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SDSSS82CXO - Sloan Digital Sky Survey Stripe 82 Chandra Source Match Catalog

HEASARC
Archive

Overview

This table contains some of the data from the latest release of the Stripe 82 X-ray (82X) survey point-source catalog, which currently covers 31.3 deg2 of the Sloan Digital Sky Survey (SDSS) Stripe 82 Legacy field. In total, 6,181 unique X-ray sources are significantly detected with XMM-Newton (> 5 sigma) and Chandra (> 4.5 sigma). This 31 deg2 catalog release includes data from XMM-Newton cycle AO 13, which approximately doubled the Stripe 82X survey area. The flux limits of the Stripe 82X survey are 8.7 x 10-16 erg s-1 cm-2, 4.7 x 10-15 erg s-1 cm-2, and 2.1 x 10-15 erg s-1 cm^=2^ in the soft (0.5 - 2.0 keV), hard (2 - 10 keV), and full (0.5 - 10 keV) bands, respectively, with approximate half-area survey flux limits of 5.4 x 10-15 erg s-1 cm-2, 2.9 x 10-14 erg s-1 cm-2, and 1.7 x 10-14 erg s-1 cm-2, respectively. The authors matched the X-ray source lists to available multi-wavelength catalogs, including updated matches to the previous release of the Stripe 82X survey; 88% of the sample is matched to a multi-wavelength counterpart. Due to the wide area of Stripe 82X and rich ancillary multi-wavelength data, including coadded SDSS photometry, mid-infrared WISE coverage, near-infrared coverage from UKIDSS and VISTA Hemisphere Survey (VHS), ultraviolet coverage from GALEX, radio coverage from FIRST, and far-infrared coverage from Herschel, as well as existing ~30% optical spectroscopic completeness, this study is beginning to uncover rare objects, such as obscured high-luminosity active galactic nuclei at high redshift. The Stripe 82X point source catalog is a valuable data set for constraining how this population grows and evolves, as well as for studying how they interact with the galaxies in which they live. The authors derive the XMM-Newton number counts distribution and compare it with their previously reported Chandra log N - log S relations and other X-ray surveys.

Throughout this study, the authors adopt a cosmology of H0 = 70 km s-1 Mpc-1, OmegaM = 0.27, and Lambda = 0.73.

The XMM-Newton and Chandra X-ray sources were matched with sources in the SDSS, WISE, UKIDSS, VHS, GALEX, FIRST and Herschel databases using the maximum likelihood estimator (MLE) method, as discussed in detail in Section 4 of the reference paper. This table contains the list of 1,146 Chandra sources detected in the SDSS Stripe 82. A related table SDSSS82XMM contains the list of 5,220 XMM-Newton sources detected in the SDSS Stripe 82.


Catalog Bibcode

2016ApJ...817..172L

References

The 31 Deg2 release of the Stripe 82 X-ray survey: the point source catalog.
    LaMassa S.M., Urry C.M., Cappelluti N., Bohringer H., Comastri A.,
    Glikman E., Richards G., Ananna T., Brusa M., Cardamone C., Chon G.,
    Civano F., Farrah D., Gilfanov M., Green P., Komossa S., Lira P.,
    Makler M., Marchesi S., Pecoraro R., Ranalli P., Salvato M., Schawinski K.,
    Stern D., Treister E., Viero M.
   <Astrophys. J., 817, 172 (2016)>
   =2016ApJ...817..172L    (SIMBAD/NED BibCode)

Provenance

This table was initially created by the HEASARC in April 2014 based on the machine-readable version of the table ('Properties of SDSS Quasars Detected by Chandra') described in Appendix B1 of the reference paper (LaMassa et al. 2013, MNRAS, 436, 3581) which was obtained from the CDS (their catalog J/MNRAS/436/3581/ file chands82.dat). The present version was created by the HEASARC in January 2017 based on CDS Catalog J/ApJ/817/172 file chandra.dat.

Parameters

Source_Number
A unique identification number for each Chandra source in this catalog, the Chandra Source Catalog 'Master Source Identifier', MSID.

Name
The HEASARC has created a source designation for entries in this catalog following the standard precepts from the Dictionary of Nomenclature of Celestial Objects, using the prefix '[LUC2016] CXO' (for LaMassa, Urry, Cappelluti, 2016 Chandra X-ray Observatory source) and the source number.

ObsID
The Chandra observation identification (ObsID) number for the observation in which the source was detected.

RA
The Right Ascension of the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

Dec
The Declination of the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

LII
The Galactic Longitude of the Chandra source.

BII
The Galactic Latitude of the Chandra source.

Error_Radius
The positional uncertainty of the Chandra source position, in arcseconds.

CXO_Nn_Offset
The angular distance from this Chandra source to the nearest other Chandra source, in arcseconds.

XMM_AO10_Flag
This cross-correlation flag parameter is set to 'Y' to indicate that the Chandra source has a counterpart source in the XMM-Newton archival and AO10 sample in the SDSS Stripe 82 XMM-Newton Catalog (the HEASARC SDSSS82XMM table). Otherwise, it is set to 'N'.

XMM_AO10_Source_Number
The record number (rec_no) of the counterpart source in the XMM-Newton archival and AO10 sample in the SDSS Stripe 82 XMM-Newton Catalog (the HEASARC SDSSS82XMM table).

XMM_AO13_Flag
This cross-correlation flag parameter is set to 'Y' to indicate that the Chandra source has a counterpart source in the XMM-Newton AO13 sample of the SDSS Stripe 82 XMM-Newton Catalog (the HEASARC SDSSS82XMM table). Otherwise, it is set to 'N'.

XMM_AO13_Source_Number
The record number (rec_no) of the counterpart source in the XMM-Newton AO13 sample in the SDSS Stripe 82 XMM-Newton Catalog (the HEASARC SDSSS82XMM table).

Lns_Rem_Flag
This flag parameter is set to 'Y' to indicate that the Chandra source was removed from the logN - logS relation presented in the reference paper. Otherwise, it is set to 'N'. The removed objects are targeted sources of observations, and objects that overlap XMM-Newton observations in the field.

SB_Flux_Lower
The lower bound on the soft-band (0.5-2 keV) flux of the Chandra source, in erg cm-2 s-1.

SB_Flux
The soft-band (0.5-2 keV) flux of the Chandra source, in erg cm-2 s-1. The flux is set to null if the source has a significance of < 4.5 sigma in this band. For the Chandra sources, only significant (>= 4.5 sigma) fluxes are reported (see the text of the reference paper for details). Fluxes are converted from count rate assuming a power-law spectrum where the slope Gamma = 2.0.

SB_Flux_Upper
The upper bound on the soft-band (0.5-2 keV) flux of the Chandra source, in erg cm-2 s-1.

SB_Counts
The net source counts detected in the soft band (0.5-2 keV).

HB_Flux_Lower
The lower bound on the hard-band (2-7 keV) flux of the Chandra source, in erg cm-2 s-1.

HB_Flux
The hard-band (2-7 keV) flux of the Chandra source, in erg cm-2 s-1. The flux is set to null if the source has a significance of < 4.5 sigma in this band. For the Chandra sources, only significant (>= 4.5 sigma) fluxes are reported (see the text of the reference paper for details). Fluxes are converted from count rate assuming a power-law spectrum where the slope Gamma = 1.7.

HB_Flux_Upper
The higher bound on the hard-band (2-7 keV) flux of the Chandra source, in erg cm-2 s-1.

HB_Counts
The net source counts detected in the hard band (2-7 keV).

FB_Flux_Lower
The lower bound on the full-band (0.5-7 keV) flux of the Chandra source, in erg cm-2 s-1.

FB_Flux
The full-band (0.5-7 keV) flux of the Chandra source, in erg cm-2 s-1. The flux is set to null if the source has a significance of < 4.5 sigma in this band. For the Chandra sources, only significant (>= 4.5 sigma) fluxes are reported (see the text of the reference paper for details). Fluxes are converted from count rate assuming a power-law spectrum where the slope Gamma = 1.7.

FB_Flux_Upper
The upper bound on the full-band (0.5-7 keV) flux of the Chandra source, in erg cm-2 s-1.

FB_Counts
The net source counts detected in the full band (0.5-7 keV).

Log_SB_Lx
The logarithm of the observed soft-band (0.5-2 keV) X-ray luminosity of the source, in erg s-1. This is given if the source was detected in this band and it redshift is known.

Log_HB_Lx
The logarithm of the observed hard-band (2-7 keV) X-ray luminosity of the source, in erg s-1. This is given if the source was detected in this band and it redshift is known.

Log_FB_Lx
The logarithm of the observed full-band (0.5-7 keV) X-ray luminosity of the source, in erg s-1. This is given if the source was detected in this band and it redshift is known.

SDSS_Rej_Flag
This flag parameter is set to 'Y' to indicate that a SDSS counterpart was found which exceeded the reliability threshold, but the photometry was rejected for failing quality control checks, else is set to 'N'.

SDSS_Object_ID
The SDSS object identification number (ObjID) of the SDSS counterpart to the Chandra source.

SDSS_RA
The Right Ascension of the SDSS counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

SDSS_Dec
The Declination of the SDSS counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

SDSS_CXO_Rel
The reliability from the Maximum Likelihood Estimate (MLE) of the SDSS source match to the Chandra source, using the highest of the u, g, r, i, and z reliability values. The definition of this parameter used for counterpart selection is discussed in Section 4 of the reference paper.

SDSS_CXO_Offset
The angular distance between the Chandra source and its SDSS counterpart, in arcseconds.

SDSS_Coadd_Flag
This flag parameter is set to 'Y' if the SDSS counterpart is found from the Jiang et al. (2014, ApJS, 213, 12) coadded catalog. Otherwise, it is set to 'N' if the SDSS counterpart was identified in the single-epoch DR9 imaging catalog.

Umag
The u magnitude of the SDSS counterpart to the Chandra source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMag value, while the sources from the coadded SDSS catalog have Mag_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Umag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the Chandra source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMagErr value, while the sources from the coadded SDSS catalog have MagErr_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Gmag
The g magnitude of the SDSS counterpart to the Chandra source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMag value, while the sources from the coadded SDSS catalog have Mag_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Gmag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the Chandra source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMagErr value, while the sources from the coadded SDSS catalog have MagErr_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Rmag
The r magnitude of the SDSS counterpart to the Chandra source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMag value, while the sources from the coadded SDSS catalog have Mag_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Rmag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the Chandra source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMagErr value, while the sources from the coadded SDSS catalog have MagErr_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Imag
The i magnitude of the SDSS counterpart to the Chandra source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMag value, while the sources from the coadded SDSS catalog have Mag_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Imag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the Chandra source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMagErr value, while the sources from the coadded SDSS catalog have MagErr_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Zmag
The z magnitude of the SDSS counterpart to the Chandra source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMag value, while the sources from the coadded SDSS catalog have Mag_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

Zmag_Error
The uncertainty in the corresponding magnitude of the SDSS counterpart to the Chandra source. For the single-epoch matches, this value represents the SDSS pipeline reported ModelMagErr value, while the sources from the coadded SDSS catalog have MagErr_Auto values calculated via SExtractor (Bertin & Arnouts 1996, A&AS, 117, 393) as reported in the Jiang et al. (2014, ApJS, 213, 12) catalogs.

SDSS_Spect_Object_ID
The SDSS spectroscopic object identification number (SpecObjID) of the SDSS counterpart to the Chandra source.

Spect_Class
The optical spectroscopic class as indicated by the pipeline processing (for spectra downloaded from existing databases) or determined by the authors through visual inspection for sources targeted in our follow-up campaigns, if available. The possible values are:

     Value     Meaning

     QSO       broad emission lines in spectra;
     GALAXY    narrow emission lines and/or absorption lines only;
     STAR      stellar spectrum.
  

Redshift
The spectroscopic redshift of the source.

Ref_Redshift
The source of the spectroscopic redshift, coded as follows:

     0 = SDSS DR9 (Ahn et al., 2012, ApJS, 203, 21, CDS Cat. V/139)
     1 = 2SLAQ (Croom et al., 2009, MNRAS, 392, 19)
     2 = WiggleZ (Drinkwater et al., 2010, MNRAS, 401, 1429)
     3 = DEEP2 (Newman et al., 2013, ApJS, 208, 5)
     4 = SDSS spectrum re-fit/verified by the authors
     5 = SDSS DR10 (Ahn et al., 2014, ApJS, 211, 17)
     6 = Jiang et al. (2006, AJ, 131, 2788)
     7 = WIYN HYDRA follow-up observations from 2012 Dec
     8 = PRIMUS (Coil et al., 2011, ApJ, 741, 8)
     9 = VLT ISAAC follow-up observations from 2013 Aug
    10 = Keck NIRSPEC follow-up observations from 2013 Sep
    11 = SDSS DR12 (Alam et al., 2015, ApJS, 219, 12)
    12 = WIYN Hydra follow-up observations from 2013 Aug - Sep
    13 = WIYN HYDRA follow-up observations from 2014 Jan
    14 = WIYN HYDRA follow-up observations from 2014 Jun
    15 = WIYN HYDRA follow-up observations from 2014 Jul
    16 = WIYN HYDRA follow-up observations from 2014 Sep
    17 = WIYN HYDRA follow-up observations from 2015 Jan
    18 = Palomar DoubleSpec observations from 2014 Jul
    19 = MMT Hectospec (Ross et al., 2012, ApJS, 199, 3)
    20 = Palomar DoubleSpec observations from 2014 Dec
    22 = 6dF (Jones et al., 2004, MNRAS, 355, 747 and 2009, MNRAS, 399, 683,
          CDS Cat. VII/259)
    23 = VVDS (Le Fevre et al., 2003, Proc. SPIE 4841, 1670 and
          2005, A&A, 439, 845, CDS Cat. III/250; Garilli et al., 2008, A&A,
          486, 683; Le Fevre et al., 2013, A&A, A559, 14)
  

WISE_Name
The J2000.0 position-based source designation (WISE JHHMMSS.ss+DDMMSS.s) of the WISE counterpart to the Chandra source.

WISE_RA
The Right Ascension of the WISE counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

WISE_Dec
The Declination of the WISE counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

WISE_RA_Error
The positional uncertainty of the WISE counterpart position in Right Ascension, in arcseconds.

WISE_Dec_Error
The positional uncertainty of the WISE counterpart position in Declination, in arcseconds.

WISE_CXO_Rel
The reliability from the Maximum Likelihood Estimate (MLE) of the WISE source match to the Chandra source. The definition of this parameter used for counterpart selection is discussed in Section 4 of the reference paper.

WISE_CXO_Offset
The angular distance between the Chandra source and its WISE counterpart, in arcseconds.

W1_Mag
The W1 (3.4 um) magnitude of the WISE counterpart to the Chandra source. The procedure by which the authors obtained the WISE magnitudes is discussed in Section 4.3 of the reference paper.

W1_Mag_Error
The uncertainty in the corresponding magnitude of the WISE counterpart to the Chandra source.

W1_Mag_SNR
The signal-to-noise ratio (SNR) of the WISE counterpart detection in the W1 band. Any WISE magnitudes with SNR < 2 are upper limits.

W2_Mag
The W2 (4.6 um) magnitude of the WISE counterpart to the Chandra source. The procedure by which the authors obtained the WISE magnitudes is discussed in Section 4.3 of the reference paper.

W2_Mag_Error
The uncertainty in the corresponding magnitude of the WISE counterpart to the Chandra source.

W2_Mag_SNR
The signal-to-noise ratio (SNR) of the WISE counterpart detection in the W2 band. Any WISE magnitudes with SNR < 2 are upper limits.

W3_Mag
The W3 (12 um) magnitude of the WISE counterpart to the Chandra source. The procedure by which the authors obtained the WISE magnitudes is discussed in Section 4.3 of the reference paper.

W3_Mag_Error
The uncertainty in the corresponding magnitude of the WISE counterpart to the Chandra source.

W3_Mag_SNR
The signal-to-noise ratio (SNR) of the WISE counterpart detection in the W3 band. Any WISE magnitudes with SNR < 2 are upper limits.

W4_Mag
The W4 (22 um) magnitude of the WISE counterpart to the Chandra source. The procedure by which the authors obtained the WISE magnitudes is discussed in Section 4.3 of the reference paper.

W4_Mag_Error
The uncertainty in the corresponding magnitude of the WISE counterpart to the Chandra source.

W4_Mag_SNR
The signal-to-noise ratio (SNR) of the WISE counterpart detection in the W4 band. Any WISE magnitudes with SNR < 2 are upper limits.

WISE_Ext_Flag
This flag parameter is set to 'Y' to indicate that the WISE counterpart to the Chandra source is extended, else is set to 'N'.

WISE_Rej_Flag
This flag parameter is set to 'Y' to indicate that the WISE counterpart was found via MLE matching but was rejected due to failing photometry control checks in every WISE band, else is set to 'N'.

UKIDSS_ID
The UKIDSS identification number of the infrared counterpart to the Chandra source.

UKIDSS_RA
The Right Ascension of the UKIDSS counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

UKIDSS_Dec
The Declination of the UKIDSS counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

UKIDSS_CXO_Rel
The reliability from the Maximum Likelihood Estimate (MLE) of the UKIDSS source match to the Chandra source: the highest of the UKIDSS Y, J, H and K reliability values. The definition of this parameter used for counterpart selection is discussed in Section 4 of the reference paper.

UKIDSS_CXO_Offset
The angular distance between the Chandra source and its UKIDSS counterpart, in arcseconds.

Ymag
The Vega Y magnitude (1.02 um) of the UKIDSS counterpart to the Chandra source.

Ymag_Error
The uncertainty in the corresponding magnitude of the UKIDSS counterpart to the Chandra source.

Jmag
The Vega J magnitude of the UKIDSS counterpart to the Chandra source.

Jmag_Error
The uncertainty in the corresponding magnitude of the UKIDSS counterpart to the Chandra source.

Hmag
The Vega H magnitude of the UKIDSS counterpart to the Chandra source.

Hmag_Error
The uncertainty in the corresponding magnitude of the UKIDSS counterpart to the Chandra source.

Kmag
The Vega K magnitude of the UKIDSS counterpart to the Chandra source.

Kmag_Error
The uncertainty in the corresponding magnitude of the UKIDSS counterpart to the Chandra source.

UKIDSS_Rej_Flag
This flag parameter is set to 'Y' to indicate that the UKIDSS counterpart was found via MLE matching, but was rejected due to failing photometry control checks, else is set to 'N'.

VHS_ID
The VHS identification number of the infrared counterpart to the Chandra source.

VHS_RA
The Right Ascension of the VHS counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

VHS_Dec
The Declination of the VHS counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

VHS_CXO_Rel
The reliability from the Maximum Likelihood Estimate (MLE) of the VHS source match to the Chandra source: the highest of the VHS J, H and K reliability values. The definition of this parameter used for counterpart selection is discussed in Section 4 of the reference paper.

VHS_CXO_Offset
The angular distance between the Chandra source and its VHS counterpart, in arcseconds.

VHS_Jmag
The Vega J magnitude of the VHS counterpart to the Chandra source.

VHS_Jmag_Error
The uncertainty in the corresponding magnitude of the VHS counterpart to the Chandra source.

VHS_Hmag
The Vega H magnitude of the VHS counterpart to the Chandra source.

VHS_Hmag_Error
The uncertainty in the corresponding magnitude of the VHS counterpart to the Chandra source.

VHS_Kmag
The Vega K magnitude of the VHS counterpart to the Chandra source.

VHS_Kmag_Error
The uncertainty in the corresponding magnitude of the VHS counterpart to the Chandra source.

VHS_Rej_Flag
This flag parameter is set to 'Y' to indicate that the VHS counterpart was found via MLE matching, but was rejected due to failing photometry control checks, else is set to 'N'.

GALEX_ID
The GALEX object identification number (ObjID) of the GALEX counterpart to the Chandra source.

GALEX_RA
The Right Ascension of the GALEX counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

GALEX_Dec
The Declination of the GALEX counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

GALEX_NUV_Error_Radius
The positional uncertainty of the GALEX NUV (1771-2831 Angstrom) counterpart to the Chandra source, in arcseconds.

GALEX_FUV_Error_Radius
The positional uncertainty of the GALEX FUV (1344-1786 Angstrom) counterpart to the Chandra source, in arcseconds.

GALEX_CXO_Rel
The reliability from the Maximum Likelihood Estimate (MLE) of the GALEX source match to the Chandra source: the higher of the FUV and NUV reliability values. The definition of this parameter used for counterpart selection is discussed in Section 4 of the reference paper..

GALEX_CXO_Offset
The angular distance between the Chandra source and its GALEX counterpart, in arcseconds.

NUV_Mag
The NUV (1771-2831 Angstrom) AB magnitude of the GALEX counterpart to the Chandra source.

NUV_Mag_Error
The uncertainty in the corresponding magnitude of the GALEX counterpart to the Chandra source.

FUV_Mag
The FUV (1344-1786 Angstrom) AB magnitude of the GALEX counterpart to the Chandra source.

FUV_Mag_Error
The uncertainty in the corresponding magnitude of the GALEX counterpart to the Chandra source.

FIRST_Name
The name of the FIRST counterpart to the Chandra source, viz., FIRST JHHMMSS.s+DDMMSS.

FIRST_RA
The Right Ascension of the FIRST counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

FIRST_Dec
The Declination of the FIRST counterpart to the Chandra source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 0.001 degrees (3.6 arcseconds) in the original table.

FIRST_CXO_Offset
The angular distance between the Chandra source and its FIRST counterpart, in arcseconds.

Flux_20_cm
The integrated 1.4-GHz flux density of the FIRST counterpart to the Chandra source, in mJy.

Flux_20_cm_Error
The uncertainty in the integrated 1.4-GHz flux density of the FIRST counterpart to the Chandra source, in mJy. This was calculated by multiplying the integrated flux density by the ratio of the RMS to the peak flux density.

Herschel_RA
The Right Ascension of the Herschel counterpart to the Chandra source in the selected equinox taken from the HeRS survey (Viero et al. 2014, ApJS, 210, 22). This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

Herschel_Dec
The Declination of the Herschel counterpart to the Chandra source in the selected equinox taken from the HeRS survey (Viero et al. 2014, ApJS, 210, 22). This was given in J2000.0 decimal degrees to a precision of 0.01 degrees (36 arcseconds) in the original table.

Herschel_CXO_Offset
The angular distance between the Chandra source and its Herschel counterpart, in arcseconds.

Flux_250_um
The 250-um flux density of the Herschel counterpart to the Chandra source, in mJy.

Flux_250_um_Error
The uncertainty in the corresponding flux density of the Herschel counterpart to the Chandra source, in mJy.

Flux_350_um
The 350-um flux density of the Herschel counterpart to the Chandra source, in mJy.

Flux_350_um_Error
The uncertainty in the corresponding flux density of the Herschel counterpart to the Chandra source, in mJy.

Flux_500_um
The 500-um flux density of the Herschel counterpart to the Chandra source, in mJy.

Flux_500_um_Error
The uncertainty in the corresponding flux density of the Herschel counterpart to the Chandra source, in mJy.

XMM_AO10_Prom_Match
This parameter contains a flag to indicate that a multi-wavelength counterpart is promoted into this catalog: the multi-wavelength association did not meet the MLE reliability threshold when matching to the Chandra catalog, but did meet this requirement for the same X-ray source in the XMM-Newton archival and AO10 catalog. The number indicates in which catalog the promoted match is found, as follows:

    Value  Meaning

     1     SDSS counterpart found but photometry rejected for failing quality
           control checks;
     2     SDSS;
     3     redshift;
     4     WISE counterpart found but rejected for failing quality control
           checks;
     5     WISE
     6     UKIDSS
     7     VHS
     8     GALEX
  

XMM_AO13_Prom_Match
This parameter contains a flag to indicate that a multi-wavelength counterpart is promoted into this catalog: the multi-wavelength association did not meet the MLE reliability threshold when matching to the Chandra catalog, but did meet this requirement for the same X-ray source in the XMM- Newton AO13 catalog. The number indicates in which catalog the promoted match is found, as follows:

    Value  Meaning

     1     SDSS counterpart found but photometry rejected for failing quality
           control checks;
     2     SDSS;
     3     redshift;
     4     WISE counterpart found but rejected for failing quality control
           checks;
     5     WISE
     6     UKIDSS
     7     VHS
     8     GALEX
  

Ctrpt_Coord_Flag
This parameter contains a flag which is set to 0 if the multi-wavelength counterpart coordinates are consistent within 2 arcseconds (SDSS, UKIDSS, VHS, FIRST) or 3 arcseconds (WISE, GALEX, Herschel); otherwise the flag value is set to 1.

Class
The HEASARC Browse object classification of the source, based on the value of the spect_class parameter.


Contact Person

Questions regarding the SDSSS82CXO database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 13-Jan-2017