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; C. Megan Urry; Nico Cappelluti; Carolin Cardamone; Francesca Civano; Duncan Farrah; Marat Gilfanov; Eilat Glikman; Mark Hamilton; Allison Kirkpatrick; Giorgio Lanzuisi; Stefano Marchesi; Andrea Merloni; Kirpal Nandra; Priyamvada Natarajan; Gordon T. Richards; John Timlin

doi:10.3847/1538-4357/aa937d

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, C. Megan Urry, Nico Cappelluti, Carolin Cardamone, Francesca Civano, Duncan Farrah, Marat Gilfanov, Eilat Glikman, Mark Hamilton, Allison Kirkpatrick, Giorgio Lanzuisi, Stefano Marchesi, Andrea Merloni, Kirpal Nandra, Priyamvada Natarajan, Gordon T. Richards, John Timlin

Research output: Contribution to journal › Article › peer-review

21 Scopus citations

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, σ_nmad = 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).

Original language	English (US)
Article number	66
Journal	Astrophysical Journal
Volume	850
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aa937d
State	Published - Nov 20 2017
Externally published	Yes

Keywords

Catalogs
Quasars: absorption lines
Quasars: emission lines
Quasars: general
Techniques: photometric
Techniques: spectroscopic

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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Ananna, T. T., Salvato, M., Lamassa, S., Urry, C. M., Cappelluti, N., Cardamone, C., Civano, F., Farrah, D., Gilfanov, M., Glikman, E., Hamilton, M., Kirkpatrick, A., Lanzuisi, G., Marchesi, S., Merloni, A., Nandra, K., Natarajan, P., Richards, G. T., & Timlin, J. (2017). AGN populations in large-volume X-ray surveys: Photometric redshifts and population types found in the stripe 82X survey. Astrophysical Journal, 850(1), [66]. https://doi.org/10.3847/1538-4357/aa937d

AGN populations in large-volume X-ray surveys : Photometric redshifts and population types found in the stripe 82X survey. / 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; Lanzuisi, Giorgio; Marchesi, Stefano; Merloni, Andrea; Nandra, Kirpal; Natarajan, Priyamvada; Richards, Gordon T.; Timlin, John.

In: Astrophysical Journal, Vol. 850, No. 1, 66, 20.11.2017.

Research output: Contribution to journal › Article › peer-review

Ananna, TT, Salvato, M, Lamassa, S, Urry, CM, Cappelluti, N, Cardamone, C, Civano, F, Farrah, D, Gilfanov, M, Glikman, E, Hamilton, M, Kirkpatrick, A, Lanzuisi, G, Marchesi, S, Merloni, A, Nandra, K, Natarajan, P, Richards, GT & Timlin, J 2017, 'AGN populations in large-volume X-ray surveys: Photometric redshifts and population types found in the stripe 82X survey', Astrophysical Journal, vol. 850, no. 1, 66. https://doi.org/10.3847/1538-4357/aa937d

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 ; Lanzuisi, Giorgio ; Marchesi, Stefano ; Merloni, Andrea ; Nandra, Kirpal ; Natarajan, Priyamvada ; Richards, Gordon T. ; Timlin, John. / AGN populations in large-volume X-ray surveys : Photometric redshifts and population types found in the stripe 82X survey. In: Astrophysical Journal. 2017 ; Vol. 850, No. 1.

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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).",

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AU - Ananna, Tonima Tasnim

AU - Salvato, Mara

AU - Lamassa, Stephanie

AU - Urry, C. Megan

AU - Cappelluti, Nico

AU - Cardamone, Carolin

AU - Civano, Francesca

AU - Farrah, Duncan

AU - Gilfanov, Marat

AU - Glikman, Eilat

AU - Hamilton, Mark

AU - Kirkpatrick, Allison

AU - Lanzuisi, Giorgio

AU - Marchesi, Stefano

AU - Merloni, Andrea

AU - Nandra, Kirpal

AU - Natarajan, Priyamvada

AU - Richards, Gordon T.

AU - Timlin, John

N1 - Funding Information: TA wishes to thank her parents, M. A. Quayum and Shamim Ara Begum, and her husband, Mehrab Bakhtiar, for their constant support under all conditions. She is very grateful to Ms. Birgit Boller of Max Planck, Garching, for supporting her visit there. The authors thank Ms. Geriana Van Atta of Yale University. This project was supported by Yale University, and the XMM-Newton analysis was partially supported by NASA grant NNX15AJ40G. Publisher Copyright: © 2017. The American Astronomical Society. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.

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KW - Quasars: emission lines

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