THE CHANDRA COSMOS LEGACY SURVEY : OVERVIEW AND POINT SOURCE CATALOG

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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 , 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 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

Title: THE CHANDRA COSMOS LEGACY SURVEY : OVERVIEW AND POINT SOURCE CATALOG
Author: 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.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2016-03-01
Language: eng
Number of pages: 18
Belongs to series: Astrophysical Journal
ISSN: 0004-637X
URI: http://hdl.handle.net/10138/183630
Abstract: The COSMOS-Legacy survey is a 4.6 Ms Chandra program that has imaged 2.2 deg(2) of the COSMOS field with an effective exposure of similar or equal to 160 ks over the central 1.5 deg(2) and of similar or equal to 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 x 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 x 10(-16), 1.5 x 10(-15), and 8.9 x 10(-16) erg cm(-2) s(-1)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 >10(22) cm(-2) from the hardness ratio (HR) is similar to 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.
Subject: catalogs
cosmology: observations
galaxies: evolution
quasars: general
surveys
X-rays: general
WIDE-FIELD SURVEY
ACTIVE GALACTIC NUCLEI
EVOLUTION SURVEY COSMOS
MS SOURCE CATALOGS
X-RAY SURVEY
XMM-NEWTON
BLACK-HOLE
NUMBER COUNTS
STRIPE 82
LOG S
115 Astronomy, Space science
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