Arxiv:1512.01105V1 [Astro-Ph.GA] 3 Dec 2015
Accepted to the Astrophysical Journal on November 30, 2015 A Preprint typeset using LTEX style emulateapj v. 5/2/11 THE CHANDRA COSMOS LEGACY SURVEY: OPTICAL/IR IDENTIFICATIONS S. Marchesi1,2,3, F. Civano1,2, M. Elvis2, M. Salvato4, M. Brusa3,5, A. Comastri5, R. Gilli5, G. Hasinger6, G. Lanzuisi3,5, T. Miyaji7,8, E. Treister9, C.M. Urry1, C. Vignali3,5, G. Zamorani5, V. Allevato10, N. Cappelluti5, C. Cardamone11, A. Finoguenov10, R. E. Griffiths12, A. Karim13, C. Laigle14, S. M. LaMassa1, K. Jahnke15, P. Ranalli16, K. Schawinski17, E. Schinnerer18,19, J. D. Silverman20, V. Smolcic21, H. Suh6,2, B. Trakhtenbrot17 Accepted to the Astrophysical Journal on November 30, 2015 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 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 op- tical/IR counterpart and a photometric redshift, while ≃54% of the sources have a spectroscopic redshift.
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