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A very bright (i=16.44) quasar in the 'redshift desert' discovered by the Guoshoujing Telescope (LAMOST)
Wu, Xue-Bing1; Chen, Zhao-Yu1; Jia, Zhen-Dong1; Zuo, Wen-Wen1; Zhao, Yong-Heng2; Luo, A-Li2; Bai, Zhong-Rui2; Chen, Jian-Jun2; Zhang, Hao-Tong2; Yan, Hong-Liang2; Ren, Juan-Juan2; Sun, Shi-Wei2; Wu, Hong2; Zhang, Yong3; Li, Ye-Ping3; Lu, Qi-Shuai3; Wang, You3; Ni, Ji-Jun3; Wang, Hai3; Kong, Xu4; Shen, Shi-Yin5
2010-08-01
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
卷号10期号:8页码:737-744
摘要The redshift range from 2.2 to 3 is known as the 'redshift desert' of quasars because quasars with redshifts in this range have similar optical colors as normal stars and are thus difficult to find in optical sky surveys. A quasar candidate, SDSS J085543.40-001517.7, which was selected by a recently proposed criterion involving near-IR Y - K and optical g - z colors, was identified spectroscopically as a new quasar with a redshift of 2.427 by the Guoshoujing Telescope (LAMOST) commissioning observation in 2009 December and confirmed by the observation made with the NAOC/Xinglong 2.16m telescope in 2010 March. This quasar was not identified in the SDSS spectroscopic survey. Comparing with other SDSS quasars, we found that this new quasar, with an i magnitude of 16.44, is apparently the brightest one in the redshift range from 2.3 to 2.7. From its spectral properties, we derived its central black hole mass to be (1.4 similar to 3.9) x 10(10) M(circle dot) and its bolometric luminosity to be 3.7 x 10(48) erg s(-1), which indicates that this new quasar is intrinsically very bright and belongs to the class of the most luminous quasars in the universe. Our identification supports the notion that quasars in the redshift desert can be found by the quasar selection criterion involving the near-IR colors. More missing quasars are expected to be uncovered by future LAMOST spectroscopic surveys, which is important to the study of the cosmological evolution of quasars at redshifts higher than 2.2.
关键词Quasars: General Quasars: Emission Lines Galaxies: Active
收录类别SCI
语种英语
WOS记录号WOS:000281136200003
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被引频次:15[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7788
专题光学天文研究部
作者单位1.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Chinese Acad Sci, Natl Inst Astron Opt & Technol, Nanjing 210042, Peoples R China
4.Univ Sci & Technol China, Ctr Astrophys, Hefei 230026, Peoples R China
5.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
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Wu, Xue-Bing,Chen, Zhao-Yu,Jia, Zhen-Dong,et al. A very bright (i=16.44) quasar in the 'redshift desert' discovered by the Guoshoujing Telescope (LAMOST)[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2010,10(8):737-744.
APA Wu, Xue-Bing.,Chen, Zhao-Yu.,Jia, Zhen-Dong.,Zuo, Wen-Wen.,Zhao, Yong-Heng.,...&Shen, Shi-Yin.(2010).A very bright (i=16.44) quasar in the 'redshift desert' discovered by the Guoshoujing Telescope (LAMOST).RESEARCH IN ASTRONOMY AND ASTROPHYSICS,10(8),737-744.
MLA Wu, Xue-Bing,et al."A very bright (i=16.44) quasar in the 'redshift desert' discovered by the Guoshoujing Telescope (LAMOST)".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 10.8(2010):737-744.
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