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18 April 2024

» arxiv » 1710.1296

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AGN Populations in Large Volume X-ray Surveys: Photometric Redshifts and Population Types found in the Stripe 82X Survey
Tonima Tasnim Ananna ; Mara Salvato ; Stephanie LaMassa ; Claudia Megan Urry ; Nico Cappelluti ; Carolin Cardamone ; Francesca Civano ; Duncan Farrah ; Marat Gilfanov ; Eilat Glikman ; Mark Hamilton ; Allison Kirkpatrick ; G. Lanzuisi ; Stefano Marchesi ; Andrea Merloni ; Kirpal Nandra ; Priyamvada Natarajan ; Gordon Richards ; John Timlin ;
Date:	3 Oct 2017
Abstract:	Multi-wavelength surveys covering large sky volumes are necessary to obtain an accurate census of rare objects such as high luminosity and/or high redshift active galactic nuclei (AGN). Stripe 82X is a 31.3 deg$^2$ X-ray survey with $Chandra$ and $XMM$-Newton observations overlapping the legacy Sloan Digital Sky Survey (SDSS) Stripe 82 field, which has a rich investment of multi-wavelength coverage from the ultraviolet to the radio. The wide-area nature of this survey presents new challenges for photometric redshifts for AGN compared to previous work on narrow-deep fields because it probes different populations of objects that need to be identified and represented in the library of templates. Here we present an updated X-ray plus multi-wavelength matched catalog, including $Spitzer$ counterparts, and estimated photometric redshifts for 5961 (96% of a total of 6181) X-ray sources, which have a normalized median absolute deviation, $sigma_{ m nmad}$ = 0.06 and an outlier fraction, $eta$ = 13.7%. The populations found in this survey, and the template libraries used for photometric redshifts, provide important guiding principles for upcoming large-area surveys such as $eROSITA$ and 3$XMM$ (in X-ray) and the Large Synoptic Survey Telescope (LSST; optical).
Source:	arXiv, 1710.1296
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