THE CHANDRA COSMOS LEGACY SURVEY: OVERVIEW AND POINT SOURCE CATALOG

F. Civano; S. Marchesi; A. Comastri; M. C. Urry; M. Elvis; N. Cappelluti; S. Puccetti; M. Brusa; G. Zamorani; G. Hasinger; T. Aldcroft; D. M. Alexander; V. Allevato; H. Brunner; P. Capak; A. Finoguenov; F. Fiore; A. Fruscione; R. Gilli; K. Glotfelty; R. E. Griffiths; H. Hao; F. A. Harrison; K. Jahnke; J. Kartaltepe; A. Karim; S. M. Lamassa; G. Lanzuisi; T. Miyaji; P. Ranalli; M. Salvato; M. Sargent; N. J. Scoville; K. Schawinski; E. Schinnerer; J. Silverman; V. Smolcic; D. Stern; S. Toft; B. Trakhenbrot; E. Treister; C. Vignali

doi:10.3847/0004-637X/819/1/62

THE CHANDRA COSMOS LEGACY SURVEY: OVERVIEW AND POINT SOURCE CATALOG

F. Civano, S. Marchesi, A. Comastri, M. C. Urry, M. Elvis, N. Cappelluti, S. Puccetti, M. Brusa, G. Zamorani, G. Hasinger, T. Aldcroft, D. M. Alexander, V. Allevato, H. Brunner, P. Capak, A. Finoguenov, F. Fiore, A. Fruscione, R. Gilli, K. GlotfeltyR. E. Griffiths, H. Hao, F. A. Harrison, K. Jahnke, J. Kartaltepe, A. Karim, S. M. Lamassa, G. Lanzuisi, T. Miyaji, P. Ranalli, M. Salvato, M. Sargent, N. J. Scoville, K. Schawinski, E. Schinnerer, J. Silverman, V. Smolcic, D. Stern, S. Toft, B. Trakhenbrot, E. Treister, C. Vignali

Physics

Research output: Contribution to journal › Article

161 Scopus citations

Abstract

The COSMOS-Legacy survey is a 4.6 Ms Chandra program that has imaged 2.2 deg² of the COSMOS field with an effective exposure of ≃160 ks over the central 1.5 deg² and of ≃80 ks in the remaining area. The survey is the combination of 56 new observations obtained as an X-ray Visionary Project with the previous C-COSMOS survey. We describe the reduction and analysis of the new observations and the properties of 2273 point sources detected above a spurious probability of 2 × 10^-5. We also present the updated properties of the C-COSMOS sources detected in the new data. The whole survey includes 4016 point sources (3814, 2920 and 2440 in the full, soft, and hard band). The limiting depths are 2.2 × 10^-16, 1.5 × 10^-15, and 8.9 × 10^-16 in the 0.5-2, 2-10, and 0.5-10 keV bands, respectively. The observed fraction of obscured active galactic nuclei with a column density >10²² cm^-2 from the hardness ratio (HR) is ∼50_-16⁺¹⁷%. Given the large sample we compute source number counts in the hard and soft bands, significantly reducing the uncertainties of 5%-10%. For the first time we compute number counts for obscured (HR > -0.2) and unobscured (HR < -0.2) sources and find significant differences between the two populations in the soft band. Due to the unprecedent large exposure, COSMOS-Legacy area is three times larger than surveys at similar depths and its depth is three times fainter than surveys covering similar areas. The area-flux region occupied by COSMOS-Legacy is likely to remain unsurpassed for years to come.

Original language	English (US)
Article number	62
Journal	Astrophysical Journal
Volume	819
Issue number	1
DOIs	https://doi.org/10.3847/0004-637X/819/1/62
State	Published - Mar 1 2016

Keywords

X-rays: general
catalogs
cosmology: observations
galaxies: evolution
quasars: general
surveys

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Civano, F., Marchesi, S., Comastri, A., Urry, M. C., Elvis, M., Cappelluti, N., Puccetti, S., Brusa, M., Zamorani, G., Hasinger, G., Aldcroft, T., Alexander, D. M., Allevato, V., Brunner, H., Capak, P., Finoguenov, A., Fiore, F., Fruscione, A., Gilli, R., ... Vignali, C. (2016). THE CHANDRA COSMOS LEGACY SURVEY: OVERVIEW AND POINT SOURCE CATALOG. Astrophysical Journal, 819(1), [62]. https://doi.org/10.3847/0004-637X/819/1/62

THE CHANDRA COSMOS LEGACY SURVEY : OVERVIEW AND POINT SOURCE CATALOG. / Civano, F.; Marchesi, S.; Comastri, A.; Urry, M. C.; Elvis, M.; Cappelluti, N.; Puccetti, S.; Brusa, M.; Zamorani, G.; Hasinger, G.; Aldcroft, T.; Alexander, D. M.; Allevato, V.; Brunner, H.; Capak, P.; Finoguenov, A.; Fiore, F.; Fruscione, A.; Gilli, R.; Glotfelty, K.; Griffiths, R. E.; Hao, H.; Harrison, F. A.; Jahnke, K.; Kartaltepe, J.; Karim, A.; Lamassa, S. M.; Lanzuisi, G.; Miyaji, T.; Ranalli, P.; Salvato, M.; Sargent, M.; Scoville, N. J.; Schawinski, K.; Schinnerer, E.; Silverman, J.; Smolcic, V.; Stern, D.; Toft, S.; Trakhenbrot, B.; Treister, E.; Vignali, C.

In: Astrophysical Journal, Vol. 819, No. 1, 62, 01.03.2016.

Research output: Contribution to journal › Article

Civano, F, Marchesi, S, Comastri, A, Urry, MC, Elvis, M, Cappelluti, N, Puccetti, S, Brusa, M, Zamorani, G, Hasinger, G, Aldcroft, T, Alexander, DM, Allevato, V, Brunner, H, Capak, P, Finoguenov, A, Fiore, F, Fruscione, A, Gilli, R, Glotfelty, K, Griffiths, RE, Hao, H, Harrison, FA, Jahnke, K, Kartaltepe, J, Karim, A, Lamassa, SM, Lanzuisi, G, Miyaji, T, Ranalli, P, Salvato, M, Sargent, M, Scoville, NJ, Schawinski, K, Schinnerer, E, Silverman, J, Smolcic, V, Stern, D, Toft, S, Trakhenbrot, B, Treister, E & Vignali, C 2016, 'THE CHANDRA COSMOS LEGACY SURVEY: OVERVIEW AND POINT SOURCE CATALOG', Astrophysical Journal, vol. 819, no. 1, 62. https://doi.org/10.3847/0004-637X/819/1/62

Civano, F. ; Marchesi, S. ; Comastri, A. ; Urry, M. C. ; Elvis, M. ; Cappelluti, N. ; Puccetti, S. ; Brusa, M. ; Zamorani, G. ; Hasinger, G. ; Aldcroft, T. ; Alexander, D. M. ; Allevato, V. ; Brunner, H. ; Capak, P. ; Finoguenov, A. ; Fiore, F. ; Fruscione, A. ; Gilli, R. ; Glotfelty, K. ; Griffiths, R. E. ; Hao, H. ; Harrison, F. A. ; Jahnke, K. ; Kartaltepe, J. ; Karim, A. ; Lamassa, S. M. ; Lanzuisi, G. ; Miyaji, T. ; Ranalli, P. ; Salvato, M. ; Sargent, M. ; Scoville, N. J. ; Schawinski, K. ; Schinnerer, E. ; Silverman, J. ; Smolcic, V. ; Stern, D. ; Toft, S. ; Trakhenbrot, B. ; Treister, E. ; Vignali, C. / THE CHANDRA COSMOS LEGACY SURVEY : OVERVIEW AND POINT SOURCE CATALOG. In: Astrophysical Journal. 2016 ; Vol. 819, No. 1.

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abstract = "The COSMOS-Legacy survey is a 4.6 Ms Chandra program that has imaged 2.2 deg2 of the COSMOS field with an effective exposure of ≃160 ks over the central 1.5 deg2 and of ≃80 ks in the remaining area. The survey is the combination of 56 new observations obtained as an X-ray Visionary Project with the previous C-COSMOS survey. We describe the reduction and analysis of the new observations and the properties of 2273 point sources detected above a spurious probability of 2 × 10-5. We also present the updated properties of the C-COSMOS sources detected in the new data. The whole survey includes 4016 point sources (3814, 2920 and 2440 in the full, soft, and hard band). The limiting depths are 2.2 × 10-16, 1.5 × 10-15, and 8.9 × 10-16 in the 0.5-2, 2-10, and 0.5-10 keV bands, respectively. The observed fraction of obscured active galactic nuclei with a column density >1022 cm-2 from the hardness ratio (HR) is ∼50-16+17%. Given the large sample we compute source number counts in the hard and soft bands, significantly reducing the uncertainties of 5%-10%. For the first time we compute number counts for obscured (HR > -0.2) and unobscured (HR < -0.2) sources and find significant differences between the two populations in the soft band. Due to the unprecedent large exposure, COSMOS-Legacy area is three times larger than surveys at similar depths and its depth is three times fainter than surveys covering similar areas. The area-flux region occupied by COSMOS-Legacy is likely to remain unsurpassed for years to come.",

keywords = "X-rays: general, catalogs, cosmology: observations, galaxies: evolution, quasars: general, surveys",

author = "F. Civano and S. Marchesi and A. Comastri and Urry, {M. C.} and M. Elvis and N. Cappelluti and S. Puccetti and M. Brusa and G. Zamorani and G. Hasinger and T. Aldcroft and Alexander, {D. M.} and V. Allevato and H. Brunner and P. Capak and A. Finoguenov and F. Fiore and A. Fruscione and R. Gilli and K. Glotfelty and Griffiths, {R. E.} and H. Hao and Harrison, {F. A.} and K. Jahnke and J. Kartaltepe and A. Karim and Lamassa, {S. M.} and G. Lanzuisi and T. Miyaji and P. Ranalli and M. Salvato and M. Sargent and Scoville, {N. J.} and K. Schawinski and E. Schinnerer and J. Silverman and V. Smolcic and D. Stern and S. Toft and B. Trakhenbrot and E. Treister and C. Vignali",

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T2 - OVERVIEW AND POINT SOURCE CATALOG

AU - Civano, F.

AU - Marchesi, S.

AU - Comastri, A.

AU - Urry, M. C.

AU - Elvis, M.

AU - Cappelluti, N.

AU - Puccetti, S.

AU - Brusa, M.

AU - Zamorani, G.

AU - Hasinger, G.

AU - Aldcroft, T.

AU - Alexander, D. M.

AU - Allevato, V.

AU - Brunner, H.

AU - Capak, P.

AU - Finoguenov, A.

AU - Fiore, F.

AU - Fruscione, A.

AU - Gilli, R.

AU - Glotfelty, K.

AU - Griffiths, R. E.

AU - Hao, H.

AU - Harrison, F. A.

AU - Jahnke, K.

AU - Kartaltepe, J.

AU - Karim, A.

AU - Lamassa, S. M.

AU - Lanzuisi, G.

AU - Miyaji, T.

AU - Ranalli, P.

AU - Salvato, M.

AU - Sargent, M.

AU - Scoville, N. J.

AU - Schawinski, K.

AU - Schinnerer, E.

AU - Silverman, J.

AU - Smolcic, V.

AU - Stern, D.

AU - Toft, S.

AU - Trakhenbrot, B.

AU - Treister, E.

AU - Vignali, C.

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AB - The COSMOS-Legacy survey is a 4.6 Ms Chandra program that has imaged 2.2 deg2 of the COSMOS field with an effective exposure of ≃160 ks over the central 1.5 deg2 and of ≃80 ks in the remaining area. The survey is the combination of 56 new observations obtained as an X-ray Visionary Project with the previous C-COSMOS survey. We describe the reduction and analysis of the new observations and the properties of 2273 point sources detected above a spurious probability of 2 × 10-5. We also present the updated properties of the C-COSMOS sources detected in the new data. The whole survey includes 4016 point sources (3814, 2920 and 2440 in the full, soft, and hard band). The limiting depths are 2.2 × 10-16, 1.5 × 10-15, and 8.9 × 10-16 in the 0.5-2, 2-10, and 0.5-10 keV bands, respectively. The observed fraction of obscured active galactic nuclei with a column density >1022 cm-2 from the hardness ratio (HR) is ∼50-16+17%. Given the large sample we compute source number counts in the hard and soft bands, significantly reducing the uncertainties of 5%-10%. For the first time we compute number counts for obscured (HR > -0.2) and unobscured (HR < -0.2) sources and find significant differences between the two populations in the soft band. Due to the unprecedent large exposure, COSMOS-Legacy area is three times larger than surveys at similar depths and its depth is three times fainter than surveys covering similar areas. The area-flux region occupied by COSMOS-Legacy is likely to remain unsurpassed for years to come.

KW - X-rays: general

KW - catalogs

KW - cosmology: observations

KW - galaxies: evolution

KW - quasars: general

KW - surveys

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