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Journal article
AGN Populations in Large-volume X-Ray Surveys: Photometric Redshifts and Population Types Found in the Stripe 82X Survey
The Astrophysical journal, v 850(1)
20 Nov 2017
Abstract
Multiwavelength 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, sigma(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 3XMM (in X-ray) and the Large Synoptic Survey Telescope (optical).
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Details
- Title
- AGN Populations in Large-volume X-Ray Surveys: Photometric Redshifts and Population Types Found in the Stripe 82X Survey
- Creators
- Tonima Tasnim Ananna - Yale UniversityMara Salvato - High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck SocietyStephanie LaMassa - Space Telescope Science InstituteC. Megan Urry - Yale UniversityNico Cappelluti - Yale UniversityCarolin Cardamone - Wheelock CollegeFrancesca Civano - Center for Astrophysics Harvard & SmithsonianDuncan Farrah - Virginia TechMarat Gilfanov - Max Planck Institute for AstrophysicsEilat Glikman - Middlebury CollegeMark Hamilton - Yale UniversityAllison Kirkpatrick - Yale UniversityGiorgio Lanzuisi - Univ Bologna, Dipartimento Fis & Astron, Via Gobetti 93-2, I-40129 Bologna, ItalyStefano Marchesi - Clemson UniversityAndrea Merloni - Max Planck Institute for Extraterrestrial PhysicsKirpal Nandra - High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck SocietyPriyamvada Natarajan - Yale UniversityGordon T. Richards - Drexel UniversityJohn Timlin - Drexel University
- Publication Details
- The Astrophysical journal, v 850(1)
- Publisher
- Iop Publishing Ltd
- Number of pages
- 26
- Grant note
- Yale University NNX15AJ40G / NASA; National Aeronautics & Space Administration (NASA)
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000415832400009
- Scopus ID
- 2-s2.0-85035010189
- Other Identifier
- 991019168497904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics