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The Chandra COSMOS Legacy survey: optical/IR identifications | | S. Marchesi
; F. Civano
; M. Elvis
; M. Salvato
; M. Brusa
; A. Comastri
; R. Gilli
; G. Hasinger
; G. Lanzuisi
; T. Miyaji
; E. Treister
; C.M. Urry
; C. Vignali
; G. Zamorani
; V. Allevato
; N. Cappelluti
; C. Cardamone
; A. Finoguenov
; R. E. Griffiths
; A. Karim
; C. Laigle
; S. M. LaMassa
; K. Jahnke
; P. Ranalli
; K. Schawinski
; E. Schinnerer
; J. D. Silverman
; V. Smolcic
; H. Suh
; B. Trakhtenbrot
; | | Date: |
3 Dec 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 square degrees 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
micron 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 micron 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 towards 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 AGN and the hard
band luminosity, finding a different behavior between the optically and X-ray
classified obscured fraction. | | Source: | arXiv, 1512.1105 | | Services: | Forum | Review | PDF | Favorites | |
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