Capability of quasar selection by combining SCUSS and SDSS observations

Hu Zou, Xue Bing Wu, Xu Zhou, Shu Wang, Linhua Jiang, Xiaohui Fan, Zhou Fan, Zhaoji Jiang, Yipeng Jing, Michael Lesser, Cheng Li, Jun Ma, Jundan Nie, Shiyin Shen, Jiali Wang, Zhenyu Wu, Tianmeng Zhang, Zhimin Zhou

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


The South Galactic Cap u-band Sky Survey (SCUSS) provides a deep u-band imaging of about 5000 deg2 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.

Original languageEnglish (US)
Pages (from-to)94-101
Number of pages8
JournalPublications of the Astronomical Society of the Pacific
Issue number948
StatePublished - 2015

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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