Dynamical Evolution of Cosmic Supermassive Binary Black Holes and Their Gravitational-wave Radiation
文献类型：期刊论文
| 作者 | Chen,Yunfeng1; Yu,Qingjuan1; Lu,Youjun2,3
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| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2020-07-01 |
| 卷号 | 897期号:1 |
| 关键词 | Astrodynamics Gravitational waves Cosmological evolution Galaxy dynamics Galaxy mergers Galaxy nuclei Gravitational wave astronomy Supermassive black holes |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab9594 |
| 英文摘要 | Abstract We investigate the evolution of supermassive binary black holes (BBHs) in galaxies with realistic property distributions and the gravitational-wave (GW) radiation from the cosmic population of these BBHs. We incorporate a comprehensive treatment of the dynamical interactions of the BBHs with their environments by including the effects of galaxy triaxial shapes and inner stellar distributions, and generate a large number of BBH evolution tracks. By combining these BBH evolution tracks, galaxy mass functions, galaxy merger rates, and supermassive black hole–host galaxy relations into our model, we obtain statistical distributions of surviving BBHs, BBH coalescence rates, the strength of their GW radiation, and the stochastic GW background (GWB) contributed by the cosmic BBH population. About ～1%–3% (or ) of supermassive BHs at nearby galactic centers are expected to be binaries with mass ratio (or ). The characteristic strain amplitude of the GWB at frequency is estimated to be , and the upper bound of its results obtained with the different BH–host galaxy relations can be up to , which await testing by future experiments (e.g., the Square Kilometer Array, FAST, Next-Generation Very Large Array). The turnover frequency of the GWB spectrum is at . The uncertainties on the above estimates and prospects for detecting individual sources are also discussed. The application of the cosmic BBH population to the Laser Interferometer Space Antenna (LISA) band provides a lower limit to the detection rate of BBHs by LISA, . |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-897-1-AB9594 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/63056]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Kavli Institute for Astronomy and Astrophysics, and School of Physics, Peking University, Beijing, 100871, People’s Republic of China; yuqj@pku.edu.cn 2.National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, People’s Republic of China 3.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Chen,Yunfeng,Yu,Qingjuan,Lu,Youjun. Dynamical Evolution of Cosmic Supermassive Binary Black Holes and Their Gravitational-wave Radiation[J]. The Astrophysical Journal,2020,897(1). |
| APA | Chen,Yunfeng,Yu,Qingjuan,&Lu,Youjun.(2020).Dynamical Evolution of Cosmic Supermassive Binary Black Holes and Their Gravitational-wave Radiation.The Astrophysical Journal,897(1). |
| MLA | Chen,Yunfeng,et al."Dynamical Evolution of Cosmic Supermassive Binary Black Holes and Their Gravitational-wave Radiation".The Astrophysical Journal 897.1(2020). |
入库方式： OAI收割
来源：国家天文台
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