalog (Trouille et al.)
 * CHESSCAT   - ChaMP Extended Stellar Survey (ChESS) X-Ray Catalog (Covey et al.)
 * AEGISX     - AEGIS-X Chandra Extended Groth Strip X-Ray Point Source Catalog (Laird et al.)
 * ETGALCXO   - Early-Type Galaxies Chandra X-Ray Point Source Catalog (Humphrey, Buote)
 * CAIXA      - Catalog of AGN in the XMM-Newton Archive (Bianchi et al.)
 * GALCENCXO  - Galactic Center Chandra X-Ray Point Source Catalog (Muno et al.)
 * HPERSEICXO - h Persei Chandra X-Ray Point Source Catalog (Currie et al.)
 * SDSSCXOQSO - Sloan Digital Sky Survey Quasars Detected by Chandra (Green et al.)
 * ECDFSCXO   - Extended Chandra Deep Field-South X-Ray Point Source Catalog (Virani et al.)
 * NGC4278CXO - NGC 4278 Chandra X-Ray Point Source Catalog (Brassington et al.)
 * NGC4636CXO - NGC 4636 Chandra X-Ray Point Source Catalog (Posson-Brown et al.)
 * ROSETTECXO - Rosette Molecular Cloud Chandra X-Ray Point Source Catalog (Wang et al.)
 * NGC6334CXO - NGC 6334 Chandra X-Ray Point Source Catalog (Feigelson et al.)
 * CCOSMOSCAT - Chandra COSMOS (C-COSMOS) Survey X-Ray Point Source Catalog (Elvis et al.)
 * CCOSRSSFAG - Chandra COSMOS Radio-Selected Star-Forming Galaxies and AGN Catalog (Ranalli et al.)
 * SSA22CXO   - SSA22 Field Chandra X-Ray Point Source Catalog (Lehmer et al.)
 * LKHA101CXO - LkH-alpha 101 Star Formation Region Chandra X-Ray Point Source Catalog (Wolk et al.)
 * SMCDFSCXO  - Small Magellanic Cloud Deep Fields X-Ray Point Source Catalog (Laycock et al.)
 * GCPTSRCCXO - Chandra Point Sources in 18 Distant Galaxy Clusters (Branchesi et al.)
 * CG12CXO    - CG 12 Chandra X-Ray Point Source Catalog (Getman et al.)
 * CHNGPSCLIU - Chandra ACIS Survey of Nearby Galaxies X-Ray Point Source Catalog (Liu)
 * M71CXO     - M 71 Chandra X-Ray Point Source and Optical/Infrared Counterparts Catalog (Elsner et al.)
 * W40SFRCXO  - W 40 Star-Forming Region Chandra X-Ray Point Source Catalog (Kuhn et al.)
 * CARINACXO  - Carina Nebula Chandra X-Ray Point Source Catalog (Broos et al.)
 * OMEGCENCXO - Omega Centauri Globular Cluster Chandra X-Ray Point Source Catalog (Haggard et al.)
 * CHANGBSCAT - Chandra Galactic Bulge Survey X-Ray Point Source Catalog (Jonker et al.)
 * S254258CXO - S254-S258 Star-Forming Region Chandra X-Ray Point Source Catalog (Mucciarelli et al.)
 * CHAMPSDSSA - CHAMP/SDSS Nearby Low-Luminosity AGN Catalog (Constantin et al.)
 * NGC1893CXO - NGC 1893 Chandra X-Ray Point Source Catalog (Caramazza et al.)
 * NGC1291CXO - NGC 1291 Chandra X-Ray Point Source Catalog (Luo et al.)
 * NGC2403CXO - NGC 2403 Central 3-kpc Region Chandra Source Catalog (Yukita et al.)
 * XDEEP2     - DEEP2 Galaxy Redshift Survey Fields Chandra Point Source Catalog (Goulding et al.)

 * XMMSSC     - XMM-Newton Serendipitous Source Catalog (2XMMi DR3)
 * XMMSSCLWBS - XMM-Newton 2XMMi-DR3 Selected Source Classifications Catalog
 * XMMGPS     - XMM-Newton Galactic Plane Survey (XGPS)
 * M31XMMXRAY - XMM-Newton M31 Survey Catalog
 * M31XMM2    - M31 XMM-Newton Spectral Survey X-Ray Point Source Catalog (Shaw Greening et al.)
 * M33XMMXRAY - XMM-Newton M33 Survey Catalog
 * M33XMM2    - M33 XMM-Newton X-Ray Variability Source Catalog (Misanovic et al.)
 * XMMCFRSCAT - XMM-Newton/Canada-France Redshift Survey Fields X-Ray Sources
 * XMDSVVDS4S - XMM-Newton Medium Deep Survey/VIRMOS VLT Deep Survey 4-Sigma Catalog (Chiappetti et al.)
 * XMMSLEWCLN - XMM-Newton Slew Survey Clean Source Catalog
 * XMMSLEWEGS - XMM-Newton Slew Survey Extragalactic Sample (Warwick et al.)
 * XMMBSS     - XMM-Newton Bright Serendipitous Survey (Della Ceca et al.)
 * NGC2547XMM - NGC 2547 XMM-Newton X-Ray Point Source Catalog (Jeffries et al.)
 * EROSXMM    - Extremely Red Objects XMM-Newton Survey Catalog (Brusa et al.)
 * LUPUS3XMM  - Lupus 3 SFR XMM-Newton X-Ray Point Source Catalog (Gondoin)
 * NGC2516XMM - NGC 2516 Cluster XMM-Newton X-Ray Point Source Catalog (Pillitteri et al.)
 * NGC2808XMM - NGC 2808 XMM-Newton X-Ray Point Source Catalog (Servillat et al.)
 * NGC6231XMM - NGC 6231 XMM-Newton X-Ray Source Catalog (Sana et al.)
 * NGC6530XMM - NGC 6530 XMM-Newton X-Ray Point Source Catalog (Rauw et al.)
 * UPPRSCOXMM - Upper Sco XMM-Newton X-Ray Point Source Catalog (Argiroffi et al.)
 * SIGORIXMM  - Sigma Orionis Cluster XMM-Newton X-Ray Point Source Catalog (Franciosini et al.)
 * NGC2516XMM - NGC 2516 Cluster XMM-Newton X-Ray Point Source Catalog (Pillitteri et al.)
 * OMEGCENXMM - Omega Centauri XMM-Newton X-Ray Point Source Catalog (Gendre et al.)
 * MARANOXMM  - Marano Field XMM-Newton X-Ray Source Optical Counterparts Catalog (Krumpe et al.)
 * CEPAXMM    - Cepheus A SFR XMM-Newton X-Ray Point Source Catalog (Pravdo, Tsuboi)
 * LOCKMANXMM - Lockman Hole Field XMM-Newton X-Ray Point Source Catalog (Mateos et al.)
 * LOCKMANXM2 - Lockman Hole XMM-Newton X-Ray Point Source Catalog (Brunner et al.)
 * AGNSDSSXMM - SDSS/XMM-Newton AGN Spectral Properties Catalog (Akylas et al.)
 * AGNSDSSXM2 - SDSS/XMM-Newton Type1 AGN X-Ray and Radio Properties Catalog (Ballo et al.)
 * TAURUSXMM  - Taurus Molecular Cloud XMM-Newton X-Ray Source Catalog (Guedel et al.)
 * AXIS       - AXIS XMM-Newton Source Catalog (Carrera et al.)
 * ROS13HRXMM - ROSAT 13-hour Field XMM-Newton X-Ray Source Catalog (Loaring et al.)
 * SA57XMM    - Selected Area 57 XMM-Newton X-Ray Source Catalog (Trevese et al.)
 * NGC2264XMM - NGC 2265 XMM-Newton X-Ray Point Source Catalog (Dahm et al.)
 * XMMLSS     - XMM-Newton Large-Scale Structure X-Ray Source Catalog (Pierre et al.)
 * XMS        - XMM-Newton Medium Sensitivity Survey (XMS) Source Catalog (Barcons et al.)
 * CARINAXMM  - Carina OB1 Association XMM-Newton X-Ray Point Source Catalog (Antokhin et al.)
 * ELAISS1XMM - ELAIS S1 Field XMM-Newton X-Ray Source Catalog (Puccetti et al.)
 * SXDSCAT    - Subaru/XMM-Newton Deep Survey X-Ray Source List (Ueda et al.)
 * NGC752XMM  - NGC 752 XMM-Newton X-Ray Point Source Catalog (Giardino et al.)
 * NGC253XMM  - NGC 253 XMM-Newton X-Ray Point Source Catalog (Barnard et al.)
 * XMMCOSMOS  - XMM-Newton COSMOS X-Ray Point Source Catalog (Cappelluti et al.)
 * XMMCOSMAGN - XMM-COSMOS Catalog of X-Ray Selected Type 1 AGN (Lusso et al.)
 * SDSSXMMQSO - Sloan Digital Sky Survey (DR5)/XMM-Newton Quasar Survey Catalog (Young et al.)
 * XMMOBSTARS - XMM-Newton OB Stars Catalog (Naze)
 * COLL69XMM  - Collinder 69 Cluster XMM-Newton X-Ray Point Source Catalog (Barrado et al.)
 * M101XMM    - M 101 XMM-Newton X-Ray Point Source Catalog (Jenkins et al.)
 * IC10XMMCXO - IC 10 XMM-Newton and Chandra X-Ray Point Source Catalog (Wang et al.)
 * M31DEEPXMM - M 31 Deep XMM-Newton Survey X-Ray Source Catalog (Stiele et al.)
 * LAMORIXMM  - Lambda Orionis Cluster XMM-Newton X-Ray Point Source Catalog (Franciosini, Sacco)
 * CYGOB2XMM  - Cygnus OB2 Association XMM-Newton X-Ray Point Source Catalog (Rauw)
 * XMMVARAGN  - Ensemble X-Ray Variability of AGN in 2XMMi-DR3 (Vagnetti et al. 2011)

 * SWSDSSQSO  - Swift Simultaneous UV, Optical, and X-Ray Observed Quasar Catalog (Gronwall et al. 2012)

 * XTEASSCAT  - RXTE All-Sky Slew Survey Catalog (XSS)

 * MAXIGSCHGL - First MAXI/GSC High Galactic-Latitude Source Catalog (Hiroi et al. 2011)

Caveats

(1) The larger the radius of the cone search used, the more chance there is of finding a spurious match with a random source rather than with the object/position specified. Given the several hundred thousand known X-ray sources contained in the XRAY table, there is a non-negligible (several percent) chance of finding an unrelated match even when using the default 3 arcminutes search radius. Most modern X-ray observatories s such as Chandra, XMM-Newton, ROSAT, etc., can locate source positions to 1 arcminute or better, notice, so that, to be conservative, you might want to reset the radius of the cone search to 1 or even 0.5 arcminutes.

(2) Some X-ray detectors have some sensitivity to ultraviolet light as well as to X-rays, i.e., they have what is called a UV light leak. Particular instruments which are known to have had this feature include the Einstein High Resolution Instrument (HRI), the EXOSAT Low-Energy Telescope Channel Multiplier Array (LET CMA), and the ROSAT HRI. Some objects rich in UV emission, such as stars of spectral types O, B, and A, may thus be listed in source catalogs obtained using these instruments, even though they were detected due to their UV emission rather than any intrinsic X-ray emission. For further information on the Einstein HRI UV leak, see Appendix B of Schmitt et al. (1985, ApJ, 290,307), and on the ROSAT HRI UV leak, see Barbera et al. (2000, ApJ, 545, 449). To estimate the EXOSAT LE UV leak, you can use the FTOOLS utility exoleuv (see http://heasarc.gsfc.nasa.gov/lheasoft/ftools/exosat.html for more information on this task).

Search Cone Radius

The default value for the radius of the cone search is 3 arcminutes, and is generally an appropriate, albeit liberal, value for many of the component tables. You can choose your own radius value, of course, but we suggest that you do not specify a radius larger than 60 arcminutes, as you will be likely get many spurious matches for larger search areas (see Caveats section below).

Parameters

Name
The commonly-used name of the X-ray source, where available. Sometimes, this parameter has been filled through cross-correlations with other HEASARC databases.

Database_Table
The name of the HEASARC database table from which the entry was taken.

RA
The Right Ascension of the X-ray source.

Dec
The Declination of the X-ray source.

LII
The Galactic Longitude of the X-ray source.

BII
The Galactic Latitude of the X-ray source.

Count_Rate
The count rate associated with the X-ray source in counts per second, if available; details for the individual databases are as follows: 

   * A2PIC      - R15 ct/sec of the 1st scan flux, where R15 is the counting
                  rate derived using the 1.5 X 3 degree FWHM FOV of the 2nd
                  layer of the argon counter and both layers of a xenon counter.
                  One R15 count/sec equals about 2.17x10-11 ergs/cm2/sec in
                  the 2-10 keV band.
   * A4         - The fitted count rate for the source, taking into account all of
                  the data from the mission, for channels A+B+C (13 to 80 keV).

   * EMSS       - The corrected IPC count rate in the 0.2-3.5 keV band. The count
                  rate is derived from the net counts, corrected for vignetting,
                  mirror scattering, and point response function scattering, and
                  the livetime, corrected for instrumental dead time.
   * HRICFA     - The corrected HRI count rate, obtained by summing all counts
                  within a circle of radius 18 arc seconds centered on the
                  source position, and then applying the HRI correction factors
                  for exposure time, vignetting, deadtime, mirror scattering,
                  and quantum efficiency.
   * HRIDEEP    - The HRI count rate, corrected for vignetting, scattering, dead
                  time, and detector efficiency.
   * IPC        - The corrected IPC count rate in the broad band (0.2 - 3.5 keV),
                  which may differ slightly from the value in the standard Rev 1B
                  processing.
   * IPCDEEP    - The IPC count rate in the broad band (0.16-3.5 keV), corrected
                  for source photons which fall outside the detect cell,
                  vignetting, background, and large angle scattering intrinsic
                  to the HEAO-2 mirror. (See the help file for the IPCDEEP
                  database for more details).
   * IPCOSTARS  - The corrected IPC count rate or upper limit thereof, in the
                  broad band (0.2-3.5 keV). To determine whether this is a
                  detection or upper limit, go to the IPCOSTARS database: if
                  count_rate_flag = 1 for a source, the listed value is an upper
                  bound and not a detection.
   * IPCSLEW    - The IPC count rate in all 15 PI bins of the detector.
   * LMCXRAY    - The IPC count rate in the broad-band of 0.16 to 3.5 keV.
   * SMCXRAY    - The IPC count rate in the broad-band of 0.16 to 3.5 keV.
   * IPCULTSOFT - The background-subtracted count rate of the X-ray source in
                  the 0.2 to 4.0 keV passband in units of ct/s. The
                  counts for each source were extracted within a circular region
                  of 3 arcmins radius centered on the source's catalog position.
   * EXSS       - The IPC photon ct/s for the aperture 1
                  (1.25 arcmin radius) detection.
   * EINOPSLGAL - The Einstein IPC (X-ray) count rate measured for the galaxy,
                  in ct/s. This count rate has been corrected only for dead-time
                  and background.
   * EINGALCAT  - The background-subtracted Einstein X-ray count rate, in ct/s.
   * EINGALCLUS - The Einstein IPC (X-ray) count rate, in ct/s, in the 0.5-4.5keV
                  energy band (IPC PI channels 4-11) within a fixed linear
                  aperture selected, if possible, to be a 1 Mpc radius (with an
                  assumed Hubble Constant of 50 km/s/Mpc). This count rate value
                  has been background subtracted and vignetting corrected. and
                  background.

   * CMA        - The average LE count rate in the 0.05-2.0 keV energy range.
   * EXOHGLS    - The average LE count rate in the 0.05-2.0 keV energy range.

   * RASSBSC    - The PSPC count rate corrected for vignetting in the energy band
                  from 0.1 - 2.4 keV.
   * WGACAT     - The background-subtracted PSPC count rate corrected for the
                  telescope vignetting and point spread function. The counts are
                  accumulated from PI bins 24 to 224 (0.24-2.0 keV).
   * RBS        - The RASS count rate in the total ROSAT PSPC bandpass
                  (0.1 - 2.4 keV), in ct/s.
   * LMCHRIXRAY - The net HRI count rate, in ct/s. The count rate
                  from the observation in which the positional error of the source
                  was the smallest, is adopted.
   * SMCROSXRY2 - The PSPC 0.1-2.4 keV count rate, in ct/s.
   * ROSPSPC    - The source count rate from ML or MDETEC algorithms (ct/s).
   * ROSPSPCF   - The source count rate from ML or MDETEC algorithms (ct/s).
   * RASSHGSOFT - The mean PSPC count-rate in ct/s as measured during the RASS,
                  and as quoted in the RASS BSC.
   * RASSHGSFT2 - The mean PSPC count-rate in ct/s, as taken from the RASS BSC
                  for most sources. In a few cases, it comes from the RASS FSC
                  or is derived from small photon event tables (PETs) extracted
                  from the RASS.
   * RASSFSC    - The vignetting-corrected source count rate in the broad energy
                  band (pulse height amplitude (PHA) channels 11 - 235), in ct/s.
   * CHASFRXRAY - The ROSAT PSPC count rate in ct/s.
   * LMCROSXRAY - The PSPC 0.1-2.4 keV count rate, in ct/s.
   * SMCROSXRAY - The PSPC count rate in the 0.1-2.4 keV energy range, in ct/s.
   * RASSCNS3   - The mean PSPC count rate, in ct/s.
   * ROSATHARD - The hard-band PSPC count rate in the 0.9 - 2.0 keV band, in
                  ct/s, calulcated by dividing the number of counts in PSPC
                  channels 91 - 201 within the source extraction circle by the
                  ROSAT PSPC exposure time (in s) after good-time screening.
   * ROSHRI     - The mean ROSAT HRI count rate, in ct/s.
   * ROSNEPAGN  - The count rate in the 0.1-2.4keV range, in ct/s.
   * ROSNEPXRAY - The PSPC count rate in the 0.1-2.4keV range, in ct/s, corrected
                  for vignetting.
   * ORIONXRAY  - The corrected ROSAT HRI count rate in ct/s.
   * RASSWD     - The PSPC count rate in the 0.1-0.28 keV band.
   * RASSOB     - The mean PSPC count rate in ct/s.
   * M31ROSXRAY - The count rate in the broad-band (0.1-2.4 keV), in ct/s.
   * RASS6DFGS  - The RASS X-ray source count rate (0.1-2.4 keV), in ct/s.
   * RASSBSCPGC - The RASS-BSC X-ray source count rate (0.1-2.4 keV), in ct/s.
   * RASSDSSAGN - The RASS X-ray source count rate (0.1-2.4 keV), in ct/s,
                  corrected for vignetting.
   * RASSDSSTAR - The RASS X-ray source count rate (0.1-2.4 keV), in ct/s,
                  corrected for vignetting.
   * RASSDWARF  - The mean PSPC count rate in ct/s.
   * RASSEBCS   - The final PSPC count rate in ct/s. Based on the original VTP
                  count rate in PHA channels 11 to 235. Statistical corrections
                  for low-surface-brightness emission that was not directly
                  detected and for contamination from point sources have been
                  applied.
   * RASSGIANT  - The mean PSPC count rate in ct/s.
   * REFLEX     - The uncorrected cluster count rate, in ct/s, as
                  measured with the GCA method and for the specfied aperture size.
   * DXRBS      - The observed ROSAT PSPC count rate for the source, in ct/s.
   * PLEIADXRAY - The mean PSPC count rate of the X-ray source in counts per
                  second (converted by the HEASARC from the units of ct/ks in the
                  original table).
   * HRASSCAT   - The RASS PSPC count rate, in ct/s.
   * NORAS      - The RASS PSPC count rate, in ct/s.
   * BHRFSCID   - The ROSAT-FSC count rate, in ct/s.
   * RASS2MASS  - The RASS/BSC count rate, in ct/s.
   * RASSUSNOID - The RASS/BSC count rate, in ct/s.
   * CMAR1XRAY  - The ROSAT count rate, in ct/s.
   * RASSASASEB - The RASS count rate, in ct/s.
   * WARPS      - The corrected total count rate as obtained from the Voronoi
                  Tessellation and Percolation (VTP) algorithm, in ct/s.

   * ASCAGIS    - The 0.7-7.0 keV count rate corrected for vignetting (but not
                  for galactic interstellar absorption), in ct/s.
   * ASCASIS    - The estimated total broad-band count rate in front of the
                  telescope.
   * ASCAGPS    - The count rate observed at the GIS nominal position in the
                  0.7-7.0 keV energy band as obtained from image fitting analysis,
                  in ct/s/GIS.
   * ASCALSS    - The GIS count rate observed at the GIS reference position in
                  the 0.7-7.0 keV energy band and with an extraction radius of
                  6 arcminutes, in ct/s.
   * ASCAEGCLUS - The X-ray count rate, in ct/s/GIS.
   * TARTARUS   - The combined SIS/GIS count rate in the 0.5-10.0 keV energy
                  range.

   * BMWCHANCAT - The total-band (0.5-7.0 keV) count rate, in ct/s.
   * CARINACXO  - The 0.5-8.0 keV net count rate (from merging observations),
                  in ct/s, calculated by dividing the counts in this band by
                  the effective exposure time.
   * CHANDFN2MS - The 0.5-8.0 keV ACIS count rate (corrected for vignetting),
                  in ct/s, calculated by dividing the counts in this band by
                  the effective exposure time.
   * CHANDFS1MS - The 0.5-2 keV keV ACIS count rate (corrected for vignetting),
                  in ct/s.
   * CHANDFS2MS - The net full band (0.5-8.0 keV) count rate, in ct/s, calculated
                  by dividing the full-band counts by the effective exposure time.
                  in ct/s. (Not corrected for vignetting.)
   * CHANDFS4MS - The net full band (0.5-8.0 keV) count rate, in ct/s, calculated
                  by dividing the full-band counts by the effective exposure time.
                  in ct/s. (Not corrected for vignetting.)
   * CLANS      - The net full band (0.5-8.0 keV) count rate, in ct/s, calculated
                  by dividing the full-band counts by the effective exposure time.
   * CLASXS     - The net full band (0.4-8.0 keV) count rate, in ct/s.
   * M31CXOXRAY - The count rate (corrected for exposure, background variation,
                  and instrumental point spread function), in ct/s, determined
                  via aperture photometry.
   * CHANEXTDFS - The net full band (0.5-8.0 keV) count rate, in ct/s, calculated
                  by dividing the full-band counts by the effective exposure time.
   * XBOOTES    - The full-band (0.5 - 7 keV) count rate, in ct/s, calculated
                  by dividing the full-band counts by the effective exposure time.
   * COUP       - The full-band (0.5 - 8 keV) count rate, in ct/s, calculated
                  by dividing the full-band net or background-corrected counts by
                  the product of the effective exposure time and the fraction of
                  the PSF at the fiducial energy of 1.497 keV enclosed within the
                  extracted area.
   * CHAMPPSC   - The net full-band (0.5 - 8 keV) count rate, in ct/s, calculated
                  by dividing the full-band net (background-corrected) counts by
                  the mean effective, vignetting-corrected exposure time.
   * CHAMPSDDSA - The net full-band (0.5 - 8 keV) count rate, in ct/s, calculated
                  by dividing the net (background-corrected) counts by
                  the effective, vignetting-corrected exposure time.
   * CHANTYPGPR - The normalized total-band (0.5 - 8 keV) count rate, in ct/s.
   * IC1396NCXO - The full-band (0.5 - 8 keV) count rate, in ct/s, calculated
                  by dividing the full-band counts by the effective exposure time.
   * IC348CXO   - The exposure-time-corrected X-ray source count rate in the
                  0.2 - 8.0 keV ACIS energy band, in ct/s.
   * IC348CXO2  - The net extracted total (0.5 - 8 keV) band count rate of the
                  X-ray source, in ct/s, calculated by dividing the net extracted
                  counts by the effective exposure time.
   * TRIFIDCXO  - The net count rate in the 0.5 - 8.0 keV band of the X-ray
                  source, in ct/s, derived from wavelet analysis.
   * M17CXO     - The net extracted total (0.5 - 8 keV) band count rate of the
                  X-ray source, in ct/s, calculated by dividing the net extracted
                  counts by the effective exposure time.
   * M67CXO     - The net, background-corrected, 0.3-7.0keV count rate, in ct/s.
   * M81CXO     - The aperture-corrected X-ray source count rate in the ~0.2 to
                  8.0 keV band, in ct/s.
   * M87CXO     - The background-corrected X-ray count rate in the 0.3 to 10 keV
                  band, in ct/s.
   * MONR2CXO   - The approximate, non-vignetting-corrected, 0.5 - 10.0keV count
                  rate, in ct/s, computed by dividing the net counts by the
                  effective exposure, 100 ksec, for all sources.
   * NGC1291CXO - The net extracted total (0.5 - 8 keV) band count rate of the
                  X-ray source, in ct/s, calculated by dividing the net extracted
                  counts by the effective exposure time.
   * NGC1333CXO - The average X-ray source count rate CR, in ct/s, as given by
                  CR = (C_xtr - B_xtr)/(f_PSF * E_net), where C_xtr are the source
                  counts, B_xtr the background counts, f_PSF the fraction of the
                  total counts extracted from the source extraction region
                  (typically ~0.9) and E_net = 37800 s is the effective exposure
                  time.
   * NGC1893CXO - The estimated net extracted total (0.5 - 8 keV) band count rate
                  of the X-ray source, in ct/s, calculated by dividing the net
                  extracted counts by the effective exposure time.
   * NGC2237CXO - The estimated net extracted total (0.5 - 8 keV) band count rate
                  of the X-ray source, in ct/s, calculated by dividing the net
                  extracted counts by the effective exposure time.
   * NGC2244CXO - The estimated net extracted total (0.5 - 8 keV) band count rate
                  of the X-ray source, in ct/s, calculated by dividing the net
                  extracted counts by the effective exposure time.
   * NGC2264CXO - The net background- and vignetting-corrected count rate, in
                  counts per second.
   * NGC2362CXO - The count rate of the X-ray source, in ct/s, assumed by the
                  HEASARC to be in the 0.3 - 8.0 keV energy range, although this
                  needs to be confirmed.
   * NGC2403CXO - The ASIC-S3 count rate (0.5 - 2.0 keV) of the X-ray source, in
                  ct/s.
   * NGC4649CXO - The count rate (0.3 - 10 keV) of the X-ray source, in ct/s.
   * NGC6357CXO - The X-ray (0.5 - 8 keV) count rate, in ct/s, calculated by
                  dividing the estimated counts by the effective exposure time.
   * NGC6530CXO - The count rate of the X-ray source in the energy range from
                  0.3 - 8.0 keV, in ct/s, as measured using PWDetect, a
                  wavelet-based source detection algorithm.
   * NGC752CXO  - The X-ray (0.5 - 2.0 keV) source count rate, in ct/s.
   * ORIONFFCXO - The net background- and vignetting-subtracted count rate of
                  the X-ray source in ct/s.
   * ONCCXOXRAY - The net background- and vignetting-subtracted count rate of
                  the X-ray source in ct/s, computed by dividing the net source
                  counts by the Chandra effective exposure time.
   * GC47TUCCXO - The 0.5 - 4.5 keV band count rate of the X-ray source, in ct/s,
                  calculated by dividing the background-subtracted counts by the
                  exposure time.
   * ARCQUINCXO - The on-axis X-ray source broad-band (1 - 9 keV) count rate,
                  in ct/s.
   * RCW49CXO   - The X-ray (0.5 - 8 keV) count rate, in ct/s, calculated by
                  dividing the estimated counts by the effective exposure time.
   * M33CHASE   - The X-ray (0.35 - 8 keV) count rate, in ct/s, calculated by
                  dividing the net counts by the total exposure time.
   * CYGOB2CXO  - The X-ray (0.5 - 8 keV) count rate, in ct/s, calculated as the
                  ratio of the source photons in total band (corrected for the
                  PSF fraction outside the extraction box) to the exposure time.
   * CYGOB2CXO2 - The X-ray (0.5 - 8 keV) count rate, in ct/s.
   * WD1CXO     - The X-ray (0.5 - 8 keV) count rate, in ct/s, calculated as the
                  ratio of the source photons in the total band to the exposure
                  time. It does not include the ARF correction, and, hence,
                  for some sources, will be an underestimate of the true count
                  rate.
   * GALCENCXO  - The hard-band X-ray (2 - 8 keV) count rate, in ct/s, calculated
                  by dividing the net counts in the source region by the
                  effective exposure time.
   * SDSSCXOQSO - The X-ray (0.3 - 8 keV) count rate, in ct/s, calculated
                  by dividing the net counts in the source region by the
                  vignetting-corrected exposure time.
   * ECDFSCXO   - The net full-band (0.5 - 8.0 keV) count rate, in ct/s.
   * ROSETTECXO - The estimated X-ray (0.5 - 8.0 keV) count rate, calculated
                  by dividing the net counts in the source region by the
                  effective exposure time.
   * CCOSMOSCAT - The effective full-band (0.5 - 7.0 keV) count rate, in ct/s.
   * SSA22CXO   - The net background-subtracted full-band (0.5 - 8.0 keV) count
                  rate, in ct/s.
   * SWIRELHCXO - The net 0.3 - 8.0 keV count rate of the X-ray source, in ct/s.
   * SMCDFSCXO  - The net full-band (0.5 - 8.0 keV) count rate, in ct/s.
   * CG12CXO    - The net full band (0.5 - 8.0 keV) count rate, in ct/s,
                  calculated by dividing the full-band counts by the effective
                  exposure time.
   * W40SFRCXO  - The net full band (0.5 - 8.0 keV) count rate, in ct/s,
                  calculated by dividing the full-band counts by the effective
                  exposure time.
   * S254258CXO - The net full band (0.5 - 8.0 keV) count rate, in ct/s,
                  calculated by dividing the full-band counts by the effective
                  exposure time.

   * SWSDSSQSO  - The Swift/XRT count rate of the X-ray source, in ct/s.

   * XMMSSC     - The full-band count rate (0.2 - 12 keV) of the combined EPIC
                  detection, in ct/s.
   * XMMGPS     - The broad-band count rate (0.4 - 6.0 keV) of the EPIC PN
                  detection, in ct/s.
   * M31XMMXRAY - The combined EPIC PN, MOS1, and MOS2 count rate, in ct/s, in
                  the XID band corresponding to the 0.2-4.5 keV energy range.
   * M33XMMXRAY - The combined EPIC PN, MOS1, and MOS2 count rate, in ct/s, in
                  the XID band corresponding to the 0.2-4.5 keV energy range.
   * XMMSLEWCLN - The full-band count rate (0.2 - 12 keV), in ct/s.
   * XMMBSS     - The source count rate in the 0.5 - 4.5 keV energy band, in ct/s.
   * NGC2547XMM - The PN count rate of the X-ray source in the total band
                  (0.3 - 3 keV), in ct/s.
   * LUPUS3XMM  - The PN count rate of the X-ray source in the 0.5 - 4.5 keV
                  band, in ct/s.
   * NGC2808XMM - The net (background- and vignetting-corrected) 0.5 - 10 keV
                  count rate of the X-ray source, in ct/s.
   * NGC6231XMM - The PN count rate of the X-ray source in the 0.5 - 10.0 keV
                  band, in ct/s.
   * NGC6530XMM - The vignetting- and background-corrected PN count rate of the
                  X-ray source in the 0.5 - 1.2 keV band, in ct/s.
   * NGC752XMM  - The XMM-Newton X-ray source EPIC (PN+MOS1+MOS2) count rate of
                  the X-ray source, in ct/s. The HEASARC believes the energy range
                  to be 0.5 - 2.0 keV.
   * UPPRSCOXMM - The equivalent on-axis EPIC pn count rate, in ct/s, i.e., the
                  count rate that would be observed if the source was located on
                  the telescope axis.
   * SIGORIXMM  - The MOS-equivalent count rate of the X-ray source, in ct/s,
                  derived from the source detection algorithm run on the summed
                  MOS1+MOS2+PN dataset in the 0.3-7.8 keV energy band.
   * NGC2516XMM - The MOS1-equivalent count rate of the X-ray source, in ct/s.
   * OMEGCENXMM - The 0.5 - 5.0 keV band count rate of the X-ray source, in ct/s.
   * CEPAXMM    - The 1 - 10 keV band count rate of the X-ray source, in ct/s.
   * TAURUSXMM  - The PN-equivalent source count rate CR_F, in ct/s, in the
                  mosaicked EPIC full-band (0.5 - 7.3 keV) image.
   * AXIS       - The source count rate in the XID (0.5 - 4.5 keV) band, in ct/s.
   * NGC2264XMM - Either the EPIC PN or the EPIC MOS count rate of the X-ray
                  source, in ct/s. (Refer to the associated flag field in the
                  original table.)
   * XMMLSS     - The EPIC PN count rate of the X-ray source, in ct/s, in the
                  2-10 keV energy band.
   * CARINAXMM  - The EPIC PN count rate of the X-ray source, in ct/s, in the
                  whole PN energy band, 0.4 - 10 keV.
   * LOCKMANXM2 - The X-ray source count rate in the 0.5 - 10.0 keV energy
                  band, in ct/s. This is the combined all-EPIC point source
                  count rate, corrected for telescope vignetting and for the
                  fraction of counts outside the source extraction region.
   * ELAISS1XMM - The full-band (0.5-10 keV) background-subtracted count rate of
                  the XMM-Newton X-ray source, in ct/s. The exposure times used
                  to calculate the count rates were obtained from the
                  corresponding exposure maps, and thus take into account all
                  spatial non-uniformities due to vignetting, chip geometry,
                  and CCD gaps.
   * SXDSCAT    - The sum of the medium (2 - 4.5 keV) band and ultrahard (4.5 -
                  10 keV) band vignetting-corrected count rates, in ct/s.
   * XMMCOSMOS  - The hard-band X-ray (2 - 10 keV) count rate, in ct/s, calculated
                  by dividing the hard-band counts in the source region by the
                  vignetting-corrected hard-band exposure time.
   * SDSSXMMQSO - The X-ray (0.5 - 10 keV, presumably) count rate, in ct/s,
                  calculated by dividing the net counts in the source region by
                  the "live" exposure time of the XMM-Newton observation.
   * XMMOBSTARS - The count rate of the X-ray source in the 0.5 - 4.5 keV (XID)
                  energy range, in ct/s, as measured by the EPIC-MOS1 camera (for
                  counts with patterns 0-4 for the pn and 0-12 for the MOS
                  cameras).
   * COLL69XMM  - The broad-band count rate of the X-ray source in the 0.5 -
                  7.3 keV energy range, in ct/s.
   * M101XMM    - The X-ray source count rate in the hard (2 - 6 keV) band for
                  the PN camera, in ct/s.
   * IC10XMMCXO - The on-axis source broad-band count rate, in ct/s, being the
                  sum of the exposure-corrected count rates in the 4 energy bands
                  (which are defined differently from the XMM-Newton PN and
                  Chandra ACIS instruments, notice).
   * M31DEEPXMM - The combined EPIC pn, MOS1 and MOS2 count rate of the
                  XMM-Newton source in the 0.2 - 4.5 keV (XID) band, in ct/s.
   * LAMORIXMM  - The MOS-equivalent count rate of the X-ray source in the 0.3 -
                  7.8 keV energy band, in ct/s.
   * CYGOB2XMM  - The combined EPIC pn count rates of the XMM-Newton source in
                  the 0.5 - 8.0 keVband, in ct/s.

   * XTEASSCAT  - The source count rate in the 3 - 8 keV energy band, in
                  ct/s/PCU (Proportional Counter Unit).

Count_Rate_Error
The error in the X-ray count rate in ct/s.

Error_Radius
The radius of the 90-percent confidence error circle, in arcseconds. For the XMMSSC database, we have added the statistical and systematic position errors (which are given separately in that table) in quadrature in order to obtain the quoted value. For database tables for which this information is not explicitly given, the following estimates for the positional uncertainty can be made: (i) for Einstein IPC databases, a value of about 60 arc seconds should be approximately correct, except for the IPCSLEW database for which the authors (Elvis et al.) estimate 72 arc seconds; (ii) for the ASCASIS database, Eric Gotthelf estimates a typical value of 40 arc seconds, (iii) for the ROSPSPC and ROSHRI databases, the typical values are 10 - 30 and 4 - 10 arcseconds, respectively, with the larger uncertainties for sources which were detected at the edges of the fields of view, and (iv) for the XRBCAT and the HEAO 1 databases, the positions are only very approximate and should, in general, only be assumed to be accurate to the order of a degree, although some individual entries from these tables are much more accurate than this value.

Flux
The X-ray flux in a characteristic bandpass in units of erg/cm2/s. This quantity is usually obtained by multiplying the given count rate by a conversion factor. Only a few of the constituent databases currently have values for this parameter populated. The characteristic bandpasses for the fluxes in such databases are as follows: 

   * AEGISX     - 0.5 - 10.0 keV, uncorrected, observed frame
   * AGNSDSSXMM - 2.0 - 8.0 keV
   * AGNSDSSXM2 - 0.2 - 12.0 keV (XMM-Newton Band 8)
   * ASCAEGCLUS - 0.5 - 10.0 keV, in the observer's frame
   * ASCAGIS    - 0.7 - 7 keV, corrected for galactic interstellar absorption
                  and using a best-fit power-law spectral model
   * ASCAGPS    - 0.7 - 7 keV, corrected for galactic interstellar absorption
                  and using a best-fit power-law spectral model
   * ASCALSS    - 0.7 - 7 keV, corrected for galactic interstellar absorption
                  and using a best-fit power-law spectral model
   * AXIS       - 0.5 - 10 keV
   * BAXGALCLUS - 0.1 - 2.4 keV, calculated assuming the full Galactic column
                  density; i.e., the value adopted is the one that is appropriate
                  for extragalactic sources
   * BMWCHANCAT - 0.5 - 7.0 keV, the total-band flux of the source, in
                  erg/s/cm2, calculated from the total-band count rate using a
                  fixed conversion factor COR_FAC0 of 1.0E-11 erg/cm2/ct
   * CAIXA      - 2.0 - 10.0 keV
   * CARINACXO  - 0.5 - 8.0 keV
   * CCOSMOSCAT - 0.5 - 10.0 keV, calculated by converting the effective
                  full-band count rate using the formula: F = CR/(CF*1011),
                  where CF is the energy conversion factor,
                  0.742 counts erg-1 cm2
   * CCOSRSSFAG - 2.0 - 10.0 keV, computed using a spectral index (Gamma) of
                  2.1 for candidate SF galaxies and 1.4 value for AGN
                  candidates (NOTE: flux upper limits have been included for this
                  table; refer to the original table for clarification)
   * CDFSAGNCXO - 2.0 - 10.0 keV
   * CHAMPHXAGN - 2.0 - 8.0 keV, corrected for Galactic absorption in the observed
                  frame
   * CHAMPLANE  - 0.5 - 2.0 keV, unabsorbed, calculated using the expression:
                  10.0^(f_x/f_R - (0.4 * R-magnitude) - 5.765)
   * CHAMPLANEX - 2.0 - 8.0 keV, unabsorbed, calculated using a simple power law
                  plus 6.6 keV Fe emission line (PL + Fe) spectral model using
                  quantile analysis
   * CHAMPPSC   - 0.5 - 8.0 keV, assuming an X-ray power-law spectrum with a
                  photon index gamma = 1.4
   * CHAMPSDDSA - 0.5 - 8.0 keV
   * CHANDFN2MS - 0.5 - 8.0 keV, in the observed-frame, corrected for vignetting
                  and the continuous ACIS quantum efficiency degradation, but not
                  corrected for absorption by the Galaxy or intrinsic to the source
   * CHANDFS1MS - 0.5 - 2 keV, calculated from the net count rate (obtained by
                  dividing the net counts by the effective exposure time, which
                  includes the effect of vignetting) and using the conversion
                  factor appropriate for the measured average spectrum of all the
                  sources, Gamma = 1.375 +/- 0.015
   * CHANDFS2MS - 0.5 - 8.0 keV
   * CHANDFS4MS - 0.5 - 8.0 keV, in observed-frame, not corrected for Galactic
                  or intrinsic absorption
   * CHANEXTDFS - 0.5 - 8.0 keV, not corrected for Galactic or intrinsic absorption
   * CHANNSGPSC - 0.3 - 8.0 keV, using the first of two possible Chandra
                  observations
   * CHANSEXSI  - 2.0 - 10 keV
   * CHANTYPGPR - 2.0 - 10 keV
   * CHESSCAT   - 0.3 - 8.0 keV
   * CHNGPSCLIU - 0.3 - 8.0 keV, the average of all detections, as calculated using
                  the count rate
   * CLANS      - 0.5 - 8.0 keV
   * CLASXS     - 0.4 - 8.0 keV
   * CYDER      - 2.0 - 8.0 keV
   * DXRBS      - 0.1 - 2.0 keV, not corrected for Galactic absorption and using a
                  conversion factor that was derived from the ROSAT PSPC count
                  rate using the observed hardness ratio and an assumed Galactic
                  hydrogen column density
   * ECDFSCXO   - 0.5 - 8.0 keV
   * EINGALCAT  - 0.2 - 4.0 keV
   * ELAISCXO   - 0.5 - 8.0 keV
   * ELAISS1XMM - 0.5 - 10.0 keV
   * EMSS       - 0.3 - 3.5 keV
   * EROSXMM    - 2 - 10 keV
   * GCPTSRCCXO - 2 - 10 keV
   * GWSSTRPCXO - 0.5 - 10 keV
   * HPERSEICXO - 0.3 - 8.0 keV, presumably
   * IC348CXO2  - 0.5 - 8.0 keV, presumably
   * IPCDEEP    - 0.16 - 3.5 keV
   * LALABOOCXO - 0.5 - 10.0 keV, Galactic absorption-corrected
   * LALACETCXO - 0.5 - 10.0 keV, Galactic absorption-corrected
   * LKHA101CXO - 0.3 - 8.0 keV, unabsorbed flux as derived from the best-fit
                  spectral model and the estimated absorbing column density
   * LOCKMANXMM - 2.0 - 10.0 keV
   * LOCKMANXM2 - 0.5 - 10.0 keV
   * M101CXO    - 2.0 - 8.0 keV
   * M101XMM    - 0.3 - 6.0 keV, were obtained by summing the fluxes over the
                  three sub-bands and then taking the weighted mean of the
                  individual PN and MOS measurements
   * M31DEEPXMM - 0.2 - 4.5 keV
   * M31ROSXRAY - 0.2 - 4.0 keV, applying the spectral model of TF (thermal
                  bremsstrahlung with kT=5 keV and NH=7x1020 cm-2)
   * M31XMMXRAY - 0.2 - 4.5 keV, based on combined EPIC PN, MOS1, and MOS2 data
   * M33CXOXRAY - 0.3 - 8.0 keV
   * M33XMMXRAY - 0.2 - 4.5 keV, based on combined EPIC PN, MOS1, and MOS2 data
   * M33XMM2    - 0.2 - 4.5 keV, the maximum EPIC flux of the X-ray source in
                  the different observations in the XID band, calculated from the
                  vignetting-corrected count rate using the energy conversion
                  factors for the PN and MOS medium, thin and thick filter,
                  obtained by W3PIMMS, taking 100% of the source counts and
                  assuming a power-law spectrum with a photon index of 1.7
                  absorbed by the Galactic foreground column of 6 x 1020 cm-2
   * NGC2024CXO - 0.5 - 7.0 keV
   * NGC2264CXO - 0.3 - 8.0 keV
   * NGC2264CX2 - 0.5 - 7.0 keV
   * NGC2516CXO - 0.1 - 4.0 keV, computed for an assumed distance of 387 pc
   * NGC2516XMM - 0.3 - 7.9 keV
   * NGC2808CXO - 0.5 - 8.0 keV, unabsorbed
   * NGC2808XMM - 0.5 - 10.0 keV; the authors calculated the unabsorbed flux
                  from the count rate using energy conversion factors (ECFs)
   * NGC4472CXO - 2.0 - 8.0 keV, based on model
   * NORAS      - see below for more information
   * OMC2P3CXO  - see below for more information
   * OMEGCENCXO - 0.5 - 2.5 keV, as derived from the medium-band counts values
                  using WebPIMMS
   * ORIONFFCXO - 0.3 - 8.0 keV; the authors used the X-ray fluxes of the bright
                  sources obtained from a spectral analysis using 2-T absorbed
                  XSMEKAL thermal emission models to compute X-ray flux-weighted
                  conversion factors between count rates and X-ray fluxes for all
                  of the sources in each field
   * PLEIADXRAY - 0.16 - 4.0 keV, computed for an assumed distance of 127 pc
   * RASS6DFGS  - 0.1 - 2.4 keV, the unabsorbed RASS flux, calculated from the
                  HEASARC PIMMS tool using a fixed photon index of 1.7 and the
                  Galactic Hydrogen column density
   * RASSBSCPGC - 0.1 - 2.4 keV, calculated from the logarithm of the flux
   * RASSCNS3   - 0.1 - 2.4 keV, using an energy conversion factor (ECF) to
                  convert the count rate in this bandpass to an X-ray flux
                  calculated using the formula ECF = (5.30 x HR + 8.31) x
                  10-12 erg/cm2/ct
   * RASSDSSAGN - 0.1 - 2.4 keV, corrected for absorption within the Galaxy
   * RASSDSSTAR - 0.1 - 2.4 keV, calculated from the count rate (CR) using the
                  formula: flux = CR * ECF, where ECF is 1.0 x 10-11 erg/cm2/ct
   * RASSDWARF  - 0.1 - 2.4 keV, calculated from the count rate (CR) using the
                  formula: flux = CR * ECF, where ECF is an individual
                  energy-conversion factor based on the hardness ratio (HR) of the
                  source given by ECF = (5.30 x HR + 8.31) x 10-12 erg/cm2/ct
   * RASSEBCS   - 0.1 - 2.4 keV
   * RASSFIRST  - 0.1 - 2.4 keV, obtained from the measured count rates by
                  assuming an average photon index of Gamma = 2.2 for the
                  underlying X-ray spectrum and the Galactic absorption
   * RASSGIANT  - 0.1 - 2.4 keV
   * RBS        - 0.5 - 2.0 keV, assuming a power-law spectrum with a photon
                  index of 2
   * RBSCNVSS   - 0.1 - 2.4 keV
   * RCW108CXO  - 0.3 - 8.0 keV, absorption-corrected, derived from the best-fit
                  spectral model
   * RCW38CXO2  - 0.3 - 8.0 keV, total unabsorbed (absorption-corrected)
   * RCW49CXO   - 0.5 - 8.0 keV, estimated
   * REFLEX     - 0.1 - 2.4 keV, corrected for column density, X-ray temperature,
                  and K-Correction effects
   * RIXOS      - 0.5 - 2.0 keV
   * RHOOPHCXO  - 0.5 - 9.0 keV
   * ROS13HRXMM - 0.2 - 10.0 keV, obtained from the sum of the individual band
                  fluxes
   * ROS400GCLS - 0.5 - 2.0 keV, total unabsorbed X-ray flux
   * ROSATHARD  - 0.5 - 2.0 keV
   * ROSATRLQ   - 0.1 - 2.4 keV, assuming a power-law spectrum and unabsorbed,
                  i.e., the flux which would have been measured without any
                  interstellar absorption
   * ROSATRQQ   - 0.1 - 2.4 keV, assuming a power-law spectrum and unabsorbed,
                  i.e., the flux which would have been measured without any
                  interstellar absorption
   * ROSGALCLUS - 0.5 - 2 keV, total unabsorbed X-ray flux in the observer frame
   * ROSNEPAGN  - 0.5 - 2 keV, total unabsorbed X-ray flux in the rest frame
   * ROSNEPXRAY - 0.5 - 2 keV, total unabsorbed X-ray flux
   * ROXA       - 0.1 - 2.4 keV, ROSAT All-Sky Survey X-ray flux
   * SA57XMM    - 0.5 - 10 keV
   * SAX2TO10   - 2 - 10 keV, calculated assuming a power-law spectrum with an
                  energy index of 0.7
   * SAXWFCCAT  - 2 - 10 keV, flux-weighted mean of the unabsorbed flux from all
                  detections of the X-ray source
   * SAXWFCCAT2 - 3 - 17 keV, roughly converted from mCrab to cgs units using the
                  multiplicative factor 2.0E-11
   * SDSSCXOQSO - 0.5 - 8 keV, from Chandra
   * SDSSXMMQSO - 2 - 10 keV, in the observed frame
   * SFGALHMXB  - 0.5 - 8 keV, calculated from the logarithm of the flux
   * SMCDFSCXO  - 0.5 - 8 keV
   * SMCWINGCXO - 0.5 - 8 keV, from Chandra
   * SPICESCXO  - 2 - 10 keV, from Chandra
   * SSA22CXO   - the observed-frame Chandra flux of the X-ray source in the
                  full band (0.5 - 8 keV); quoted fluxes have been computed
                  using the counts and the corresponding exposure time and
                  spectral slope
   * SWIRECXO   - 0.5 - 8 keV, from Chandra
   * SWIRELHCXO - 0.3 - 8 keV, calculated from the count rate (CR) using the
                  formula: flux = CR * ECF, where ECF is the energy conversion
                  factor determined using a single power-law model
   * SWSDSSQSO  - the unabsorbed 0.3 - 10 keV Swift/XRT flux
   * TARTARUS   - 2 - 10 keV (excluding 5 - 7.5 keV), the SIS0 flux of the
                  best-fitting absorbed power-law model
   * ULXRBCAT   - variable bandpass, see below for more information
   * UPPRSCOXMM - 0.5 - 8.0 keV
   * WARPS      - 0.5 - 2.0 keV
   * WARPS2     - 0.5 - 2.0 keV
   * WGCAT      - 0.05 - 2.5 keV
   * XBOOTES    - 0.5 - 7 keV
   * XDEEP2     - 0.5 - 7 keV
   * XMDSVVDS4S - 0.5 - 2 keV
   * XMMCFRSCAT - 0.5 - 10 keV
   * XMMCOSMOS  - 2 - 10 keV
   * XMMLSS     - 2 - 10 keV
   * XMMOBSTARS - 0.5 - 10 keV
   * XMMSSC     - 0.2 - 12 keV, for the combined EPIC detection only
   * XMMSSCLWBS - the maximum flux in the 0.2 - 12 keV range
   * XMMSLEWCLN - 0.2 - 12 keV
   * XMMSLEWEGS - 0.2 - 12 keV
   * XMMVARAGN  - 0.5 - 4.5 keV, calculated from the logarithm of the average flux
   * XMS        - 2 - 10 keV
For some catalogs, the flux values have been calculated using the following relation: 
      flux = lx / (1.20E+38 * distance2)
where lx is the X-ray luminosity in erg/s and the distance is in pc. This relation is valid for fairly nearby objects. The following is a list of the catalogs for this relation was used and their respective assumed distances: 
   * CENACXO    - Used the larger of the two X-ray (0.4 - 10 keV) luminosities
                  (ignoring those values flagged as upper limits) and
                  3.5 Mpc for the distance to Centaurus A.
   * CEPBOB3CXO - Used the absorption-corrected, 0.5 - 8.0 keV X-ray luminosity
                  and 725 pc for the distance to the Cepheus B star formation
                  region.
   * CMAR1XRAY  - Used the logarithm of the 0.4 - 2.4 keV X-ray luminosity
                  and 1.0 kpc for the distance to CMa R1.
   * CYGOB2CXO2 - Used the logarithm of the 0.5 - 8.0 keV X-ray luminosity
                  and 1.45 kpc for the distance to Cygnus OB2.
   * CG12CXO    - Used the absorption-corrected, 0.5 - 8 keV X-ray luminosity
                  and 550 pc for the distance to CG 12.
   * CHAINTHCXO - Used the absorption-corrected, 0.5 - 8 keV X-ray luminosity
                  and 160 pc for the distance to the Cha I North cloud.
   * ETGALCXO   - Used the 0.3 - 7 keV X-ray luminosity and the known distance
                  to the specified host galaxy for each source.
   * ETGALXRAY  - Used the pseudo-bolometric X-ray luminosity
                  (ignoring those values flagged as upper limits) and
                  the distance to each galaxy as specified in the table.
   * IC348CXO   - Used the extinction-corrected, 0.2 - 10 keV X-ray luminosity
                  of the source, calculated based on the analysis of the X-ray
                  spectra as described in Section 5 of Preibisch & Zinnecker
                  (2002) and assuming a distance of 310 pc to IC 348.
   * GC47TUCCXO - Used the 0.5 - 6.0 keV X-ray luminosity and 4850 pc for the
                  distance to 47 Tuc.
   * LAMORIXMM  - Used the logarithm of the 0.3 - 8.0 keV X-ray luminosity and
                  400 pc for the distance to Lambda Orionis.
   * M17CXO     - Used the absorption-corrected, 0.5 - 8.0 keV X-ray luminosity
                  and 1600 pc for the distance to M 17.
   * M31CXO2    - Used the 0.5 - 8 keV X-ray luminosity and 780 kpc for the
                  distance to M 31.
   * M31XMM2    - Used the X-ray luminosity derived from the best-fit spectral
                  model for the (first) listed XMM-Newton camera and 760 kpc
                  for the distance to M 31.
   * M33CHASE   - Used the 0.35 - 8 keV X-ray luminosity and 817 kpc for the
                  distance to M 33.
   * M33CXOXRAY - Used the total-band, 0.5 - 8.0 keV X-ray luminosity and
                  0.840 Mpc for the distance to M 33 as given in Grimm
                  et al. (2005).
   * M81CXO     - Used the 0.3 - 8.0 keV X-ray luminosity and 3.6 Mpc for the
                  distance to M 81.
   * M81CXO2    - Used the 0.5 - 8.0 keV X-ray luminosity and 3.63 Mpc for the
                  distance to M 81.
   * M87CXO     - Used the 0.3 - 10.0 keV X-ray luminosity and 16 Mpc for the
                  distance to M 87.
   * NGC1291CXO - Used the total-band 0.5 - 8.0 keV X-ray luminosity, corrected
                  for the estimated interstellar absorption, and a distance to
                  NGC 1291 of 8.9 Mpc.
   * NGC1333CXO - Used the total-band 0.5 - 8.0 keV X-ray luminosity, corrected
                  for the estimated interstellar absorption, and a distance to
                  NGC 1333 of 318 pc.
   * NGC1893CXO - Used the logarithm of the 0.5 - 8.0 keV X-ray luminosity and
                  3600 pc for the distance to NGC 1893.
   * NGC2237CXO - Used the absorption-corrected, 0.5 - 8.0 keV X-ray luminosity
                  and 1400 pc for the distance to NGC 2237.
   * NGC2244CXO - Used the absorption-corrected, 0.5 - 8.0 keV X-ray luminosity
                  and 1400 pc for the distance to NGC 2244.
   * NGC2264XMM - Used the 0.3 - 15 keV X-ray luminosity and 800 pc for the
                  distance to NGC 2264.
   * NGC2403CXO - Used the 0.5 - 2.0 keV X-ray luminosity and 3.2 Mpc for the
                  distance to NGC 2403.
   * NGC2362CXO - Used the 0.2 - 4.0 keV X-ray luminosity and 1500 pc for the
                  distance to NGC 2362.
   * NGC253XMM  - Used the best-fitting X-ray luminosity and 4.0 Mpc for the
                  distance to NGC 253.
   * NGC2547XMM - Used the 0.3 - 3 keV X-ray luminosity and 417 pc for the
                  distance to NGC 2547.
   * NGC4278CXO - Used the 0.3 - 8.0 keV X-ray luminosity and 16.1 Mpc for the
                  distance to NGC 4649.
   * NGC4636CXO - Used the 0.5 - 2.0 keV X-ray luminosity and 15.0 Mpc for the
                  distance to NGC 4636.
   * NGC4649CXO - Used the 0.3 - 10.0 keV X-ray luminosity and 16.8 Mpc for the
                  distance to NGC 4649.
   * OMC2P3CXO  - Used the absorption-corrected, 0.5 - 8.0 keV X-ray luminosity
                  and 450 pc for the distance to OMC-2/OMC-3.
   * ROSETTECXO - Used the absorption-corrected, 2 - 8 keV X-ray luminosity and
                  1400 pc for the distance to Rosette Molecular Cloud.
   * S254258CXO - Used the logarithm of the 0.5 - 8.0 keV X-ray luminosity
                  and 1.6 kpc for the distance to the S254/S258 region.
   * SIGORIXMM  - Used the 0.3 - 8.0 keV X-ray luminosity and 352 pc for the
                  distance to the Sigma Orionis cluster.
   * ULXNGCAT   - Used the unabsorbed 0.3-10.0 keV luminosity of the source and
                  the distance parameter in ULXNGCAT.
   * ULXRBCAT   - The bandpass is variable; refer to the lower_energy and
                  upper_energy parameters in ULXRBCAT. The distance used is also
                  variables and comes from the distance parameter in ULXRBCAT.
   * W40SFRCXO  - Used the intrinsic (absorption-corrected) 0.5 - 8.0 keV X-ray
                  luminosity, as inferred from XSPEC fitting of the observed
                  X-ray spectrum, and 600 pc for the distance to W 40.
For NORAS, the flux values are the final calculated "corrected" X-ray flux values, using the best estimate for the temperature of the source and the redshift of the spectrum but not the estimated missing flux from outside the radius of significant X-ray emission.

Exposure
The exposure time of the observation, in seconds.

Class
The BROWSE object classification, if available.

Observatory
The name of the observatory or mission which originated the entry.

Contact Person

Questions regarding the XRAY database table can be addressed to the HEASARC User Hotline.

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Last Modified: 19-Dec-2012