Discovery of two broad absorption line quasars at redshift about 4.75 using the Lijiang 2.4 m telescope  

作　　者：YI WeiMin WU XueBing WANG FeiGe YANG JinYi YANG Qian BAI JinMing 

机构地区：[1]Yunnan Observatories, Chinese Academy of Sciences [2]University of the Chinese Academy of Sciences [3]Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences [4]Department of Astronomy, School of Physics, Peking University [5]Kavli Institute for Astronomy and Astrophysics, Peking University

出　　处：《Science China(Physics,Mechanics & Astronomy)》2015年第9期90-94,共5页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Strategic Priority Research Program"The emergence of Cosmological Structures"of the Chinese Academy of Sciences(Grant No.XDB09000000);the National Natural Science Foundation of China(Grant Nos.11373008,11133006 and 11361140347)

摘　　要：The ultraviolet broad absorption lines have been seen in the spectra of quasars at high redshift, and are generally considered to be caused by outflows with velocities from thousands kilometers per second to one tenth of the speed of light. They provide crucial implications for the cosmological structures and physical evolutions related to the feedback of active galactic nuclei(AGNs).Recently, through a dedicated program of optically spectroscopic identifications of selected quasar candidates at redshift 5 by using the Lijiang 2.4 m telescope, we discovered two luminous broad absorption line quasars(BALQSOs) at redshift about 4.75. One of them may even have the potentially highest absorption Balnicity Index(BI) ever found to date, which is remarkably characterized by its deep, broad absorption lines and sub-relativistic outflows. Further physical properties, including the metal abundances,variabilities, evolutions of the supermassive black holes(SMBH) and accretion disks associated with the feedback process, can be investigated with multi-wavelength follow-up observations in the future.The ultraviolet broad absorption lines have been seen in the spectra of quasars at high redshift, and are generally considered to be caused by outflows with velocities from thousands kilometers per second to one tenth of the speed of light. They provide crucial implications for the cosmological structures and physical evolutions related to the feedback of active galactic nuclei（AGNs）.Recently, through a dedicated program of optically spectroscopic identifications of selected quasar candidates at redshift 5 by using the Lijiang 2.4 m telescope, we discovered two luminous broad absorption line quasars（BALQSOs） at redshift about 4.75. One of them may even have the potentially highest absorption Balnicity Index（BI） ever found to date, which is remarkably characterized by its deep, broad absorption lines and sub-relativistic outflows. Further physical properties, including the metal abundances,variabilities, evolutions of the supermassive black holes（SMBH） and accretion disks associated with the feedback process, can be investigated with multi-wavelength follow-up observations in the future.

关 键 词：HIGH-REDSHIFT active galactic nuclear（AGN） broad absorption line quasar（BALQSO） OUTFLOW 

分 类 号：TH751[机械工程—仪器科学与技术]