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  SDSS-IV eBOSS spectroscopy of X-Ray and WISE AGNs in Stripe 82X: Overview of the demographics of X-Ray- and mid-infrared-selected active galactic nuclei

LaMassa, S. M., Georgakakis, A., Vivek, M., Salvato, M., Ananna, T. T., Urry, C. M., et al. (2019). SDSS-IV eBOSS spectroscopy of X-Ray and WISE AGNs in Stripe 82X: Overview of the demographics of X-Ray- and mid-infrared-selected active galactic nuclei. The Astrophysical Journal, 876(1): 50. doi:10.3847/1538-4357/ab108b.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-B71B-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-B71C-0
Genre: Journal Article

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LaMassa, Stephanie M., Author
Georgakakis, Antonis, Author
Vivek, M., Author
Salvato, Mara1, Author              
Ananna, Tonima Tasnim, Author
Urry, C. Meg, Author
MacLeod, Chelsea, Author
Ross, Nicholas, Author
Affiliations:
1High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: We report the results of a Sloan Digital Sky Survey IV eBOSS program to target X-ray sources and mid-infrared-selected Wide-field Infrared Survey Explorer (WISE) active galactic nucleus (AGN) candidates in a 36.8 deg2 region of Stripe 82. About half this survey (15.6 deg2) covers the largest contiguous portion of the Stripe 82 X-ray survey. This program represents the largest spectroscopic survey of AGN candidates selected solely by their WISE colors. We combine this sample with X-ray and WISE AGNs in the field identified via other sources of spectroscopy, producing a catalog of 4847 sources that is 82% complete to r ~ 22. Based on X-ray luminosities or WISE colors, 4730 of these sources are AGNs, with a median sample redshift of z ~ 1. About 30% of the AGNs are optically obscured (i.e., lack broad lines in their optical spectra). BPT analysis, however, indicates that 50% of the WISE AGNs at z < 0.5 have emission line ratios consistent with star-forming galaxies, so whether they are buried AGNs or star-forming galaxy contaminants is currently unclear. We find that 61% of X-ray AGNs are not selected as mid-infrared AGNs, with 22% of X-ray AGNs undetected by WISE. Most of these latter AGNs have high X-ray luminosities (L x > 1044 erg s−1), indicating that mid-infrared selection misses a sizable fraction of the highest luminosity AGNs, as well as lower luminosity sources where AGN-heated dust is not dominating the mid-infrared emission. Conversely, ~58% of WISE AGNs are undetected by X-rays, though we do not find that they are preferentially redder than the X-ray-detected WISE AGNs.

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 Dates: 2019-05-01
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab108b
Other: LOCALID: 3065492
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol, England : IOP Publishing LTD
Pages: - Volume / Issue: 876 (1) Sequence Number: 50 Start / End Page: - Identifier: ISSN: 1538-4357
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3