The Chandra COSMOS Legacy survey: optical/IR identifications

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.

28 pages, 14 figures, accepted to ApJ

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• Counterpart identification and classification for eRASS1 and characterisation of the AGN content
• The XMM-Newton Wide Field Survey in the COSMOS Field: Clustering Dependence of X-ray Selected AGN on Host Galaxy Properties
• A super-linear "radio-AGN main sequence'' links mean radio-AGN power and galaxy stellar mass since z$\sim$3
• Dust Temperature of Compact Star-forming Galaxies at $z\sim 1-3$ in 3D-{\it HST}/CANDELS
• pop-cosmos: Scaleable inference of galaxy properties and redshifts with a data-driven population model
• Where Do Obscured AGN Fit in A Galaxy's Timeline?
• Obscured AGN enhancement in galaxy pairs at cosmic noon: evidence from a probabilistic treatment of photometric redshifts
• Surveys of the Cosmic X-ray Background
• Viewing angle observations and effects of evolution with redshift, black hole mass, and Eddington ratio in quasar based cosmology
• The ALPINE-ALMA [C II] survey: the luminosity function of serendipitous [C II] line emitters at $z\sim 5$
• Joint Survey Processing I: Compact oddballs in the COSMOS field -- low-luminosity Quasars at z > 6?
• GALFIT-ing AGN Host Galaxies in COSMOS: HST vs. Subaru
• The nature of H$\alpha$-selected galaxies along the large-scale structure at z=0.4 revealed by Subaru Hyper Suprime-Cam survey
• A first eROSITA view of ultracool dwarfs
• Selection of optically variable active galactic nuclei via a random forest algorithm
• COSMOS Brightest Group Galaxies -- III: Evolution of stellar ages
• The XXL Survey: XLIII. The quasar radio loudness dichotomy exposed via radio luminosity functions obtained by combining results from COSMOS and XXL-S X-ray selected quasars
• The role of SPICA-like missions and the Origins Space Telescope in the quest for heavily obscured AGN and synergies with Athena
• Resolving galactic-scale obscuration of X-ray AGN at $z\gtrsim 1$ with COSMOS-Web
• The NuSTAR Extragalactic Surveys: unveiling rare, buried AGNs and detecting the contributors to the peak of the Cosmic X-ray Background
• Multi-wavelength Selected Compton-thick AGNs in Chandra Deep Field-South Survey
• A Morphological Study on Galaxies Hosting Optical Variability-Selected AGNs in the COSMOS Field
• XMM-Newton view of X-ray overdensities from nearby galaxy clusters: the environmental dependencies
• An Eddington ratio-driven origin for the ${\mathrm{L}}_{\mathrm{X}}-{\mathrm{M}}_{\ast }$ relation in quiescent and star forming active galaxies
• PRIMER: JWST/MIRI reveals the evolution of star-forming structures in galaxies at z<2.5
• MAMBO -- An empirical galaxy and AGN mock catalogue for the exploitation of future surveys
• The many flavours of photometric redshifts
• Cosmic happenstance: 24-$\mu$m selected, multi-component Herschel sources are line-of-sight projections
• Spectroscopy of an extreme [OIII] emitting active galactic nucleus at $z=3.212$: implications for the reionisation era
• Properties of IR selected Active Galactic Nuclei
• X-ray Selected Narrow-Line Active Galactic Nuclei in the COSMOS Field: Nature of Optically Dull Active Galactic Nuclei
• Inferring Compton-thick AGN candidates at z>2 with Chandra using the >8 keV restframe spectral curvature
• A comprehensive study of H$\alpha$ emitters at $z\sim$ 0.62 in the DAWN survey: the need for deep and wide regions
• Large-scale clustering of buried X-ray AGN: Trends in AGN obscuration and redshift evolution
• The relationship of SMBHs and host galaxies at $z<4$ in the deep optical variability-selected AGN sample in the COSMOS field
• Photometric Selection of type 1 Quasars in the XMM-LSS Field with Machine Learning and the Disk-Corona Connection
• The [OIII] profiles of far-infrared active and non-active optically-selected green valley galaxies
• Triggering nuclear and galaxy activity in the Bullet cluster
• The Radio Spectral Energy Distribution and Star Formation Calibration in MIGHTEE-COSMOS Highly Star-Forming Galaxies at 1.5 < z < 3.5
• X-Ray Redshifts of Obscured Chandra Source Catalog AGN
• "Zombie" or active? An alternative explanation to the properties of star-forming galaxies at high redshift
• LBT-MODS spectroscopy of high-redshift candidates in the Chandra J1030 field. A newly discovered z$\sim$2.8 large scale structure
• Chandra Survey in the AKARI North Ecliptic Pole Deep Field Optical/Infrared Identifications of X-ray Sources
• The ALPINE-ALMA [CII] survey: The infrared-radio correlation and AGN fraction of star-forming galaxies at z $\sim$ 4.4-5.9
• Reconstructing AGN X-ray spectral parameter distributions with Bayesian methods II: Population inference
• Analogs of primeval galaxies two billion years after the Big Bang
• A PAH deficit in the starburst core of a distant spiral galaxy
• The viewing angle in AGN SED models, a data-driven analysis
• X-ray selection of Compton Thick AGN at high redshift
• Host galaxy and nuclear properties of IR-selected AGNs with and without outflow signatures
• Exploring the X-ray-radio connection for AGN via measurements of the multi-dimensional luminosity function
• Tracing obscured galaxy build-up at high redshift using deep radio surveys
• BASS XLV: Quantifying AGN Selection Effects in the Chandra COSMOS-Legacy Survey with BASS
• SRG/eROSITA Survey in the Lockman Hole: Classification of X-ray Sources
• Harnessing the XMM-Newton data: X-ray spectral modelling of 4XMM-DR11 detections and 4XMM-DR11s sources
• Navigating AGN variability with self-organizing maps
• The COSMOS Wall at z$\sim$0.73: star-forming galaxies and their evolution in different environments
• The major merger-active galactic nucleus connection up to the cosmic noon
• Identifying Compton-thick active galactic nuclei in the COSMOS. II. Searching among mid-infrared selected AGNs
• JWST Spectroscopic View of a Rapidly Growing Dust-obscured Quasar at $z\sim 4$: Effect of Dust Extinction Correction on Black Hole Mass and Eddington Ratio Estimation
• X-Ray bright optically faint active galactic nuclei in the Subaru Hyper Suprime-Cam wide survey
• Obscured and unobscured X-ray AGNs I: Host galaxy properties
• Identifying AGN host galaxies by Machine Learning with HSC+WISE
• X-ray sources in the 1.75 Ms Ultra Narrow Deep Field observed by XMM-Newton
• The ROSAT Raster Survey in the North-Ecliptic Pole Field: X-ray Catalogue and Optical Identifications
• COSMOS-Web: Galaxy Size and Surface Brightness Evolution at Rest-Frame 1.22 $\mu$m Since $z=3$
• Low star-formation activity and low gas content of quiescent galaxies at $z=$ 3.5-4.0 constrained with ALMA
• Seeing through the dust: Unraveling near-infrared variability in type 2 active galactic nuclei
• A multiwavelength study of an early galaxy group merger in COSMOS revealed by two tailed radio galaxies at z = 0.35
• Joint Survey Processing II: Stellar Proper Motions in the COSMOS Field, from Hubble Space Telescope ACS and Subaru Telescope HSC Observations
• The Compact Star-Forming Galaxies at $2<z<3$ in 3D-HST/CANDELS: AGN and Non-AGN Physical Properties