J/ApJS/202/6 XDEEP2 survey catalog (Goulding+, 2012)
The Chandra X-ray point-source catalog in the DEEP2 Galaxy Redshift Survey
fields.
Goulding A.D., Forman W.R., Hickox R.C., Jones C., Kraft R., Murray S.S.,
Vikhlinin A., Coil A.L., Cooper M.C., Davis M., Newman J.A.
<Astrophys. J. Suppl. Ser., 202, 6 (2012)>
=2012ApJS..202....6G 2012ApJS..202....6G
ADC_Keywords: Active gal. nuclei ; X-ray sources ; Surveys ; Galaxies, optical ;
Cross identifications
Keywords: galaxies: active - surveys - X-rays: galaxies
Abstract:
We present the X-ray point-source catalog produced from the Chandra
Advanced CCD Imaging Spectrometer (ACIS-I) observations of the
combined ∼3.2deg2 DEEP2 (XDEEP2) survey fields, which consist of
four ∼0.7-1.1deg2 fields. The combined total exposures across all
four XDEEP2 fields range from ∼10ks to 1.1Ms. We detect X-ray point
sources in both the individual ACIS-I observations and the overlapping
regions in the merged (stacked) images. We find a total of 2976 unique
X-ray sources within the survey area with an expected false-source
contamination of ∼30 sources (≲1%). Additionally, we present a
Bayesian-style method for associating the X-ray sources with optical
photometric counterparts in the DEEP2 catalog (complete to RAB<25.2)
and find that 2126 (∼71.4%±2.8%) of the 2976 X-ray sources presented
here have a secure optical counterpart with a ≲6% contamination
fraction. We provide the DEEP2 optical source properties (e.g.,
magnitude, redshift) as part of the X-ray-optical counterpart catalog.
Description:
The catalog presented here was derived from multi-epoch observations
taken during AO3 (PI: K. Nandra), AO6, and AO9, combined with
Guaranteed Time Observations (PI: S. Murray; AO9). All Chandra
observations for XDEEP2 are publicly available through the Chandra
X-Ray Center (CXC) Archive. In Table 2 we provide the individual
pointing details for each observation and field.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 80 137 Observation log
table5.dat 271 2976 XDEEP2 source catalog
table7.dat 96 2976 XDEEP2 X-ray-optical counterpart catalog
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See also:
II/301 : The DEEP2-DR1 Photometric Catalog (Coil+ 2004)
B/chandra : The Chandra Archive Log (CXC, 1999-2012)
J/ApJS/193/13 : Spitzer/IRAC sources in the EGS I. SEDs (Barro+, 2011)
J/ApJ/728/38 : AEGIS: demographics of X-ray and optical AGN (Yan+, 2011)
J/ApJ/717/1181 : Spitzer power-law galaxies in EGS (Park+, 2010)
J/ApJS/180/102 : AEGIS-X: Chandra deep survey (Laird+, 2009)
J/ApJ/654/115 : DEEP2 Galaxy Redshift Survey: SDSS QSOs (Coil+, 2007)
J/MNRAS/377/806 : Tully-Fisher relation of DEEP2 galaxies (Chiu+, 2007)
J/ApJ/625/6 : Galaxy groups in the DEEP2 GRS (Gerke+, 2005)
http://deep.ps.uci.edu/ : DEEP2 Redshift Survey web page
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1 I1 --- F [1/4] XDEEP2 Field number
3- 7 I5 --- ObsID Chandra observation identification number (1)
9- 15 A7 --- sField Sub-Field ID (EGS-N or AEGIS-N) (2)
17- 21 A5 --- sField2 Other sub-Field ID (EGS-N) (2)
23- 32 A10 "YYYY/MM/DD" Obs.date Observing date (UT)
34- 41 A8 "h:m:s" Obs.time Observing start time (UT)
43- 47 F5.2 ks Exp Exposure time after appropriate screening
49- 57 F9.5 deg RAdeg Right ascension in decimal degrees (J2000)
59- 66 F8.5 deg DEdeg Declination in decimal degrees (J2000)
68- 73 F6.2 deg Roll Spacecraft roll angle in the standard
north-east coordinate system
75- 80 A6 --- Mode Chandra observing mode (FAINT or VFAINT)
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Note (1): Due to missing gain files within the CALDB, ObsID 6221 is not
included in the analyses of Field 1 which are presented here. The
exposure time of 6221 is only 4.15ks, hence, its rejection is
relatively insignificant compared to the total exposure time within
Field 1 and will have a negligible effect on our conclusions.
Note (2): Sub-field name for observations in Field 1, adopted from Laird
et al. (2009, Cat. J/ApJS/180/102).
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Unique XDEEP2 source identifier (FN_NNNN,
aegN_NNNN or egsN_NNNN)
11- 17 A7 --- Obs DEEP2 ObsID/sub-field
19- 21 A3 --- --- [CXO]
23- 38 A16 --- CXO Chandra source catalog ID (JHHMMSS.s+DDMMSS) (1)
40- 48 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000) (2)
50- 57 F8.5 deg DEdeg Declination in decimal degrees (J2000) (2)
59- 62 F4.2 arcsec ePos [0.02/4.1] Centroid positional error
64- 67 F4.2 arcsec R50 Radius at 50% ACIS-I effective area (3)
69- 73 F5.2 arcsec R90 Radius at 90% ACIS-I effective area (3)
75- 80 F6.2 arcsec DOA Off-axis distance (4)
82- 88 F7.2 ct S50 Net soft (0.5-2keV) counts in R50
89 A1 --- l_S50 [u] u: 3σ upper-limit
90- 94 F5.2 ct e_S50 ? Uncertainty in S50
96-102 F7.2 ct S90 Net soft (0.5-2keV) counts in R90
103 A1 --- l_S90 [u] u: 3σ upper-limit
104-108 F5.2 ct e_S90 ? Uncertainty in S90
110-116 F7.2 ct H50 Net hard (2-7keV) counts in R50
117 A1 --- l_H50 [u] u: 3σ upper-limit
118-122 F5.2 ct e_H50 ? Uncertainty in H50
124-130 F7.2 ct H90 Net hard (2-7keV) counts in R90
131 A1 --- l_H90 [u] u: 3σ upper-limit
132-136 F5.2 ct e_H90 ? Uncertainty in H90
138-144 F7.2 ct F50 Net full (0.5-7keV) counts in R50
145 A1 --- l_F50 [u] u: 3σ upper-limit
146-150 F5.2 ct e_F50 ? Uncertainty in F50
152-159 F8.2 ct F90 Net full (0.5-7keV) counts in R90
161-166 F6.2 ct e_F90 ?=-1 Uncertainty in F90
168-176 E9.2 mW/m2 SF Soft (0.5-2keV) flux; erg/s/cm2
178-186 E9.2 mW/m2 e_SF ?=-1 Uncertainty in SF
188-196 E9.2 mW/m2 HF Hard (2-7keV) flux; erg/s/cm2
198-206 E9.2 mW/m2 e_HF ?=-1 Uncertainty in HF
208-216 E9.2 mW/m2 FF Full (0.5-7keV) flux; erg/s/cm2
217 A1 --- l_FF [u] u: 3σ upper-limit
218-226 E9.2 mW/m2 e_FF ? Uncertainty in FF
228-232 F5.2 --- HR Hardness ratio; (H-S)/(H+S)
234-238 F5.2 --- b_HR Lower 1σ limit uncertainty in HR
240-244 F5.2 --- B_HR Upper 1σ limit uncertainty in HR
246-253 F8.2 --- FR Flux ratio; HF/SF
255-260 F6.2 --- e_FR ?=-1 Lower 1σ limit uncertainty in FR
262-271 F10.2 --- E_FR ?=-1 Upper 1σ limit uncertainty in FR
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Note (1): For matched XDEEP2 sources in the Chandra X-ray source catalog (CSC;
Evans et al. 2010ApJS..189...37E 2010ApJS..189...37E).
Note (2): Of X-ray position.
Note (3): Given the off-axis distance of the X-ray source.
Note (4): Of X-ray source from aim-point of observations.
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Unique XDEEP2 source identifier (FN_NNNN,
aegN_NNNN or egsN_NNNN)
11 I1 --- F [1/4] DEEP2 ObsID/sub-field
13- 21 F9.5 deg RAdeg X-ray Right Ascension in decimal degrees (J2000)
23- 30 F8.5 deg DEdeg X-ray Declination in decimal degrees (J2000)
32- 39 I8 --- DEEP2 [11006189/43057031]? DEEP2 optical source number
(Coil et al. 2004ApJ...617..765C 2004ApJ...617..765C, Cat. II/301,
<DEEP2-GRS NNNNNNNN> in Simbad)
41- 49 F9.5 deg RAOdeg ? Optical Right Ascension in decimal degrees
(J2000)
51- 58 F8.5 deg DEOdeg ? Optical Declination in decimal degrees (J2000)
60- 63 F4.2 arcsec dOX ? Angular separation between optical and X-ray
65- 71 F7.4 --- z ? Optical counterpart redshift
73- 77 F5.2 % Pgal [-2/3]? Probability of being a galaxy (5)
80- 84 F5.2 mag Bmag ? B band AB magnitude
86- 90 F5.2 mag Rmag ? R band AB magnitude
92- 96 F5.2 mag Imag ? I band AB magnitude
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Note (5): Bayesian probability of being a galaxy based on R-band image:
* a value between 0 and 1 gives the probability that a compact object is
a galaxy (see Coil et al. 2004ApJ...617..765C 2004ApJ...617..765C)
* a value ≤0 indicates a star or compact object;
* a value ≥1 indicates an extended source and definitely a galaxy.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 17-Oct-2012