UA Science

Photos courtesy of Frank S. Gacon

2017 Staff Recognition Awards

On April 12 we gathered outside to eat pie and ice cream, and to recognize Paul Hart and Michael Lefebvre for the Outstanding Staff Award and the Star Safety Award, respectively. The left photo shows Buell Jannuzi and Paul Hart. The right photo shows Buell Jannuzi, Christian Veillet, Jeff Kingsley, Michael Lefebvre, David Carroll, and Tom McMahon. Congratulations to Paul and Michael for making Steward a better and safer place to work. 

Image courtesy of AAS.

New Quasars with Redshifts 5.3<z<5.7

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....

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