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J/ApJS/195/10 The CDF-S survey: 4Ms source catalogs (Xue+, 2011)
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Beginning of ReadMe :J/ApJS/195/10 The CDF-S survey: 4Ms source catalogs (Xue+, 2011)
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The Chandra Deep Field-South survey: 4 Ms source catalogs.
Xue Y.Q., Luo B., Brandt W.N., Bauer F.E., Lehmer B.D., Broos P.S.,
Schneider D.P., Alexander D.M., Brusa M., Comastri A., Fabian A.C.,
Gilli R., Hasinger G., Hornschemeier A.E., Koekemoer A., Liu T.,
Mainieri V., Paolillo M., Rafferty D.A., Rosati P., Shemmer O.,
Silverman J.D., Smail I., Tozzi P., Vignali C.
<Astrophys. J. Suppl. Ser., 195, 10 (2011)>
=2011ApJS..195...10X
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ADC_Keywords: Cross identifications ; X-ray sources ; Surveys ; Redshifts ;
Magnitudes
Keywords: cosmology: observations - diffuse radiation - galaxies: active -
surveys - X-rays: galaxies
Abstract:
We present source catalogs for the 4Ms Chandra Deep Field-South
(CDF-S), which is the deepest Chandra survey to date and covers an
area of 464.5arcmin^2^. We provide a main Chandra source catalog,
which contains 740 X-ray sources that are detected with wavdetect at a
false-positive probability threshold of 10^-5^ in at least one of
three X-ray bands (0.5-8keV, full band; 0.5-2keV, soft band; and
2-8keV, hard band) and also satisfy a binomial-probability
source-selection criterion of P<0.004 (i.e., the probability of
sources not being real is less than 0.004); this approach is designed
to maximize the number of reliable sources detected. A total of 300
main-catalog sources are new compared to the previous 2Ms CDF-S
main-catalog sources. We determine X-ray source positions using
centroid and matched-filter techniques and obtain a median positional
uncertainty of 0.42". We also provide a supplementary catalog, which
consists of 36 sources that are detected with wavdetect at a
false-positive probability threshold of 10^-5^, satisfy the condition
of 0.004<P<0.1, and have an optical counterpart with R<24.
Multiwavelength identifications, basic optical/infrared/radio
photometry, and spectroscopic/photometric redshifts are provided for
the X-ray sources in the main and supplementary catalogs. Seven
hundred sixteen ( 97%) of the 740 main-catalog sources have
multiwavelength counterparts, with 673 ( 94% of 716) having either
spectroscopic or photometric redshifts. Basic analyses of the X-ray
and multiwavelength properties of the sources indicate that >75% of
the main-catalog sources are active galactic nuclei (AGNs); of the 300
new main-catalog sources, about 35% are likely normal and starburst
galaxies, reflecting the rise of normal and starburst galaxies at the
very faint flux levels uniquely accessible to the 4Ms CDF-S.
Description:
The 4Ms CDF-S consists of 54 observations, with the first 2Ms
exposure composed of 23 observations (taken between 1999 October 14
and 2000 December 23 and detailed in Luo et al., 2008, Cat.
J/ApJS/179/19) and the second 2Ms exposure composed of 31
observations (taken between 2010 March 18 and 2010 July 22).