Capability of Quasar Selection by Combining SCUSS and SDSS Observations
Capability of Quasar Selection by Combining SCUSS and SDSS Observations
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DOI：
10.1086/680212
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发表时间：
2015-01
影响因子：
3.5
通讯作者：
H. Zou;Xue-Bing Wu;Xu Zhou;Shu I. Wang;Linhua Jiang;Xiaohui Fan;Z. Fan;Zhao-ji Jiang;Y. Jing;M. Lesser;Cheng Li;Jun Ma;J. Nie;S. Shen;Jiali Wang;Zhenyu Wu;Tianmeng Zhang;Zhi-min Zhou
中科院分区：
文献类型：
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作者：
H. Zou;Xue-Bing Wu;Xu Zhou;Shu I. Wang;Linhua Jiang;Xiaohui Fan;Z. Fan;Zhao-ji Jiang;Y. Jing;M. Lesser;Cheng Li;Jun Ma;J. Nie;S. Shen;Jiali Wang;Zhenyu Wu;Tianmeng Zhang;Zhi-min Zhou
南银帽u波段巡天（SCUSS）提供了南银帽约5000 deg2的深u波段图像。它比SDSS U波段深约1.5等。在这篇文章中，我们评估的能力，选择使用SCUSS和SDSS数据，深SCUSS的U波段成像和两个历元的U波段变化的考虑的基础上。我们发现，SCUSS的u波段和SDSS的griz波段的组合，使我们能够选择更多的微弱类星体和更多的类星体在红移约2.2比选择，只使用SDSS ugriz数据。类星体具有显著的u波段变化。类星体中具有大的两历元变率的比例远高于恒星。光变选择可以选择具有紫外线过剩的低红移类星体和中等红移（2 < z < 3.5）类星体，其中光学颜色选择类星体效率低下。上述两种选择是互补的，充分利用了SCUSS U波段的优势。
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.