TY - JOUR
T1 - The Chandra COSMOS Survey. I. overview and point source catalog
AU - Elvis, Martin
AU - Civano, Francesca
AU - Vignali, Cristian
AU - Puccetti, Simonetta
AU - Fiore, Fabrizio
AU - Cappelluti, Nico
AU - Aldcroft, T. L.
AU - Fruscione, Antonella
AU - Zamorani, G.
AU - Comastri, Andrea
AU - Brusa, Marcella
AU - Gilli, Roberto
AU - Miyaji, Takamitsu
AU - Damiani, Francesco
AU - Koekemoer, Anton M.
AU - Finoguenov, Alexis
AU - Brunner, Hermann
AU - Urry, C. M.
AU - Silverman, John
AU - Mainieri, Vincenzo
AU - Hasinger, Guenther
AU - Griffiths, Richard
AU - Carollo, Marcella
AU - Hao, Heng
AU - Guzzo, Luigi
AU - Blain, Andrew
AU - Calzetti, Daniela
AU - Carilli, C.
AU - Capak, Peter
AU - Ettori, Stefano
AU - Fabbiano, Giuseppina
AU - Impey, Chris
AU - Lilly, Simon
AU - Mobasher, Bahram
AU - Rich, Michael
AU - Salvato, Mara
AU - Sanders, D. B.
AU - Schinnerer, Eva
AU - Scoville, N.
AU - Shopbell, Patrick
AU - Taylor, James E.
AU - Taniguchi, Yoshiaki
AU - Volonteri, Marta
PY - 2009
Y1 - 2009
N2 - The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8 Ms, Chandra program that has imaged the central 0.5 deg2 of the COSMOS field (centered at 10h, +02o) with an effective exposure of ∼160 ks, and an outer 0.4 deg2 area with an effective exposure of ∼80 ks. The limiting source detection depths are 1.9 × 10-16 erg cm -2 s-1 in the soft (0.5-2 keV) band, 7.3 × 10 -16 erg cm-2 s-1 in the hard (2-10 keV) band, and 5.7 × 10-16 erg cm-2 s-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 × 10-5 (1655 in the full, 1340 in the soft, and 1017 in the hard bands). By using a grid of 36 heavily (∼50%) overlapping pointing positions with the ACIS-I imager, a remarkably uniform (12%) exposure across the inner 0.5 deg2 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.
AB - The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8 Ms, Chandra program that has imaged the central 0.5 deg2 of the COSMOS field (centered at 10h, +02o) with an effective exposure of ∼160 ks, and an outer 0.4 deg2 area with an effective exposure of ∼80 ks. The limiting source detection depths are 1.9 × 10-16 erg cm -2 s-1 in the soft (0.5-2 keV) band, 7.3 × 10 -16 erg cm-2 s-1 in the hard (2-10 keV) band, and 5.7 × 10-16 erg cm-2 s-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 × 10-5 (1655 in the full, 1340 in the soft, and 1017 in the hard bands). By using a grid of 36 heavily (∼50%) overlapping pointing positions with the ACIS-I imager, a remarkably uniform (12%) exposure across the inner 0.5 deg2 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.
KW - Catalogs
KW - Cosmology: observations
KW - Galaxies: evolution
KW - Quasars: general
KW - Surveys
KW - X-rays: general
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U2 - 10.1088/0067-0049/184/1/158
DO - 10.1088/0067-0049/184/1/158
M3 - Article
AN - SCOPUS:70549105591
VL - 184
SP - 158
EP - 171
JO - Astrophysical Journal, Supplement Series
JF - Astrophysical Journal, Supplement Series
SN - 0067-0049
IS - 1
ER -