The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8 Ms, Chandra program that has imaged the central 0.5 deg2of the COSMOS field (centered at 10h, +02o) with an effective exposure of ∼160 ks, and an outer 0.4 deg2area with an effective exposure of ∼80 ks. The limiting source detection depths are 1.9 × 10-16erg cm-2s-1in the soft (0.5-2 keV) band, 7.3 × 10-16erg cm-2s-1in the hard (2-10 keV) band, and 5.7 × 10-16erg cm-2s-1in 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 deg2field 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.

The Chandra COSMOS Survey. I. overview and point source catalog / M. Elvis, F. Civano, C. Vignali, S. Puccetti, F. Fiore, N. Cappelluti, T.L. Aldcroft, A. Fruscione, G. Zamorani, A. Comastri, M. Brusa, R. Gilli, T. Miyaji, F. Damiani, A.M. Koekemoer, A. Finoguenov, H. Brunner, C.M. Urry, J. Silverman, V. Mainieri, G. Hasinger, R. Griffiths, M. Carollo, H. Hao, L. Guzzo, A. Blain, D. Calzetti, C. Carilli, P. Capak, S. Ettori, G. Fabbiano, C. Impey, S. Lilly, B. Mobasher, M. Rich, M. Salvato, D.B. Sanders, E. Schinnerer, N. Scoville, P. Shopbell, J.E. Taylor, Y. Taniguchi, M. Volonteri. - In: ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES. - ISSN 0067-0049. - 184:1(2009), pp. 158-171. [10.1088/0067-0049/184/1/158]

The Chandra COSMOS Survey. I. overview and point source catalog

L. Guzzo;
2009

Abstract

The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8 Ms, Chandra program that has imaged the central 0.5 deg2of the COSMOS field (centered at 10h, +02o) with an effective exposure of ∼160 ks, and an outer 0.4 deg2area with an effective exposure of ∼80 ks. The limiting source detection depths are 1.9 × 10-16erg cm-2s-1in the soft (0.5-2 keV) band, 7.3 × 10-16erg cm-2s-1in the hard (2-10 keV) band, and 5.7 × 10-16erg cm-2s-1in 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 deg2field 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.
Catalogs; Cosmology: observations; Galaxies: evolution; Quasars: general; Surveys; X-rays: general; Astronomy and Astrophysics; Space and Planetary Science
Settore FIS/05 - Astronomia e Astrofisica
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/555984
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