THE CHANDRA COSMOS SURVEY. I. OVERVIEW AND POINT SOURCE CATALOG

Journal Article · Tue Sep 01 00:00:00 EDT 2009 · Astrophysical Journal, Supplement Series

DOI:https://doi.org/10.1088/0067-0049/184/1/158; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)· OSTI ID:21301595

Elvis, Martin; Civano, Francesca; Aldcroft, T L; Fruscione, Antonella ^[1]; Vignali, Cristian ^[2]; Puccetti, Simonetta ^[3]; Fiore, Fabrizio ^[4]; Cappelluti, Nico; Brusa, Marcella; Finoguenov, Alexis; Brunner, Hermann ^[5]; Zamorani, G; Comastri, Andrea; Gilli, Roberto ^[6]; Miyaji, Takamitsu ^[7]; Damiani, Francesco ^[8]; Koekemoer, Anton M ^[9]; Urry, C M ^[10]; Silverman, John ^[11]; Mainieri, Vincenzo ^[12]

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1. Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 (United States)
2. Dipartimento di Astronomia, Universita degli Studi di Bologna, Via Ranzani 1, I-40127 Bologna (Italy)
3. ASI Science Data Center, via Galileo Galilei, 00044 Frascati (Italy)
4. INAF-Osservatorio astronomico di Roma, Via Frascati 33, 00040 Monteporzio Catone (Italy)
5. Max-Planck-Institute fuer Extraterrestrische Physik, Postfach 1312, 85741, Garching bei Muenchen (Germany)
6. INAF-Osservatorio Astronomico di Bologna, Via Ranzani 1, I-40127 Bologna (Italy)
7. Instituto de AstronomIa, Universidad Nacional Autonoma de Mexico, Ensenada (Mexico)
8. INAF-Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, I-90134 Palermo (Italy)
9. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)
10. Department of Physics and Yale Center for Astronomy and Astrophysics, Yale University, P.O. Box 208121, New Haven, CT 06520-8121 (United States)
11. Department of Physics, Eidgenoessische Technische Hochschule-Zurich, CH-8093 Zurich (Switzerland)
12. ESO, Karl-Schwarschild-Strasse 2, D-85748 Garching (Germany)

The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8 Ms, Chandra program that has imaged the central 0.5 deg{sup 2} of the COSMOS field (centered at 10 {sup h}, +02 deg.) with an effective exposure of {approx}160 ks, and an outer 0.4 deg{sup 2} area with an effective exposure of {approx}80 ks. The limiting source detection depths are 1.9 x 10{sup -16} erg cm{sup -2} s{sup -1} in the soft (0.5-2 keV) band, 7.3 x 10{sup -16} erg cm{sup -2} s{sup -1} in the hard (2-10 keV) band, and 5.7 x 10{sup -16} erg cm{sup -2} s{sup -1} in the full (0.5-10 keV) band. Here we describe the strategy, design, and execution of the C-COSMOS survey, and present the catalog of 1761 point sources detected at a probability of being spurious of <2 x 10{sup -5} (1655 in the full, 1340 in the soft, and 1017 in the hard bands). By using a grid of 36 heavily ({approx}50%) overlapping pointing positions with the ACIS-I imager, a remarkably uniform ({+-}12%) exposure across the inner 0.5 deg{sup 2} field was obtained, leading to a sharply defined lower flux limit. The widely different point-spread functions obtained in each exposure at each point in the field required a novel source detection method, because of the overlapping tiling strategy, which is described in a companion paper. This method produced reliable sources down to a 7-12 counts, as verified by the resulting logN-logS curve, with subarcsecond positions, enabling optical and infrared identifications of virtually all sources, as reported in a second companion paper. The full catalog is described here in detail and is available online.

• OSTI ID: 21301595
• Journal Information: Astrophysical Journal, Supplement Series, Vol. 184, Issue 1; Other Information: DOI: 10.1088/0067-0049/184/1/158; Country of input: International Atomic Energy Agency (IAEA); ISSN 0067-0049
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
CATALOGS
COSMOLOGY
GALACTIC EVOLUTION
GALAXIES
POINT SOURCES
QUASARS
UNIVERSE
X RADIATION