A very bright (i=16.44) quasar in the 'redshift desert' discovered by the Guoshoujing Telescope (LAMOST)

	A very bright (i=16.44) quasar in the 'redshift desert' discovered by the Guoshoujing Telescope (LAMOST)
	Wu, Xue-Bing 1; Chen, Zhao-Yu 1; Jia, Zhen-Dong 1; Zuo, Wen-Wen 1; Zhao, Yong-Heng 2; Luo, A-Li 2; Bai, Zhong-Rui 2; Chen, Jian-Jun 2; Zhang, Hao-Tong 2; Yan, Hong-Liang 2
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2010-08-01
卷号	10 期号:8 页码:737-744
关键词	quasars: general quasars: emission lines galaxies: active
英文摘要	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.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	DIGITAL-SKY-SURVEY ; 7TH DATA RELEASE ; LUMINOSITY FUNCTION ; CATALOG ; EMISSION ; SELECTION ; STRIPE ; SAMPLE
收录类别	SCI
语种	英语
WOS记录号	WOS:000281136200003
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/26354]
专题	上海天文台_星系宇宙学重点实验室
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
推荐引用方式 GB/T 7714	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.