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《天文和天体物理学研究(英文版)》 2015-06
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The mass ratio distribution of MBH binaries in the hierarchical model

Sheng-Nian Xu;Ye-Fei Yuan;Jing-Meng Hao;Ning-Yu Tang;Key Laboratory for Research in Galaxies and Cosmology, University of Science and Technology of China, Chinese Academy of Sciences;Academy of Mathematics and Systems Science, Chinese Academy of Sciences;  
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.
【Fund】: Supported by the National Natural Science Foundation of China
【CateGory Index】: P145.8
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【Citations】
Chinese Journal Full-text Database 1 Hits
1 XU ShengNian1,2 & YUAN YeFei1,2 1 CAS Key Laboratory for Research in Galaxies and Cosmology,Hefei 230026,China;2 Department of Astronomy,University of Science and Technology of China,Hefei 230026,China;Cosmological evolution of massive black holes at the center of galaxies[J];Scientia Sinica(Physica,Mechanica & Astronomica);2012-11
【Co-citations】
Chinese Journal Full-text Database 3 Hits
1 YUAN Ye-fei;Department of Astronomy,University of Science and Technology of China;CAS Key Laboratory for Research in Galaxies and Cosmology;;Numerical Simulation on Spherical Accretion Flow[J];Journal of Anhui Normal University(Natural Science);2014-05
2 Dong-Yao Zhao;Chang-Shuo Yan;Youjun Lu;National Astronomical Observatories,Chinese Academy of Sciences;;The clustering of QSOs and the dark matter halos that host them[J];天文和天体物理学研究(英文版);2013-10
3 GONG Xue-fei;XU Sheng-nian;YUAN Ye-fei;BAI Shan;BIAN Xing;CAO Zhou-jian;CHEN Ge-rui;DONG Peng;GAO Tian-shu;GAO Wei;HUANG Shuang-lin;LIU Ying;LUO Zi-ren;SHAO Ming-xue;SUN Bao-san;TANG Wen-lin;Yu Pin;XU Peng;ZANG Yun-long;ZHANG Hai-peng;LAU Yun-kau;Academy of Mathematics and Systems Science,Chinese Academy of Sciences;University of Science and Technology of China,Department of Astronomy;Theoretisch-Physikalisches Institut,Friedrich-Schiller-Universitat Jena,D-07743 Jena,Germany;University of Chinese Academy of Sciences;State Key Laboratory of Scientific and Engineering Computing,Academy of Mathematics and Systems Science,Chinese Academy of Sciences;State Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences;Beijing University of Technology,College of Applied Sciences;Morningside Center of Mathematics,Chinese Academy of Sciences;Capital Normal University;Henan University,Department of Mathematics;Institute of Mechanics,Chinese Academy of Sciences;Henan Polytechnic University;Huazhong University of Science and Technology,School of Physics;Tshinghua University,Mathematical Sciences Center;Institute of Theoretical Physics,Chinese Academy of Sciences;;Laser Interferometric Gravitational Wave Detection in Space and Structure Formation in the Early Universe[J];Progress in Astronomy;2015-01
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