Photometric redshift and classification for the XMM-COSMOS sources

Abstract

We present photometric redshifts and spectral energy distribution (SED) classifications for a sample of 1542 optically identified sources detected with XMM in the COSMOS field. Our template fitting classifies 46 sources as stars and 464 as non-active galaxies, while the remaining 1032 require templates with an AGN contribution. High accuracy in the derived photometric redshifts was accomplished as the result of 1) photometry in up to 30 bands with high significance detections, 2) a new set of SED templates including 18 hybrids covering the far-UV to mid-infrared, which have been constructed by the combination of AGN and non-active galaxies templates, and 3) multi-epoch observations that have been used to correct for variability (most important for type 1 AGN). The reliability of the photometric redshifts is evaluated using the sub-sample of 442 sources with measured spectroscopic redshifts. We achieved an accuracy of ${\sigma }_{\Delta z/(1+z_{spec})}=0.014$ for i${}_{AB}^{\ast }<$22.5 (${\sigma }_{\Delta z/(1+z_{spec})}\sim 0.015$ for i${}_{AB}^{\ast }<$24.5). The high accuracies were accomplished for both type 2 (where the SED is often dominated by the host galaxy) and type 1 AGN and QSOs out to $z=4.5$. The number of outliers is a large improvement over previous photometric redshift estimates for X-ray selected sources (4.0% and 4.8% outliers for i${}_{AB}^{\ast }<$22.5 and i${}_{AB}^{\ast }<$24.5, respectively). We show that the intermediate band photometry is vital to achieving accurate photometric redshifts for AGN, whereas the broad SED coverage provided by mid infrared (Spitzer/IRAC) bands is important to reduce the number of outliers for normal galaxies.

Accepted for publication in ApJ

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• The SRG/eROSITA all-sky survey: Hard X-ray selected Active Galactic Nuclei
• Chandra Survey in the AKARI North Ecliptic Pole Deep Field Optical/Infrared Identifications of X-ray Sources
• H1821+643: The most X-ray and infrared luminous AGN in the Swift/BAT survey in the process of rapid stellar and supermassive black hole mass assembly
• Astroinformatics Challenges from Next-generation Radio Continuum Surveys
• Hot-Dust (690K) Luminosity Density and its Evolution in the last 7.5Gyr
• Exploring the physical properties of Type II Quasar candidates at intermediate redshifts with CIGALE
• Nearby dwarf galaxies with extreme star formation rates: a window into dwarf-galaxy evolution in the early Universe
• SRG/eROSITA Survey in the Lockman Hole: Classification of X-ray Sources
• A unique distant submillimeter galaxy with an X-ray-obscured radio-luminous active galactic nucleus
• Galaxy Optical Variability of Virgo Cluster: New Tracer for Environmental Influences on Galaxies
• SuperCLASS -- II: Photometric Redshifts and Characteristics of Spatially-Resolved $\mu$Jy Radio Sources
• The miniJPAS survey quasar selection IV: Classification and redshift estimation with SQUEzE
• Constraining the AGN tori at cosmic noon using high-resolution JWST imaging and simultaneous SED fitting
• AGN evolution from large and deep X-ray surveys
• 4MOST ChANGES: Catalog of high-redshift quasar candidates (4.5 < $z$ < 7) selected with SED fitting
• The ROSAT Raster Survey in the North-Ecliptic Pole Field: X-ray Catalogue and Optical Identifications
• TOPz: Photometric redshifts using template fitting applied to the GAMA survey