The mass ratio distribution of MBH binaries in the hierarchical model

doi:10.1088/1674-4527/15/6/001

CSpace

	The mass ratio distribution of MBH binaries in the hierarchical model
	Xu, Sheng-Nian 1,2; Yuan, Ye-Fei 1; Hao, Jing-Meng 1; Tang, Ning-Yu 1
	2015-06-01
发表期刊	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
ISSN	1674-4527
卷号	15 期号:6 页码:773-784
摘要	We present different mass ratio distributions of massive black hole (MBH) binaries due to different mechanisms involved in binary evolution. A binary system of MBHs forms after the merger of two galaxies, which has three stages: the dynamical friction stage, the stellar scattering or circumbinary disk stage, and the gravitational radiation stage. The second stage was once believed to be the "final parsec problem" (FPP) as the binary stalled at this stage because of the depletion of stars. Now, the FPP has been shown to no longer be a problem. Here we get two different mass ratio distributions of MBH binaries under two mechanisms, stellar scattering and the circumbinary disk interaction. For the circumbinary disk mechanism, we assume that the binary shrinks by interaction with a circumbinary disk and the two black holes (BHs) have different accretion rates in the simulation. We apply this simple assumption to the hierarchical coevolution model of MBHs and dark matter halos, and we find that there will be more equal-mass MBH binaries in the final coalescence for the case where the circumbinary mechanism operates. This is mainly because the secondary BH in the circumbinary disk system accretes at a higher rate than the primary one.
关键词	cosmology: theory black hole physics galaxies: interaction
DOI	10.1088/1674-4527/15/6/001
语种	英语
资助项目	Chinese Scholarship Council (CSC) ; National Basic Research Program of China (973 program)[2012CB82180] ; Strategic Priority Research Program "The Emergence of Cosmological Structure" of the Chinese Academy of Sciences[XDB09000000] ; National Natural Science Foundation of China[11073020] ; National Natural Science Foundation of China[10733010] ; National Natural Science Foundation of China[11133005]
WOS研究方向	Astronomy & Astrophysics
WOS类目	Astronomy & Astrophysics
WOS记录号	WOS:000355138900001
出版者	NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
引用统计
文献类型	期刊论文
条目标识符	http://ir.amss.ac.cn/handle/2S8OKBNM/19871
专题	中国科学院数学与系统科学研究院
通讯作者	Xu, Sheng-Nian
作者单位	1.Univ Sci & Technol China, Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Hefei 230026, Peoples R China 2.Chinese Acad Sci, Acad Math & Syst Sci, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Xu, Sheng-Nian,Yuan, Ye-Fei,Hao, Jing-Meng,et al. The mass ratio distribution of MBH binaries in the hierarchical model[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2015,15(6):773-784.
APA	Xu, Sheng-Nian,Yuan, Ye-Fei,Hao, Jing-Meng,&Tang, Ning-Yu.(2015).The mass ratio distribution of MBH binaries in the hierarchical model.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,15(6),773-784.
MLA	Xu, Sheng-Nian,et al."The mass ratio distribution of MBH binaries in the hierarchical model".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 15.6(2015):773-784.