Journal or Book Title
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
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 10 h , +02 o ) 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.
Elvis, M; Civano, F; Vignali, C; Puccetti, S; Fiore, F; Cappelluti, N; Aldcroft, TL; Fruscione, A; Zamorani, G; Comastri, A; Brusa, M; Gilli, R; Miyaji, T; Damiani, F; Koekemoer, AM; Finoguenov, A; Brunner, H; Urry, CM; Silverman, J; Mainieri, V; Hasinger, G; Griffiths, R; Carollo, M; Hao, H; Guzzo, L; Blain, A; Calzetti, D; Carilli, C; Capak, P; Ettori, S; Fabbiano, G; Impey, C; Lilly, S; Mobasher, B; Rich, M; Salvato, M; Sanders, DB; Schinnerer, E; Scoville, N; Shopbell, P; Taylor, JE; Taniguchi, Y; and Volonteri, M, "THE CHANDRA COSMOS SURVEY. I. OVERVIEW AND POINT SOURCE CATALOG" (2009). ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES. 135.