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XMMCOSMOID - XMM-COSMOS Catalog of Optical/IR Counterparts

HEASARC
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Overview

This table contains the final optical identifications of the medium-depth (~60 ks), contiguous (2 degree2) XMM-Newton survey of the COSMOS field. XMM-Newton has detected ~1800 X-ray sources down to limiting fluxes of ~5 x 10-16, ~3 x 10-15, and ~7 x 10-15 erg cm-2 s-1 in the 0.5-2 keV, 2-10 keV, and 5-10 keV bands, respectively (~1 x 10-15, ~6 x 10-15, and ~1 x 10-14 erg cm-2 s-1, in the three bands, respectively, over 50% of the area). The work is complemented by an extensive collection of multiwavelength data from 24 microns to UV, available from the COSMOS survey, for each of the X-ray sources, including spectroscopic redshifts for >~50% of the sample, and high-quality photometric redshifts for the rest. The XMM-Newton and multiwavelength flux limits are well matched: 1760 (98%) of the X-ray sources have optical counterparts, 1711 (~95%) have IRAC counterparts, and 1394 (~78%) have MIPS 24 um detections. Thanks to the redshift completeness (almost 100%) the authors were able to constrain the high-luminosity tail of the X-ray luminosity function confirming that the peak of the number density of log L_X > 44.5 active galactic nuclei (AGNs) is at z ~ 2. Spectroscopically identified obscured and unobscured AGNs, as well as normal and star-forming galaxies, present well-defined optical and infrared properties. The authors devised a robust method to identify a sample of ~150 high-redshift (z > 1), obscured AGN candidates for which optical spectroscopy is not available. They were able to determine that the fraction of the obscured AGN population at the highest (L_X > 1044 erg s-1) X-ray luminosity is ~15%-30% when selection effects are taken into account, providing an important observational constraint for X-ray background synthesis. The authors studied in detail the optical spectrum and the overall spectral energy distribution of a prototypical Type 2 QSO (source number 2028), caught in a stage transitioning from being starburst dominated to AGN dominated, which was possible to isolate only thanks to the combination of X-ray and infrared observations.

Catalog Bibcode

2010ApJ...716..348B

References

The XMM-Newton Wide-field Survey in the Cosmos Field (XMM-COSMOS): Demography
and Multiwavelength Properties of Obscured and Unobscured Luminous Active
Galactic Nuclei
    Brusa M., Civano F., Comastri A., Miyaji T., Salvato M., Zamorani G.,
    Cappelluti N., Fiore F., Hasinger G., Mainieri V., Merloni A., Bongiorno A.,
    Capak P., Elvis M., Gilli R., Hao H.; Jahnke K., Koekemoer A.M., Ilbert O.,
    Le Floc'h E., Lusso E., Mignoli M., Schinnerer E., Silverman J.D.,
    Treister E., Trump J.D., Vignali C., Zamojski M., Aldcroft T., Aussel H.,
    Bardelli S., Bolzonella M., Cappi A., Caputi K., Contini T., Finoguenov A.,
    Fruscione A., Garilli B., Impey C.D., Iovino A., Iwasawa K., Kampczyk P.,
    Kartaltepe J., Kneib J.P., Knobel C., Kovac K., Lamareille F.,
    Leborgne J.-F., Le Brun V., Le Fevre O., Lilly S. J., Maier C.,
    McCracken H.J., Pello R., Peng Y.-J., Perez-Montero E., de Ravel L.,
    Sanders D., Scodeggio M., Scoville N.Z., Tanaka M., Taniguchi Y., Tasca L.,
    de la Torre S., Tresse L., Vergani D., Zucca E.
   <Astrophys. J. 716, 348 (2010)>
   =2010ApJ...716..348B

Provenance

This table was created by the HEASARC in July 2010 based on the electronic version of Table 2 from the paper which was obtained from the Astrophysical Journal web site.

The HEASARC has made some changes to this material in order to make it more compliant with CDS/IAU Nomenclature and HEASARC table standards:

(i) The original naming convention suggested by the authors used a prefix of 'XMMC_' and the J2000.0 RA and Dec position in decimal degrees to 10-5 degrees precision, e.g., XMMC_150.10515+1.98082'; the HEASARC has replaced these names by alternative new ones (in the alt_name parameter) of the form 'XMMU JHHMMSS.s+DDMMSS' where the prefix is the usual one for XMM-Newton sources and the remainder of the field is the J2000.0 equatorial coordinates truncated to 0.1 seconds of time in RA and to 1 arcsecond in Declination;

(ii) We have used for the alt_name parameter the naming convention recommended by the Dictionary of Nomenclature of Celestial Objects for XMM-COSMOS sources, viz. the "XMMC' prefix and the source (XID) number, e.g., "XMMC 2028'.


Parameters

Source_Number
The XMM-COSMOS identification (XID) Number for the source, from Cappelluti et al. (2009, A&A, 497, 635).

Alt_Name
The name for the X-ray source using the naming convention recommended by the Dictionary of Nomenclature of Celestial Objects for XMM-COSMOS sources, viz. the 'XMMC' prefix and the source (XID) number, e.g., "XMMC 2028'.

Name
The name of the X-ray source in the form 'XMMU JHHMMSS.s+DDMMSS' where the prefix is the usual one for XMM-Newton sources and the remainder of the field is the J2000.0 equatorial coordinates truncated to 0.1 seconds of time in RA and to 1 arcsecond in Declination. The naming convention suggested by the authors and given in the published paper used a prefix of 'XMMC_' and the J2000.0 RA and Dec position in decimal degrees to 10-5 degrees precision, e.g., XMMC_150.10515+1.98082' which is not a format recognized by the Dictionary of Nomenclature of Celestial Objects.

RA
The Right Ascension of the optical/IR counterpart to the XMM-Newton X-ray source in the selected equinox. This was given in J2000.0 equatorial coordinates in decimal degrees to a precision of 10-5 degrees in the original table.

Dec
The Declination of the optical/IR counterpart to the XMM-Newton X-ray source in the selected equinox. This was given in J2000.0 equatorial coordinates in decimal degrees to a precision of 10-5 degrees in the original table.

LII
The Galactic Longitude of the optical/IR counterpart to the XMM-Newton X-ray source.

BII
The Galactic Latitude of the optical/IR counterpart to the XMM-Newton X-ray source.

SB_Flux
The soft-band (0.5-2 keV) flux of the XMM-Newton X-ray source, in erg cm-2 s-1, taken from Cappelluti et al. (2009, A&A, 497, 635). A negative flux value, e.g., -1.27E-13, indicates that the quoted value is an upper limit, in this case of 1.27E-13, rather than a detection.

HB_Flux
The hard-band (2-10 keV) flux of the XMM-Newton X-ray source, in erg cm-2 s-1, taken from Cappelluti et al. (2009, A&A, 497, 635). A negative flux value, e.g., -1.27E-13, indicates that the quoted value is an upper limit, in this case of 1.27E-13, rather than a detection.

UHB_Flux
The ultrahard-band (5-10) keV flux of the XMM-Newton X-ray source, in erg cm-2 s-1, taken from Cappelluti et al. (2009, A&A, 497, 635). A negative flux value, e.g., -1.27E-13, indicates that the quoted value is an upper limit, in this case of 1.27E-13, rather than a detection.

FLS_Flag
This flag is set to 1 if the source is in the flux-limited subsample, else is set to 0. The authors defined a subsample of sources detected above the limiting fluxes corresponding to a sky coverage of more than 1 degree2 in at least one of the three X-ray energy ranges considered, namely: 1 x 10-15 erg cm-2 s-1, 6 x 10-15 erg cm-2 s-1, and 1 x 10-14 erg cm-2 s-1, in the 0.5-2 keV, 2-10 keV, or 5-10 keV bands, respectively. This subsample includes 1651 X-ray sources that the authors then used to investigate the multiwavelength properties of XMM counterparts (see Section 7 of the published paper).

Hardness_Ratio
The hardness ratio HR of the X-ray source, defined as HR = (H - S)/(H + S) where H are the hard-band counts and S the soft-band counts, respectively.

CCOSMOS_Source_Number
The Elvis et al. (2009, ApJS, 184, 158) Chandra-COSMOS (C-COSMOS) identifier number corresponding to the XMM-Newton source.

Optical_Ident_Flag
This flag parameter indicates the status of the optical identification of the X-ray source, according to the classes described in Table 1 of the published paper, where sources flagged with 1 are the 'reliable' counterparts, sources flagged with 10 are the ambiguous counterparts, and sources flagged with 0 are statistically not identified. For the 203 sources with ambiguous counterparts, only the most likely counterpart is listed in this table.

Capak_Source_Number
The Capak et al. (2007, ApJS, 172, 99) optical multiband catalog identifier number of the optical counterpart to the XMM-Newton X-ray source.

Ilbert_Source_Number
The identifier number as reported in the optical catalog and in Ilbert et al. (2009, ApJ, 690, 1236) catalog for the IRAC counterpart to the XMM-Newton X-ray source.

Rmag
The r-band AB magnitude of the counterpart to the XMM-Newton X-ray source, from Capak et al. (2007, ApJS, 172, 99).

Imag
The I-band AB magnitude of the counterpart to the XMM-Newton X-ray source, from Capak et al. (2007, ApJS, 172, 99).

Kmag
The K-band AB magnitude of the counterpart to the XMM-Newton X-ray source, from McCracken et al. (2010, ApJ, 708. 202).

Flux_3p6_um
The Spitzer IRAC 3.6-micron band flux density of the counterpart to the XMM-Newton X-ray source, in microJanskies (uJy), from Ilbert et al. (2009, ApJ, 690, 1236).

Flux_4p5_um
The Spitzer IRAC 4.5-micron band flux density of the counterpart to the XMM-Newton X-ray source, in microJanskies (uJy), from Ilbert et al. (2009, ApJ, 690, 1236).

Flux_5p8_um
The Spitzer IRAC 5.8-micron band flux density of the counterpart to the XMM-Newton X-ray source, in microJanskies (uJy), from Ilbert et al. (2009, ApJ, 690, 1236).

Flux_8p0_um
The Spitzer IRAC 8.0-micron band flux density of the counterpart to the XMM-Newton X-ray source, in microJanskies (uJy), from Ilbert et al. (2009, ApJ, 690, 1236).

Flux_24_um
The Spitzer MIPS 24-micron band flux density of the counterpart to the XMM-Newton X-ray source, in milliJanskies (mJy), from Le Floc'h et al. (2009, ApJ, 703, 222).

Redshift
The spectroscopic redshift of the source: see Section 5 of the published paper for more details on the derivation of the redshifts.

Broad_Type
The spectroscopic classification of the source, according to the classes described in Section 5.1 of the reference paper, viz.: 1 for broad-lined AGN, 2 for narrow-line AGN and 3 for normal/star-forming galaxy. Unclassified sources are indicated by values of -99.

Ref_Redshift
A code giving the origin of the spectroscopic redshifts. The codes for the source of the spectroscopic redshift are the following:

  1: SDSS;
  2: MMT (Prescott et al. 2006, ApJ, 644, 100);
  3, 4: IMACS runs (Trump et al. 2007 ApJS, 172, 383; 2009, ApJ,696, 1195 );
  5: zCOSMOS 20k catalog (Lilly et al. 2007, ApJS, 172, 70);
  6: zCOSMOS faint 4.5k catalog;
  7; Keck runs
  

Phot_Redshift
The photometric redshift of the source from Salvato et al. (2009, ApJ, 690, 1250): see Section 5 of the published paper for more details on the derivation of the redshifts.

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


Contact Person

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

Page Author: Browse Software Development Team
Last Modified: 3-Aug-2010