J/ApJS/201/30 The Chandra COSMOS survey. III. (Civano+, 2012)
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 2012ApJS..201...30C
ADC_Keywords: Cross identifications ; Surveys ; Active gal. nuclei ;
X-ray sources ; Photometry, infrared ; Galaxies, optical
Keywords: galaxies: active - surveys - X-rays: galaxies: clusters
Abstract:
The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8Ms, Chandra
program that has imaged the central 0.9deg2 of the COSMOS field down
to limiting depths of 1.9x10-16erg/cm2/s in the soft (0.5-2keV)
band, 7.3x10-16erg/cm2/s in the hard (2-10keV) band, and
5.7x10-16erg/cm2/s in the full (0.5-10keV) band. In this paper we
report the i, K, and 3.6um identifications of the 1761 X-ray point
sources. We 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 we 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 online.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
catalog.dat 259 1761 Chandra-COSMOS identification catalog
--------------------------------------------------------------------------------
See also:
II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)
J/A+A/542/A16 : X-ray detection of radio-selected galaxies (Ranalli+, 2012)
J/ApJ/742/61 : Redshift of AGN from XMM- and C-COSMOS (Salvato+, 2011)
J/ApJ/716/348 : The XMM-Newton survey of the COSMOS field (Brusa+, 2010)
J/ApJ/725/480 : Stellar X-ray sources in the COSMOS survey (Wright+, 2010)
J/A+A/497/635 : XMM-Newton survey in COSMOS field (Cappelluti+, 2009)
J/ApJS/172/29 : XMM-Newton survey in COSMOS field. I. (Hasinger+, 2007)
J/ApJS/184/158 : Chandra COSMOS survey I. (Elvis+, 2009)
http://irsa.ipac.caltech.edu/data/COSMOS/ : COSMOS archive
Byte-by-byte Description of file: catalog.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [CXOC]
5- 19 A15 --- CXOC IAU identificator (HHMMSS.s+DDMMSS; J2000) as
in Paper I (Elvis et al. 2009, J/ApJS/184/158) (5)
20 A1 --- f_CXOC [*+] Problem with CXOC name (5)
22- 26 I5 --- CID [1/22962] Chandra identifier, CID, according
to Elvis et al. 2009, Cat. J/ApJS/184/158 (1)
28- 37 F10.6 deg RAdeg X-ray right ascension in decimal degrees (J2000)
39- 46 F8.6 deg DEdeg X-ray declination in decimal degrees (J2000)
48- 56 E9.3 mW/m2 Fsoft X-ray 0.5-2 keV flux (in cgs unit) (2)
58- 66 E9.3 mW/m2 Fhard X-ray 2-10 keV flux (in cgs unit) (2)
68- 76 E9.3 mW/m2 Ffull X-ray 0.5-10 keV flux (in cgs unit) (2)
78- 87 F10.6 deg RACdeg ? RA of the opt/IR counterpart, as determined
in this paper (J2000)
89- 98 F10.6 deg DECdeg ? Dec of the opt/IR counterpart, as
determined in this paper (J2000)
100-106 I7 --- COSMOS [136961/2791454]? Optical identifier from
Capak et al. catalog (Cat. II/284)
108-114 I7 --- I09ID [89570/1733715]? Optical id from the revised
catalog (Ilbert et al. 2009ApJ...690.1236I 2009ApJ...690.1236I)
116-125 F10.6 deg RAOdeg ? Coordinate of the optical counterpart (J2000)
127-136 F10.6 deg DEOdeg ? Coordinate of the optical counterpart (J2000)
138-143 F6.2 mag imag ?=-99 i(AB) band magnitude (at 3" aperture)
from Capak et al. 2007, Cat. II/284
145-149 F5.2 mag e_imag ? i(AB) band magnitude error
151-160 F10.6 deg RAKdeg ? RA of the K-band counterpart (J2000)
162-171 F10.6 deg DEKdeg ? Dec of the K-band counterpart (J2000)
173-177 F5.2 mag Kmag ? K(AB) band magnitude (at 3" aperture) from
McCracken et al. 2010ApJ...708..202M 2010ApJ...708..202M
179-183 F5.2 mag e_Kmag ? K(AB) band magnitude error
185-194 F10.6 deg RAIdeg ? RA of the IRAC 3.6 micron counterpart (J2000)
196-205 F10.6 deg DEIdeg ? Dec of the IRAC 3.6 micron counterpart (J2000)
207-214 F8.2 uJy F3.6 ? Spitzer/IRAC 3.6 micron flux from Sanders et al.
2007ApJS..172...86S 2007ApJS..172...86S
216-221 F6.2 uJy e_F3.6 ? 3.6 micron flux error
223-225 I3 --- fID [1/100]? Final identification flag (1=secure,
10=ambiguous, blank=unidentified,
100=subthreshold)
227-228 I2 --- f* [1/10]? Flag indicating a star
(1=spectroscopic confirmed star,
10=photometric star, 100=visually identified star)
230 I1 --- of [1]? Off-nuclear flag to isolate the seven
off-nuclear sources from Mainieri et al.
2010A&A...514A..85M 2010A&A...514A..85M
232-236 F5.3 --- zsp [0/5.3]? Spectroscopic redshift from the
optical, K or 3.6um catalogs
237-239 A3 --- --- [000]
241 I1 --- f_zsp [0/2]? Spectroscopic classification (1=BLAGN,
2=not-BLAGN, 0=star)
243 I1 --- q_zsp [3/9]? Spectroscopic redshift quality (3)
245 I1 --- n_zsp [1/8]? Spectroscopic redshift origin (4)
247-251 F5.3 --- zph [0/6.84]? Photometric redshift from Salvato
et al. 2011ApJ...742...61S 2011ApJ...742...61S
253 I1 --- f_zph [1/3]? Photometric redshift classification
from the SED fitting (1=unobscured,
2=obscured, 3=galaxy)
255-259 I5 --- XMMC [1/70250]? XMM identifier from Brusa et al.
2010, Cat. J/ApJ/716/348/Cappelluti, 2009,
Cat. J/A+A/497/635
--------------------------------------------------------------------------------
Note (1): Sources are listed in order of detection as in Paper I (Elvis et al.
2009, Cat. J/ApJS/184/158): 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.
Note (2): Negative fluxes represent upper limits as computed following the
prescriptions of Paper II (Puccetti et al. 2009ApJS..185..586P 2009ApJS..185..586P).
Note (3): Quality flag as follows:
3 = two or more emission and/or absorption lines,
4 = good signal-to-noise ratio and two or more emission and/or absorption
lines.
Note (4): Origin of the spectroscopic redshift as follows:
1 = SDSS (Sloan Digital Sky Survey)
2 = Hectoscpec at MMT (Mount Hopkins; Arizona)
3 or 4 = IMACS at Magellan (Las Campanas)
5 = zCOSMOS bright,
6 = zCOSMOS deep,
7 = Keck Observaytory (Hawaii)
8 = other (FAST telescope, FMOS, WFC3).
Note (5): the CXOC name does not match Elvis et al. 2009 (J/ApJS/184/158),
and the "f_CXOC" flag was added at CDS to reflect the problem:
the plus (+) indicates a mismatching CXOC name, and the asterisk (*)
indicates an erroneous name corrected at CDS;
see also the "Nomenclature Note" section below
--------------------------------------------------------------------------------
Nomenclature Note:
The CXOC name is apparently not following the IAU conventions as
claimed (truncated position at 0.1s in RA and 1" in Dec).
History:
* 09-Oct-2012: From electronic version of the journal
(originally a FITS table)
* 21-Dec-2012: Three CXOC names were corrected at CDS (following a
remark by Steve Drake, Heasarc at NASA-Goddard), for CID numbers
1214, 1246 and 3760. A "+" flag was also added for 1247 sources
which differ from the PaperI (Elvis et al. 2009, Cat. J/ApJS/184/158)
References:
Elvis et al. Paper I. 2009ApJS..184..158E 2009ApJS..184..158E Cat. J/ApJS/184/158
Puccetti et al. Paper II. 2009ApJS..185..586P 2009ApJS..185..586P
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 09-Oct-2012