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