A collaboration led by incoming Steward postdoc Jinyi Yang (Peking University, China and Steward Observatory, University of Arizona), and including Regents' Professor Xiaohui Fan, and Feige Wang, Ian McGreer, Richard Green, Minghao Yue, and Jiani Ding have found a significant number of new quasars in a redshift range, 5.3<z<5.7, that is difficult to probe with optical data alone.
They used optical SDSS photometry combined with infrared photometry from several sources: UKIRT InfraRed Deep Sky Surveys - Large Area Survey (ULAS), VISTA Hemisphere Survey (VHS), and the WISE satellite (Wide Field Infrared Survey Explorer). Candidates were followed up spectroscopically using Arizona's MMT and Bok telescopes, as well as the ANU 2.3m telescope and the Lijiang 2.4m telescope. Fifteen new Quasars were confirmed in the 5.3<z<5.7 redshift range.
A AAS Nova article research highlight article can be found HERE.
The Journal article can be found HERE.
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