THE CHANDRA COSMOS LEGACY SURVEY : OPTICAL/IR IDENTIFICATIONS

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Marchesi , S , Civano , F , Elvis , M , Salvato , M , Brusa , M , Comastri , A , Gilli , R , Hasinger , G , Lanzuisi , G , Miyaji , T , Treister , E , Urry , C M , Vignali , C , Zamorani , G , Allevato , V , Cappelluti , N , Cardamone , C , Finoguenov , A , Griffiths , R E , Karim , A , Laigle , C , LaMassa , S M , Jahnke , K , Ranalli , P , Schawinski , K , Schinnerer , E , Silverman , J D , Smolcic , V , Suh , H & Trakhtenbrot , B 2016 , ' THE CHANDRA COSMOS LEGACY SURVEY : OPTICAL/IR IDENTIFICATIONS ' Astrophysical Journal , vol. 817 , no. 1 , 34 . DOI: 10.3847/0004-637X/817/1/34

Title: THE CHANDRA COSMOS LEGACY SURVEY : OPTICAL/IR IDENTIFICATIONS
Author: Marchesi, S.; Civano, F.; Elvis, M.; Salvato, M.; Brusa, M.; Comastri, A.; Gilli, R.; Hasinger, G.; Lanzuisi, G.; Miyaji, T.; Treister, E.; Urry, C. M.; Vignali, C.; Zamorani, G.; Allevato, V.; Cappelluti, N.; Cardamone, C.; Finoguenov, A.; Griffiths, R. E.; Karim, A.; Laigle, C.; LaMassa, S. M.; Jahnke, K.; Ranalli, P.; Schawinski, K.; Schinnerer, E.; Silverman, J. D.; Smolcic, V.; Suh, H.; Trakhtenbrot, B.
Contributor: University of Helsinki, Division of Geophysics and Astronomy
University of Helsinki, Department of Physics
Date: 2016-01-20
Language: eng
Number of pages: 23
Belongs to series: Astrophysical Journal
ISSN: 0004-637X
URI: http://hdl.handle.net/10138/183634
Abstract: We present the catalog of optical and infrared counterparts of the Chandra. COSMOS-Legacy. Survey, a 4.6 Ms Chandra. program on the 2.2 deg(2) of the COSMOS field, combination of 56 new overlapping observations obtained in Cycle 14 with the previous C-COSMOS survey. In this Paper we report the i, K, and 3.6 mu m identifications of the 2273 X-ray point sources detected in the new Cycle 14 observations. We use the likelihood ratio technique to derive the association of optical/infrared (IR) counterparts for 97% of the X-ray sources. We also update the information for the 1743 sources detected in C-COSMOS, using new K and 3.6 mu 3m information not available when the C-COSMOS analysis was performed. The final catalog contains 4016 X-ray sources, 97% of which have an optical/IR counterpart and a photometric redshift, while; similar or equal to 54% of the sources have a spectroscopic redshift. The full catalog, including spectroscopic and photometric redshifts and optical and X-ray properties described here in detail, is available online. We study several X-ray to optical (X/O) properties: with our large statistics we put better constraints on the X/O flux ratio locus, finding a shift toward faint optical magnitudes in both soft and hard X-ray band. We confirm the existence of a correlation between X/O and the the 2-10 keV luminosity for Type 2 sources. We extend to low luminosities the analysis of the correlation between the fraction of obscured AGNs and the hard band luminosity, finding a different behavior between the optically and X-ray classified obscured fraction.
Subject: catalogs
cosmology: observations
galaxies: active
galaxies: evolution
surveys
X-rays: general
ACTIVE GALACTIC NUCLEI
X-RAY SOURCES
SUPERMASSIVE BLACK-HOLES
WIDE-FIELD SURVEY
SPECTRAL ENERGY-DISTRIBUTIONS
STAR-FORMING GALAXIES
MEDIUM-SENSITIVITY SURVEY
EVOLUTION SURVEY COSMOS
COMPTON-THICK AGN
ROSAT DEEP SURVEY
115 Astronomy, Space science
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