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

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 stru...

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Bibliographic Details
Published in:	Science China. Physics, mechanics & astronomy mechanics & astronomy, 2015-09, Vol.58 (9), p.90-94, Article 599501
Main Authors:	Yi, WeiMin, Wu, XueBing, Wang, FeiGe, Yang, JinYi, Yang, Qian, Bai, JinMing
Format:	Article
Language:	eng
Subjects:	Absorption Accretion Accretion disks Active galactic nuclei Astronomy Classical and Continuum Physics Evolution Feedback Neutrons Observations and Techniques Outflow Physical properties Physics Physics and Astronomy Quasars Red shift Supermassive black holes Telescopes 丽江光谱鉴定吸收线望远镜活动星系核物理变化类星体高红移
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Summary:	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.
ISSN:	1674-7348 1869-1927