AGN Populations in Large-volume X-Ray Surveys: Photometric Redshifts and Population Types Found in the Stripe 82X Survey
Journal
Date Issued
2017
Author(s)
Ananna, Tonima Tasnim
•
Salvato, Mara
•
LaMassa, Stephanie
•
Urry, C. Megan
•
CAPPELLUTI, Nico
•
Cardamone, Carolin
•
Civano, Francesca
•
Farrah, Duncan
•
Gilfanov, Marat
•
Glikman, Eilat
•
Hamilton, Mark
•
Kirkpatrick, Allison
•
•
•
Merloni, Andrea
•
Nandra, Kirpal
•
Natarajan, Priyamvada
•
Richards, Gordon T.
•
Timlin, John
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, σnmad=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).
Volume
850
Issue
1
Start page
66
Issn Identifier
0004-637X
Ads BibCode
2017ApJ...850...66A
Rights
open.access
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