Ananna, Tonima TasnimTonima TasnimAnannaSalvato, MaraMaraSalvatoLaMassa, StephanieStephanieLaMassaUrry, C. MeganC. MeganUrryCAPPELLUTI, NicoNicoCAPPELLUTICardamone, CarolinCarolinCardamoneCivano, FrancescaFrancescaCivanoFarrah, DuncanDuncanFarrahGilfanov, MaratMaratGilfanovGlikman, EilatEilatGlikmanHamilton, MarkMarkHamiltonKirkpatrick, AllisonAllisonKirkpatrickLANZUISI, GiorgioGiorgioLANZUISIMARCHESI, STEFANOSTEFANOMARCHESIMerloni, AndreaAndreaMerloniNandra, KirpalKirpalNandraNatarajan, PriyamvadaPriyamvadaNatarajanRichards, Gordon T.Gordon T.RichardsTimlin, JohnJohnTimlin2020-12-222020-12-2220170004-637Xhttp://hdl.handle.net/20.500.12386/29086Multiwavelength 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 (AGNs). Stripe 82X is a 31.3 X-ray survey with Chandra and XMM-Newton observations overlapping the legacy Sloan Digital Sky Survey Stripe 82 field, which has a rich investment of multiwavelength coverage from the ultraviolet to the radio. The wide-area nature of this survey presents new challenges for photometric redshifts for AGNs 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 multiwavelength matched catalog, including Spitzer counterparts, and estimated photometric redshifts for 5961 (96% of a total of 6181) X-ray sources that have a normalized median absolute deviation, σ<SUB>nmad</SUB>=0.06, and an outlier fraction, η = 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 3XMM (in X-ray) and the Large Synoptic Survey Telescope (optical).STAMPAenArticle10.3847/1538-4357/aa937d2-s2.0-85035010189000415832400009https://iopscience.iop.org/article/10.3847/1538-4357/aa937d2017ApJ...850...66AFIS/05 - ASTRONOMIA E ASTROFISICA