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

Martin Elvis, Francesca Civano, Cristian Vignali, Simonetta Puccetti, Fabrizio Fiore, Nico Cappelluti, T. L. Aldcroft, Antonella Fruscione, G. Zamorani, Andrea Comastri, Marcella Brusa, Roberto Gilli, Takamitsu Miyaji, Francesco Damiani, Anton M. Koekemoer, Alexis Finoguenov, Hermann Brunner, C. M. Urry, John Silverman, Vincenzo MainieriGuenther Hasinger, Richard Griffiths, Marcella Carollo, Heng Hao, Luigi Guzzo, Andrew Blain, Daniela Calzetti, C. Carilli, Peter Capak, Stefano Ettori, Giuseppina Fabbiano, Christopher D Impey, Simon Lilly, Bahram Mobasher, Michael Rich, Mara Salvato, D. B. Sanders, Eva Schinnerer, N. Scoville, Patrick Shopbell, James E. Taylor, Yoshiaki Taniguchi, Marta Volonteri

Research output: Contribution to journalArticle

321 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)158-171
Number of pages14
JournalAstrophysical Journal, Supplement Series
Volume184
Issue number1
DOIs
StatePublished - 2009

Fingerprint

point sources
catalogs
point source
erg
point spread functions
detection method
grids
COSMOS
exposure
curves

Keywords

  • Catalogs
  • Cosmology: observations
  • Galaxies: evolution
  • Quasars: general
  • Surveys
  • X-rays: general

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Elvis, M., Civano, F., Vignali, C., Puccetti, S., Fiore, F., Cappelluti, N., ... Volonteri, M. (2009). The Chandra COSMOS Survey. I. overview and point source catalog. Astrophysical Journal, Supplement Series, 184(1), 158-171. https://doi.org/10.1088/0067-0049/184/1/158

The Chandra COSMOS Survey. I. overview and point source catalog. / Elvis, Martin; Civano, Francesca; Vignali, Cristian; Puccetti, Simonetta; Fiore, Fabrizio; Cappelluti, Nico; Aldcroft, T. L.; Fruscione, Antonella; Zamorani, G.; Comastri, Andrea; Brusa, Marcella; Gilli, Roberto; Miyaji, Takamitsu; Damiani, Francesco; Koekemoer, Anton M.; Finoguenov, Alexis; Brunner, Hermann; Urry, C. M.; Silverman, John; Mainieri, Vincenzo; Hasinger, Guenther; Griffiths, Richard; Carollo, Marcella; Hao, Heng; Guzzo, Luigi; Blain, Andrew; Calzetti, Daniela; Carilli, C.; Capak, Peter; Ettori, Stefano; Fabbiano, Giuseppina; Impey, Christopher D; Lilly, Simon; Mobasher, Bahram; Rich, Michael; Salvato, Mara; Sanders, D. B.; Schinnerer, Eva; Scoville, N.; Shopbell, Patrick; Taylor, James E.; Taniguchi, Yoshiaki; Volonteri, Marta.

In: Astrophysical Journal, Supplement Series, Vol. 184, No. 1, 2009, p. 158-171.

Research output: Contribution to journalArticle

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, CD, Lilly, S, Mobasher, B, Rich, M, Salvato, M, Sanders, DB, Schinnerer, E, Scoville, N, Shopbell, P, Taylor, JE, Taniguchi, Y & Volonteri, M 2009, 'The Chandra COSMOS Survey. I. overview and point source catalog', Astrophysical Journal, Supplement Series, vol. 184, no. 1, pp. 158-171. https://doi.org/10.1088/0067-0049/184/1/158
Elvis, Martin ; Civano, Francesca ; Vignali, Cristian ; Puccetti, Simonetta ; Fiore, Fabrizio ; Cappelluti, Nico ; Aldcroft, T. L. ; Fruscione, Antonella ; Zamorani, G. ; Comastri, Andrea ; Brusa, Marcella ; Gilli, Roberto ; Miyaji, Takamitsu ; Damiani, Francesco ; Koekemoer, Anton M. ; Finoguenov, Alexis ; Brunner, Hermann ; Urry, C. M. ; Silverman, John ; Mainieri, Vincenzo ; Hasinger, Guenther ; Griffiths, Richard ; Carollo, Marcella ; Hao, Heng ; Guzzo, Luigi ; Blain, Andrew ; Calzetti, Daniela ; Carilli, C. ; Capak, Peter ; Ettori, Stefano ; Fabbiano, Giuseppina ; Impey, Christopher D ; Lilly, Simon ; Mobasher, Bahram ; Rich, Michael ; Salvato, Mara ; Sanders, D. B. ; Schinnerer, Eva ; Scoville, N. ; Shopbell, Patrick ; Taylor, James E. ; Taniguchi, Yoshiaki ; Volonteri, Marta. / The Chandra COSMOS Survey. I. overview and point source catalog. In: Astrophysical Journal, Supplement Series. 2009 ; Vol. 184, No. 1. pp. 158-171.
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abstract = "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.",
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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, Christopher D

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

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KW - Galaxies: evolution

KW - Quasars: general

KW - Surveys

KW - X-rays: general

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