J/AJ/131/2373 Extended Chandra Deep Field-South survey (Virani+, 2006)
The extended Chandra Deep Field-South survey: X-ray point-source catalog.
Virani S.N., Treister E., Urry C.M., Gawiser E.
<Astron. J., 131, 2373-2382 (2006)>
=2006AJ....131.2373V 2006AJ....131.2373V
ADC_Keywords: X-ray sources ; Surveys ; Active gal. nuclei
Keywords: cosmology: observations - diffuse radiation - galaxies: active -
surveys - X-rays: galaxies - X-rays: general
Abstract:
The Extended Chandra Deep Field-South (ECDFS) survey consists of four
Chandra X-Ray Observatory ACIS-I pointings and covers ∼1100arcmin2
(∼0.3°2) centered on the original CDF-S field to a depth of
approximately 228ks. This is the largest Chandra survey ever conducted
at such depth, and only one XMM-Newton survey reaches a lower flux
limit in the hard 2.0-8.0keV band. We detect 651 unique sources: 587
using a conservative source-detection threshold and 64 using a lower
source-detection threshold. These are presented as two separate
catalogs. Of the 651 total sources, 561 are detected in the full
0.5-8.0keV band, 529 in the soft 0.5-2.0keV band, and 335 in the hard
2.0-8.0keV band. For point sources near the aim point, the limiting
fluxes are approximately 1.7x10-16 and 3.9x10-16ergs/cm2/s in
the 0.5-2.0 and 2.0-8.0keV bands, respectively. Using simulations, we
determine the catalog completeness as a function of flux and assess
uncertainties in the derived fluxes due to incomplete spectral
information. We present the differential and cumulative flux
distributions, which are in good agreement with the number counts from
previous deep X-ray surveys and with the predictions from an active
galactic nucleus (AGN) population synthesis model that can explain the
X-ray background. In general, fainter sources have harder X-ray
spectra, consistent with the hypothesis that these sources are mainly
obscured AGNs.
Description:
All nine observations of the ECDFS survey field were conducted with
the Advanced CCD Imaging Spectrometer (ACIS) on board Chandra as part
of the approved guest observer program in Cycle 5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 163 587 Primary catalog of X-ray sources in the ECDFS
field (false positive detection≤1e-7)
table5.dat 163 64 Secondary catalog of X-ray sources in the ECDFS
field (false positive detection≤1e-6)
table6.dat 56 70 Catalog of collapsed Wavdetect X-ray sources in
the ECDFS Survey
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See also:
J/AJ/126/539 : The Chandra Deep Fields North and South (Alexander+, 2003)
J/ApJS/161/21 : Extended Chandra Deep Field-South survey (Lehmer+, 2005)
J/ApJ/595/685 : HST imaging in Chandra Deep Field-South (Grogin+, 2003)
J/ApJS/139/369 : Chandra Deep Field South. 1 Ms catalog (Giacconi+, 2002)
Byte-by-byte Description of file: table4.dat table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 3 I3 --- [VTU2006] Unique identification number
([VTU2006] NNN in Simbad)
5- 20 A16 --- CXOYECDF IAU-registered name
(CXOYECDF JHHMMSS.s+DDMMSS in Simbad)
22- 23 I2 h RAh Hour of Right Ascension (J2000)
25- 26 I2 min RAm Minute of Right Ascension (J2000)
28- 32 F5.2 s RAs Second of Right Ascension (J2000)
34 A1 --- DE- Sign of Declination (J2000)
35- 36 I2 deg DEd Degree of Declination (J2000)
38- 39 I2 arcmin DEm Arcminute of Declination (J2000)
41- 44 F4.1 arcsec DEs Arcsecond of Declination (J2000)
46- 49 F4.2 arcsec PSF PSF size (1)
51- 58 E8.2 ct/s CRf ? Full (0.5-8keV) count rate (2)
60- 67 E8.2 ct/s E_CRf ? Full (0.5-8keV) count rate upper limit (3)
69- 76 E8.2 ct/s e_CRf ? Full (0.5-8keV) count rate lower limit (3)
78- 85 E8.2 ct/s CRs ? Soft (0.5-2keV) count rate (2)
87- 94 E8.2 ct/s E_CRs ? Soft (0.5-2keV) count rate upper limit (3)
96-103 E8.2 ct/s e_CRs ? Soft (0.5-2keV) count rate lower limit (3)
105-112 E8.2 ct/s CRh ? Hard (2-8keV) count rate (2)
114-121 E8.2 ct/s E_CRh ? Hard (2-8keV) count rate upper limit (3)
123-130 E8.2 ct/s e_CRh ? Hard (2-8keV) count rate lower limit (3)
132-139 E8.2 mW/m2 Ffull Full (0.5-8keV) flux (4)
141-148 E8.2 mW/m2 Fsoft Soft (0.5-2keV) flux (4)
150-157 E8.2 mW/m2 Fhard Hard (2-8keV) flux (4)
159-163 A5 --- Notes Notes (5)
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Note (1): In units of arcseconds and as reported by wavdetect for each
detect-cell.
Note (2): In units of cts/s and derived using the appropriate band exposure
map. The count rates are exposure and contamination corrected.
Note (3): Calculated following the prescription in Gehrels
(1986ApJ...303..336G 1986ApJ...303..336G) for an 84% confidence level.
Note (4): In units of ergs/s/cm2. Corrected for absorption by the Galaxy
and calculated assuming a photon slope of 1.4 The fluxes are exposure
and contamination corrected.
Note (5): Indicates whether the source was reported in the CDF-S catalog of
Alexander et al. (2003, Cat. J/AJ/126/539) in which case the catalog
ID is reported, and/or if the source was selected from a band other
than the full band (ie, 'h' or 's') or only detected in the full band
('f').
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Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- [VTU2006] Unique identification number
([VTU2006] Collapsed NN in Simbad)
5- 20 A16 --- CXOYECDF IAU-registered name (JHHMMSS.s+DDMMSS)
(CXOYECDF JHHMMSS.s+DDMMSS in Simbad)
22- 23 I2 h RAh Hour of Right Ascension (J2000)
25- 26 I2 min RAm Minute of Right Ascension (J2000)
28- 32 F5.2 s RAs Second of Right Ascension (J2000)
34 A1 --- DE- Sign of Declination (J2000)
35- 36 I2 deg DEd Degree of Declination (J2000)
38- 39 I2 arcmin DEm Arcminute of Declination (J2000)
41- 45 F5.2 arcsec DEs Arcsecond of Declination (J2000)
47- 56 A10 --- Notes Notes (1)
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Note (1): Indicates which band(s) the source was detected.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 31-Jul-2007