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CCOSMOSOID - Chandra COSMOS (C-COSMOS) Survey Optical/IR Counterparts Catalog

HEASARC
Archive

Overview

The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8-Ms, Chandra program that has imaged the central 0.9 deg2 of the COSMOS field down to limiting depths of 1.9 x 10-16 erg/cm2/s in the soft (0.5-2 keV) band, 7.3 x 10-16 erg/cm2/s in the hard (2-10 keV) band, and 5.7 x 10-16 erg/cm2/s in the full (0.5-10 keV) band. In this Paper III of the series of papers on this survey, the authors report the i, K, and 3.6-um identifications of the 1761 X-ray point sources. They use the likelihood ratio technique to derive the association of optical/infrared counterparts for 97% of the X-ray sources. For most of the remaining 3%, the presence of multiple counterparts or the faintness of the possible counterpart prevented a unique association. For only 10 X-ray sources, they were not able to associate a counterpart, mostly due to the presence of a very bright field source close by. Only two sources are truly empty fields. The full catalog, including spectroscopic and photometric redshifts and classification described here in detail, is available herein.

Catalog Bibcode

2012ApJS..201...30C

References

The Chandra COSMOS survey.
III. Optical and infrared identification of X-ray point sources.
    Civano F., Elvis M., Brusa M., Comastri A., Salvato M., Zamorani G.,
    Aldcroft T., Bongiorno A., Capak P., Cappelluti N., Cisternas M., Fiore F.,
    Fruscione A., Hao H., Kartaltepe J., Koekemoer A., Gilli R., Impey C.D.,
    Lanzuisi G., Lusso E., Mainieri V., Miyaji T., Lilly S., Masters D.,
    Puccetti S., Schawinski K., Scoville N.Z., Silverman J., Trump J., Urry M.,
    Vignali C., Wright N.J.
   <Astrophys. J. Suppl. Ser., 201, 30 (2012)>
   =2012ApJS..201...30C

The Chandra Survey of the COSMOS Field.
II. Source Detection and Photometry
    Puccetti S., Vignali C., Cappelluti N., Fiore F., Zamorani G., Aldcroft
    T.L., Elvis M., Gilli R., Miyaji T., Brunner H., and 8 coauthors
   <Astrophys. J. Suppl. Ser., 185, 586 (2009)>
   =2009ApJS..185..586P

The Chandra COSMOS survey.
I. Overview and point source catalog.
    Elvis M., Civano F., Vignali C., Puccetti S., Fiore F., Cappelluti N.,
    Aldcroft T.L., Fruscione A., Zamorani G., Comastri A., Brusa M., Gilli R.,
    Miyaji T., Damiani F., Koekemoer A.M., Finoguenov A., Brunner H.,
    Urry C.M., Silverman J., Mainieri V., Hasinger G., Griffiths R.,
    Carollo M., Hao H., Guzzo L., Blain A., Calzetti D., Carilli C., Capak P.,
    Ettori S., Fabbiano G., Impey C., Lilly S., Mobasher B., Rich M.,
    Salvato M., Sanders D.B., Schinnerer E., Scoville N., Shopbell P.,
    Taylor J.E., Taniguchi Y., Volonteri M.
   <Astrophys. J. Suppl. Ser., 184, 158-171 (2009)>
   =2009ApJS..184..158E

Provenance

This table was created by the HEASARC in December 2012, based on the CDS Catalog J/ApJS/201/30 file catalog.dat.

Parameters

Name
The Chandra COSMOS (C-COSMOS) source name, viz., 'CXOC JHHMMSS.s+DDMMSS', following the standard IAU naming convention with the prefix standing for Chandra X-Ray Observatory COSMOS survey, similar to the style used in Elvis et al. 2009, ApJS, 184, 158, Paper I, the HEASARC CCOSMOSCAT table). The names themselves often differ slightly from those used in the latter catalog, partially because the present authors appear to have rounded the coordinates up or down rather than truncating them (as the standard recommends) to form the names.

Source_Number
The C-COSMOS source number. Sources are listed in order of detection as in Paper I: first those detected in the full band with detml >= 10.8, followed by those detected in the soft band only and by those detected in the hard band only.

RA
The Right Ascension of the C-COSMOS source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-5 degrees in the original table.of the C-COSMOS source in the selected equinox.

Dec
The Declination of the C-COSMOS source in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-6 degrees in the original table.of the C-COSMOS source in the selected equinox.

LII
The Galactic Longitude of the C-COSMOS source.

BII
The Galactic Latitude of the C-COSMOS source.

SB_Flux
The X-ray flux in the soft band (0.5-2.0 keV), in erg s-1 cm-2. Negative fluxes represent upper limits as computed following the prescriptions of Puccetti et al. (2009, ApJS, 185, 586, Paper II).

HB_Flux
The X-ray flux in the hard band (2-10 keV), in erg s-1 cm-2. Negative fluxes represent upper limits as computed following the prescriptions of Puccetti et al. (2009, ApJS, 185, 586, Paper II).

Flux
The X-ray flux in the full band (0.5-10 keV), in erg s-1 cm-2. Negative fluxes represent upper limits as computed following the prescriptions of Puccetti et al. (2009, ApJS, 185, 586, Paper II).

Ctrpart_RA
The Right Ascension of the optical/IR counterpart to the C-COSMOS source, as determined in the reference paper (III), in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-5 degrees in the original table.

Ctrpart_Dec
The Declination of the optical/IR counterpart to the C-COSMOS source, as determined in the reference paper (III), in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-6 degrees in the original table.

Capak_Source_Number
The identifier of the optical counterpart to the C-COSMOS source, from the optical catalog of Capak et al. (2007, ApJS, 172, 99). To form the corresponding name, it is recommended that the prefix 'COSMOS' and this source number is used.

Ilbert_Source_Number
The identifier of the optical counterpart to the C-COSMOS source, from the revised version of the optical catalog (Ilbert et al. 2009, ApJ, 690, 1236). To form the corresponding name, the HEASARC recommends that the prefix 'COSMOS-r' and this source number is used.

CI_Ctrpart_RA
The Right Ascension of the optical counterpart to the C-COSMOS source, as given in Capak et al. (2007, ApJS, 172, 99) and Ilbert et al. (2009, ApJ, 690, 1236), in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-5 degrees in the original table.

CI_Ctrpart_Dec
The Declination of the optical counterpart to the C-COSMOS source, as given in Capak et al. (2007, ApJS, 172, 99) and Ilbert et al. (2009, ApJ, 690, 1236), in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-6 degrees in the original table.

Imag
The i-band AB magnitude (in a 3" aperture) of the optical counterpart to the C-COSMOS source, from Capak et al. (2007, ApJS, 172, 99)

Imag_Error
The error in the i-band AB magnitude (in a 3" aperture) of the optical counterpart to the C-COSMOS source, from Capak et al. (2007, ApJS, 172, 99)

Kmag_Ctrpart_RA
The Right Ascension of the K-band counterpart to the C-COSMOS source, as given in the catalog of McCracken et al. (2010, ApJ, 708, 202), in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-6 degrees in the original table.

Kmag_Ctrpart_Dec
The Declination of the K-band counterpart to the C-COSMOS source, as given in the catalog of McCracken et al. (2010, ApJ, 708, 202), in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-6 degrees in the original table.

Kmag
The K-band AB magnitude (in a 3" aperture) of the IR counterpart to the C-COSMOS source, from McCracken et al. (2010, ApJ, 708, 202).

Kmag_Error
The error in the K-band AB magnitude (in a 3" aperture) of the IR counterpart to the C-COSMOS source, from McCracken et al. (2010, ApJ, 708, 202).

IRAC_Ctrpart_RA
The Right Ascension of the 3.6-um counterpart to the C-COSMOS source, as given in the IRAC catalog (Sanders et al. 2007, ApJS, 172, 86), in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-6 degrees in the original table.

IRAC_Ctrpart_Dec
The Declination of the 3.6-um counterpart to the C-COSMOS source, as given in the IRAC catalog (Sanders et al. 2007, ApJS, 172, 86), in the selected equinox. This was given in J2000.0 decimal degrees to a precision of 10-6 degrees in the original table.

Flux_3p6_um
The Spitzer/IRAC 3.6-micron flux (in a 1.9" aperture) of the counterpart to the C-COSMOS source, as given in the IRAC catalog (Sanders et al. 2007, ApJS, 172, 86), in microJansky (uJy). To convert to total flux, the standard factor suggested in the IRAC User Guide has to be applied, i.e., division of this value by 0.765.

Flux_3p6_um_Error
The error in the Spitzer/IRAC 3.6-micron flux (in a 1.9" aperture) of the counterpart to the C-COSMOS source, as given in the IRAC catalog (Sanders et al. 2007, ApJS, 172, 86), in microJansky (uJy).

Final_Id_Flag
The final counterpart identification flag, where 1 means secure, 10 means ambiguous, 100 means sub-threshold, and blank means that no counterpart was identified.

Star_Flag
The star flag, used to isolate stars, where 1 means a spectroscopic confirmed star, and 10 means a 'photometric' star.

Off_Nuclear_Flag
This Boolean off-nuclear flag parameter is set to 1 to isolate the seven off-nuclear sources from Mainieri et al. (2010, A&A, 514, A85).

Redshift
The spectroscopic redshift of the counterpart to the C-COSMOS source, taken from the optical, K-band, and/or 3.6-micron catalogs listed in Section 6 of the reference paper.

Broad_Type
A flag describing the spectroscopic classification of the source, where 1 means a broad-lined AGN (BLAGN), 2 means a non-BLAGN, and 0 means a star. (See Section 6.1 of the reference paper for more details).

Redshift_Flag
A flag indicating the spectroscopic redshift quality of the source, as follows:

     blank = no spectroscopic redshift is available (860 sources),
     3     = two or more emission and/or absorption lines (97 sources),
     4     = good signal-to-noise ratio and two or more emission and/or
              absorption line (802 sources),
     9     = significance of this value is not known to the HEASARC (2 sources).
  

Ref_Redshift
A reference code for the origin of the spectroscopic redshift, as follows:

     1      = SDSS (Sloan Digital Sky Survey)
     2      = Hectospec at MMT (Mount Hopkins; Arizona)
     3 or 4 = IMACS at Magellan (Las Campanas)
     5      = zCOSMOS bright,
     6      = zCOSMOS deep,
     7      = Keck Observatory (Hawaii),
     8      = other (FAST telescope, FMOS, WFC3).
  

Phot_Redshift
The photometric redshift of the counterpart to the C-COSMOS source, taken from Salvato et al. (2011, ApJ, 742, 61).

Phot_SED_Type
The photometric classification of the counterpart to the C-COSMOS source from SED Fitting, where 1 means unobscured, 2 means obscured and 3 means a galaxy.

XMMC_Name
The name of the corresponding X-ray source in the XMM-COSMOS Catalog (Cappelluti et al. 2009, A&A, 497, 635).


Contact Person

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

Page Author: Browse Software Development Team
Last Modified: 21-Dec-2012