The distribution of stars around the Milky Way's central black hole III. Comparison with simulations
文献类型：期刊论文
| 作者 | Baumgardt, H.1; Amaro-Seoane, P.2,3,4,5,6; Schodel, R.7 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2018 |
| 卷号 | 609页码:6 |
| 关键词 | methods: numerical Hertzsprung-Russell and C-M diagrams stars: kinematics and dynamics Galaxy: centre Galaxy: nucleus |
| ISSN号 | 1432-0746 |
| DOI | 10.1051/0004-6361/201730462 |
| 英文摘要 | Context. The distribution of stars around a massive black hole (MBH) has been addressed in stellar dynamics for the last four decades by a number of authors. Because of its proximity, the centre of the Milky Way is the only observational test case where the stellar distribution can be accurately tested. Past observational work indicated that the brightest giants in the Galactic centre (GC) may show a density deficit around the central black hole, not a cusp-like distribution, while we theoretically expect the presence of a stellar cusp. Aims. We here present a solution to this long-standing problem. Methods. We performed direct-summation N-body simulations of star clusters around massive black holes and compared the results of our simulations with new observational data of the GC's nuclear cluster. Results. We find that after a Hubble time, the distribution of bright stars as well as the diffuse light follow power-law distributions in projection with slopes of approximate to 0.3 in our simulations. This is in excellent agreement with what is seen in star counts and in the distribution of the diffuse stellar light extracted from adaptive-optics (AO) assisted near-infrared observations of the GC. Conclusions. Our simulations also confirm that there exists a missing giant star population within a projected radius of a few arcsec around Sgr A*. Such a depletion of giant stars in the innermost 0.1 pc could be explained by a previously present gaseous disc and collisions, which means that a stellar cusp would also be present at the innermost radii, but in the form of degenerate compact cores. |
| 资助项目 | European Research Council under the European Union's Seventh Framework Programme/ERC[614922] ; Ramon y Cajal Programme of the Ministry of Economy, Industry and Competitiveness of Spain ; CAS President's International Fellowship Initiative |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000418963900028 |
| 出版者 | EDP SCIENCES S A |
| 源URL | [http://ir.amss.ac.cn/handle/2S8OKBNM/26974]  |
| 专题 | 中国科学院数学与系统科学研究院 |
| 通讯作者 | Baumgardt, H. |
| 作者单位 | 1.Univ Queensland, Sch Math & Phys, St Lucia, Qld 4072, Australia 2.CSIC, ICE, Inst Space Sci, Campus UAB,Carrer Can Magrans S-N, Barcelona 08193, Spain 3.IEEC, Campus UAB,Carrer Can Magrans S-N, Barcelona 08193, Spain 4.Chinese Acad Sci, Acad Math & Syst Sci, Inst Appl Math, Beijing 100190, Peoples R China 5.Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China 6.TU Berlin, Zentrum Astron & Astrophys, Hardenbergstr 36, D-10623 Berlin, Germany 7.Inst Astrofis Andalucia, Glorieta Astron S-N, E-18080 Granada, Spain |
| 推荐引用方式 GB/T 7714 | Baumgardt, H.,Amaro-Seoane, P.,Schodel, R.. The distribution of stars around the Milky Way's central black hole III. Comparison with simulations[J]. ASTRONOMY & ASTROPHYSICS,2018,609:6. |
| APA | Baumgardt, H.,Amaro-Seoane, P.,&Schodel, R..(2018).The distribution of stars around the Milky Way's central black hole III. Comparison with simulations.ASTRONOMY & ASTROPHYSICS,609,6. |
| MLA | Baumgardt, H.,et al."The distribution of stars around the Milky Way's central black hole III. Comparison with simulations".ASTRONOMY & ASTROPHYSICS 609(2018):6. |
入库方式： OAI收割
来源：数学与系统科学研究院
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