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The distribution of stars around the Milky Way's central black hole III. Comparison with simulations
Baumgardt, H.1; Amaro-Seoane, P.2,3,4,5,6; Schodel, R.7
2018
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN1432-0746
Volume609Pages:6
AbstractContext. 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.
Keywordmethods: numerical Hertzsprung-Russell and C-M diagrams stars: kinematics and dynamics Galaxy: centre Galaxy: nucleus
DOI10.1051/0004-6361/201730462
Language英语
Funding ProjectEuropean 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 Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000418963900028
PublisherEDP SCIENCES S A
Citation statistics
Document Type期刊论文
Identifierhttp://ir.amss.ac.cn/handle/2S8OKBNM/26975
Collection中国科学院数学与系统科学研究院
Corresponding AuthorBaumgardt, H.
Affiliation1.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
Recommended Citation
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.
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