J/ApJS/139/369 Chandra Deep Field South. 1 Ms catalog (Giacconi+, 2002)
Chandra Deep Field South: the 1 Ms catalog.
Giacconi R., Zirm A., Wang J., Rosati P., Nonino M., Tozzi P., Gilli R.,
Mainieri V., Hasinger G., Kewley L., Bergeron J., Borgani S., Gilmozzi R.,
Grogin N., Koekemoer A., Schreier E., Zheng W., Norman C.
<Astrophys. J. Suppl. Ser. 139, 369 (2002)>
=2002ApJS..139..369G 2002ApJS..139..369G
ADC_Keywords: Surveys ; X-ray sources
Keywords: catalogs - galaxies: active - galaxies: high-redshift -
X-rays: diffuse background - X-rays: galaxies
Abstract:
In this paper we present the source catalog obtained from a 942ks
exposure of the Chandra Deep Field South (CDFS), using the Advanced
CCD Imaging Spectrometer (ACIS-I) on the Chandra X-ray Observatory.
Eleven individual pointings made between 1999 October and 2000
December were combined to generate the final image used for object
detection. Catalog generation proceeded simultaneously using two
different methods: a method of our own design using a modified version
of the SExtractor algorithm, and a wavelet transform technique
developed specifically for Chandra observations. The detection
threshold has been set in order to have less than 10 spurious sources,
as assessed by extensive simulations. We subdivided the catalog into
four sections: the primary list consisting of objects common to the
two detection methods, two secondary lists containing sources which
were detected by (1) the SExtractor algorithm alone and (2) the
wavelet technique alone, and the fourth list consisting of possible
diffuse or extended sources. The flux limits at the aimpoint for the
soft (0.5-2keV) and hard (2-10keV) bands are 5.5x10-17erg/s/cm2
and 4.5x10-16erg/s/cm2, respectively. The total number of sources
is 346; out of them, 307 were detected in the 0.5-2keV band, and 251
in the 2-10keV band.
We also present optical identifications for the catalogued sources.
Our primary optical data are R band imaging from VLT/FORS1 to a depth
of R∼26.5 (Vega). In regions of the field not covered by the VLT/FORS1
deep imaging, we use R-band data obtained with the Wide Field Imager
(WFI) on the ESO-MPI 2.2 m telescope, as part of the ESO Imaging
Survey (EIS), which cover the entire X-ray survey. We found that the
FORS1/Chandra offsets are small, ∼1". Coordinate cross-correlation
finds 85% of the Chandra sources covered by FORS1 R to have
counterparts within the 3σ error box (≳1.5" depending on
off-axis angle and X-ray signal-to-noise). The unidentified fraction
of sources, approximately ∼10%-15%, is close to the limit expected
from the observed X-ray flux to R-band ratio distribution for the
identified sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 178 339 Main Catalog
table3.dat 178 34 SExtractor Only
table4.dat 178 17 Wavdetect Only
table5.dat 57 19 Extended Sources
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See also:
http://cxc.harvard.edu/ : the Chandra Home Page
J/AJ/122/2810 : Chandra Deep Field North Survey. V. (Brandt+, 2001)
J/A+A/375/1 : IR obs. of Chandra Deep Field + HDF-South (Saracco+, 2001)
J/A+A/377/442 : Chandra Deep Field South: R-band photometry (Wolf+, 2001)
Byte-by-byte Description of file: table2.dat table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID Optical cutout identification number (1)
5- 7 I3 --- [GZW2002] Unique Detection identification number,
[GZW2002] XID NNN in Simbad
9- 33 A25 --- Name The IAU Registered Name (2)
35- 36 I2 h RAh Hour of Right Ascension (J2000) (3)
38- 39 I2 min RAm Minute of Right Ascension (J2000) (3)
41- 45 F5.2 s RAs Second of Right Ascension (J2000) (3)
47 A1 --- DE- Sign of the Declination (J2000) (4)
48- 49 I2 deg DEd Degree of Declination (J2000) (4)
51- 52 I2 arcmin DEm Arcminute of Declination (J2000) (4)
54- 58 F5.2 arcsec DEs Arcsecond of Declination (J2000) (4)
60- 66 F7.2 ct SCts ? Net soft (0.5-2keV) band counts
68- 71 F4.1 ct e_SCts ? Error in SCts
73- 79 F7.2 ct HCts ? Net hard (2-10keV) band counts
81- 84 F4.1 ct e_HCts ? Error in HCts
86- 90 F5.1 ks STime Soft band exposure time
92- 96 F5.1 ks HTime Hard band exposure time
98 A1 --- l_SFlux Limit flag on SFlux
99-106 E8.2 mW/m2 SFlux Soft band flux in units of erg/cm2/s
108-115 E8.2 mW/m2 e_SFlux ? Error in SFlux
117 A1 --- l_HFlux Limit flag on HFlux
118-125 E8.2 mW/m2 HFlux Hard band flux in units of erg/cm2/s
127-134 E8.2 mW/m2 e_HFlux ? Error in HFlux
136-140 F5.2 --- HR Hardness ratio (5)
142-145 F4.2 --- e_HR Error in HR
147-150 F4.2 arcsec PosErr Error on the X-ray source position as
calculated in the text
152-155 F4.2 arcsec Sep ? Separation of the candidate optical
counterpart
157 A1 --- l_Rmag Limit flag on Rmag
158-162 F5.2 mag Rmag Vega R magnitude for the optical counterpart
164-167 F4.2 mag e_Rmag ? Error on Rmag
169 A1 --- f_Rmag [WF] Filter of the Rmag observation (6)
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Note (1): In order of RA. Internal number for each table:
Table 2: <[GZW2002] Main NNN> in Simbad
Table 3: <[GZW2002] SExtractor NN> in Simbad
Table 4: <[GZW2002] WAVDETECT NN> in Simbad
Note (2): Based on original (not offset) X-ray coordinates.
Objects identified as CXOCDFS JHHMMSS.s+DDMMSS in Simbad
Note (3): Offset from CHANDRA by -1.2"
Note (4): Offset from CHANDRA by 0.8"
Note (5): Defined as HR=(H-S)/(H+S) where H and S are the net counts
in the hard and soft bands respectively.
Note (6): Filters:
F = FORS filter
W = WFI filter
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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- 3 I3 --- [GZW2002] Unique Detection identification number,
[GZW2002] XID NNN in Simbad
5- 6 I2 h RAh Right ascension (J2000)
8- 9 I2 min RAm Right ascension (J2000)
11- 15 F5.2 s RAs Right ascension (J2000)
17 A1 --- DE- Declination sign (J2000)
18- 19 I2 deg DEd Declination (J2000)
21- 22 I2 arcmin DEm Declination (J2000)
24- 28 F5.2 arcsec DEs Declination (J2000)
30- 34 F5.1 ct SCts Soft (0.5-2keV) counts
36- 43 E8.2 mW/m2 SFlux Soft band flux in units of erg/cm2/s
45- 48 F4.1 --- S/Nsoft Signal-to-noise ratio in the soft band
50- 52 F3.1 arcsec FWHM ? FWHM of the best fit Gaussian profile
54- 57 F4.2 arcmin OffAxis Off-axis angle
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History:
From electronic version of the journal
* 27-May-2002: table2: CXO CDFS J033230.2-28022
corrected into CXO CDFS J033230.2-280202
* 02-Jul-2002: table2: CXO CDFS J033230.2-28022
corrected into CXO CDFS J033230.2-280022 (From Dr. Stephen A. Drake)
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 22-Apr-2002