| Title | Capability of Quasar Selection by Combining SCUSS and SDSS Observations |
| Authors | Zou, Hu Wu, Xue-Bing Zhou, Xu Wang, Shu Jiang, Linhua Fan, Xiaohui Fan, Zhou Jiang, Zhaoji Jing, Yipeng Lesser, Michael Li, Cheng Ma, Jun Nie, Jundan Shen, Shiyin Wang, Jiali Wu, Zhenyu Zhang, Tianmeng Zhou, Zhimin |
| Affiliation | Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China. Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China. Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China. Univ Arizona, Steward Observ, Tucson, AZ 85721 USA. Shanghai Jiao Tong Univ, Dept Phys & Astron, Ctr Astron & Astrophys, Shanghai 200240, Peoples R China. Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China. |
| Keywords | DIGITAL SKY SURVEY Z-SIMILAR-TO-6 QUASARS OPTICAL VARIABILITY TARGET SELECTION BLACK-HOLES STRIPE 82 REIONIZATION EVOLUTION COLORS UKIDSS |
| Issue Date | 2015 |
| Publisher | publications of the astronomical society of the pacific |
| Citation | PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC.2015,127,(948),94-101. |
| Abstract | The South Galactic Cap u-band Sky Survey (SCUSS) provides a deep u-band imaging of about 5000 deg(2) in south Galactic cap. It is about 1.5 mag deeper than the SDSS u-band. In this article, we evaluate the capability of quasar selection using both SCUSS and SDSS data, based on considerations of the deep SCUSS u-band imaging and two-epoch u-band variability. We find that the combination of the SCUSS u-band and the SDSS griz-band allows us to select more faint quasars and more quasars at redshift around 2.2 than the selection that uses only the SDSS ugriz data. Quasars have significant u-band variabilities. The fraction of quasars with large two-epoch variability is much higher than that of stars. The selection by variability can select both low-redshift quasars with ultraviolet excess and mid-redshift (2 < z < 3.5) quasars where quasar selection by optical colors is inefficient. The above two selections are complementary and make full use of the SCUSS u-band advantages. |
| URI | http://hdl.handle.net/20.500.11897/386157 |
| ISSN | 0004-6280 |
| DOI | 10.1086/680212 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 科维理天文与天体物理研究所 |
