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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 731932.0, MPI für Astronomie / Publikationen_mpia
The Chandra COSMOS Legacy survey: optical/IR identifications
Authors: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.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:The Astrophysical Journal
Volume:817
Start Page:id. 34 (23 pp)
Audience:Not Specified
Abstract / Description: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 deg2 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 μm 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 μm 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 ≃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.
Free Keywords:catalogs; cosmology: observations; galaxies: active; galaxies: evolution; surveys; X-rays: general
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X
URL:http://cdsads.u-strasbg.fr/abs/2016ApJ...817...34M
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