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THE MID-INFRARED LUMINOSITY EVOLUTION AND LUMINOSITY FUNCTION OF QUASARS WITH WISE AND SDSS

ABSTRACT We determine the 22 m luminosity evolution and luminosity function for quasars from a data set of over 20,000 objects obtained by combining flux-limited Sloan Digital Sky Survey optical and Wide field Infrared Survey Explorer mid-infrared data. We apply methods developed in previous works t...

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Bibliographic Details
Published in:The Astrophysical journal 2016-11, Vol.831 (1), p.60, Article 60
Main Authors: Singal, J., George, J., Gerber, A.
Format: Article
Language:English
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Summary:ABSTRACT We determine the 22 m luminosity evolution and luminosity function for quasars from a data set of over 20,000 objects obtained by combining flux-limited Sloan Digital Sky Survey optical and Wide field Infrared Survey Explorer mid-infrared data. We apply methods developed in previous works to access the intrinsic population distributions non-parametrically, taking into account the truncations and correlations inherent in the data. We find that the population of quasars exhibits positive luminosity evolution with redshift in the mid-infrared, but with considerably less mid-infrared evolution than in the optical or radio bands. With the luminosity evolutions accounted for, we determine the density evolution and local mid-infrared luminosity function. The latter displays a sharp flattening at local luminosities below ∼ 10 31 erg s−1 Hz−1, which has been reported previously at 15 m for AGN classified as both type 1 and type 2. We calculate the integrated total emission from quasars at 22 m and find it to be a small fraction of both the cosmic infrared background light and the integrated emission from all sources at this wavelength.
ISSN:0004-637X
1538-4357
DOI:10.3847/0004-637X/831/1/60