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宽吸收线类星体物理研究

The physics of broad absorption line quasars

  • 摘要: 现在普遍相信类星体的反馈会调节寄主星系形成的进程,但其中具体的物理过程依然是个谜.类星体的外流是一个重要的候选者.为了确定外流的重要性,中国科学技术大学天体物理中心开展了宽吸收线类星体的一系列研究,取得了一些进展: (1)宽吸收线区的紫外吸收物质的柱密度比原来预计高出2个量级,低电离吸收线形成于饱和的高电离吸收线区;(2)射电宁静的宽吸收类星体吸收物质主要在赤道面,并且不同的源吸收物质分布情况很不相同,而在射电强的类星体中,赤道和极向外流都是可能的;(3)共振散射线偏振表明,外流物质携带角动量.

     

    Abstract: Quasar feedback is considered a crucial process in galaxy formation and evolution; however, details of the physical process remain a mystery. Quasar outflow is one possible process. To assess the importance of quasar outflow we have performed a series of studies on broad absorption line (BAL) quasars, and have obtained the following results. (1)The UV absorption column density is an order of magnitude higher than previously believed, and low ionization BALs are formed in the high ionization zone. (2) In radio-quiet BAL quasars, the outflow is mainly confined to the equatorial directionwhile in radio-loud ones both equatorial and polar outflows are possible. (3) The polarization of resonantly scattered lines suggests that the outflow carries large angular momentum.

     

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