摘要
黑洞是广义相对论理论预言的天体,也是很多天文现象,如类星体、活动星系核、喷流、吸积盘的中心引擎。根据广义相对论,宇宙中的黑洞可以由质量和自旋两个参数来描述。对比黑洞质量的测定,自旋的测量较为困难。但自旋的方向与很多天文现象密切相关。如果黑洞自旋方向与吸积盘的转动方向一致,将形成正向吸积的天文现象;反之,如果黑洞自旋的与吸积盘的转动方向相反,将形成逆向吸积的天文现象。利用宽线区尺度与光学光度之间的关系,最近的研究发现了逆向吸积盘的可能候选体。利用双黑洞并合的物理图像提出了一种逆向吸积盘的物理形成机制,并定量计算了相关的逆向吸积盘形成率。发现了超大质量双黑洞系统的质量比分布与类星体逆向吸积盘的形成率之间存在定量关系,该定量关系可以通过未来的空间引力波探测以及逆向吸积盘的探测进行检验。
Black holes are objects predicted by general relativity theory.Black holes are also the central engines of many astronomical phenomena,including quasars,active galactic nuclei,jets,accretion disks and so on.General relativity indicates that black holes in the universe can be described by two parameters:mass and spin.Compared with the measurement of black hole’s mass,spin measurement is more difficult.However,the direction of spin is closely related to many astronomical phenomena.If the spin of a black hole coincides with the rotation direction of the accretion disk,a positive accretion disk will be formed;if the spin of a black hole is opposite to the rotation direction of the accretion disk,a reverse accretion astronomical phenomenon will be formed.The continuum spectrum fitting method and the ferrography method are widely used in the spin measurement for black holes.No plausible candidates for the reverse accretion disk have been found by these methods.However,recent studies have identified potential candidates for reverse accretion disks based on the analysis of the relationship between the responsivity weighted radius of the broad line region and optical luminosity(R-L relation).In this paper,a physical mechanism of reverse accretion disks formation is proposed based on the physical picture of the black hole mergers.And we have calculated the relative formation rates of reverse accretion disks.Interestingly,we find a quantitative relationship between the mass ratio distribution of supermassive binary black hole systems and the formation rate of quasar retrograde accretion disks.This quantitative relationship can be tested by future gravitational wave detection through space-based detectors and retrograde accretion disk detection.
作者
阎玮琛
赵天宇
曹周键
YAN Wei-chen;ZHAO Tian-yu;CAO Zhou-jian(The Department of Astronomy,Beijing Normal University,Beijing 100875,China)
出处
《天文学进展》
CSCD
北大核心
2019年第4期469-476,共8页
Progress In Astronomy
基金
国家自然科学基金(11690023,11622546)
中央高校基本科研业务费专项资金
关键词
双黑洞并合
数值相对论
黑洞逆向吸积
binary black hole merger
numerical relativity
retrograde accretion
