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Discovering the missing 2.2 < z < 3 quasars by combining optical variability and optical/near-infrared colors

Wu, Xue-Bing; Wang, Ran; Schmidt, Kasper B; Bian, Fuyan; Jiang, Linhua; Fan, Xiaohui

Description

The identification of quasars in the redshift range 2.2 < z < 3 is known to be very inefficient because the optical colors of such quasars are indistinguishable from those of stars. Recent studies have proposed using optical variability or near-infrared (near-IR) colors to improve the identification of the missing quasars in this redshift range. Here we present a case study combining both methods. We select a sample of 70 quasar candidates from variables in Sloan Digital Sky Survey (SDSS)...[Show more]

CollectionsANU Research Publications
Date published: 2011
Type: Journal article
URI: http://hdl.handle.net/1885/71355
Source: Astronomical Journal
DOI: 10.1088/0004-6256/142/3/78

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