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BAYESIAN HIGH-REDSHIFT QUASAR CLASSIFICATION FROM OPTICAL AND MID-IR PHOTOMETRY
Journal article   Open access

BAYESIAN HIGH-REDSHIFT QUASAR CLASSIFICATION FROM OPTICAL AND MID-IR PHOTOMETRY

Gordon T. Richards, Adam D. Myers, Christina M. Peters, Coleman M. Krawczyk, Greg Chase, Nicholas P. Ross, Xiaohui Fan, Linhua Jiang, Mark Lacy, Ian D. McGreer, …
The Astrophysical journal. Supplement series, v 219(2)
01 Aug 2015
url
https://europepmc.org/articles/pmc7167350View
Accepted (AM)Open Access (License Unspecified) Open
url
https://doi.org/10.1088/0067-0049/219/2/39View
Published, Version of Record (VoR) Open

Abstract

Astronomy & Astrophysics Physical Sciences Science & Technology
We identify 885,503 type 1 quasar candidates to i less than or similar to 22 using the combination of optical and mid-IR photometry. Optical photometry is taken from the Sloan Digital Sky Survey-III: Baryon Oscillation Spectroscopic Survey (SDSS-III/BOSS), while mid-IR photometry comes from a combination of data from the Wide-field Infrared Survey Explorer (WISE) "AllWISE" data release and several large-area Spitzer Space Telescope fields. Selection is based on a Bayesian kernel density algorithm with a training sample of 157,701 spectroscopically confirmed type. 1 quasars with both optical and mid-IR data. Of the quasar candidates, 733,713 lack spectroscopic confirmation (and 305,623 are objects that we have not previously classified as photometric quasar candidates). These candidates include 7874 objects targeted as high-probability potential quasars with 3.5 < z < 5 (of which 6779 are new photometric candidates). Our algorithm is more complete to z > 3.5 than the traditional mid-IR selection "wedges" and to 2.2 < z < 3.5 quasars than the SDSS-III/BOSS project. Number counts and luminosity function analysis suggest. that the resulting catalog is relatively complete to known quasars and is identifying new high-z quasars at z > 3. This catalog paves the way for luminosity-dependent clustering investigations of large numbers of faint, high-redshift quasars and for further machine-learning quasar selection using Spitzer and WISE data combined with other large-area optical imaging surveys.

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