Determination of Dark Matter Halo Mass from Dynamics of Satellite Galaxies
文献类型：期刊论文
| 作者 | Li,Zhao-Zhou2,3; Jing,Y. P.4,5; Qian,Yong-Zhong1,6; Yuan,Zhen4; Zhao,Dong-Hai2 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2017-11-22 |
| 卷号 | 850期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | dark matter galaxies: dwarf Galaxy: halo Galaxy: kinematics and dynamics methods: numerical methods: statistical |
| DOI | 10.3847/1538-4357/aa94c0 |
| 英文摘要 | Abstract We show that the mass of a dark matter halo can be inferred from the dynamical status of its satellite galaxies. Using nine dark matter simulations of halos like the Milky Way (MW), we find that the present-day substructures in each halo follow a characteristic distribution in the phase space of orbital binding energy and angular momentum, and that this distribution is similar from halo to halo, but has an intrinsic dependence on the halo formation history. We construct this distribution directly from the simulations for a specific halo and extend the result to halos of similar formation history but different masses by scaling. The mass of an observed halo can then be estimated by maximizing the likelihood in comparing the measured kinematic parameters of its satellite galaxies with these distributions. We test the validity and accuracy of this method with mock samples taken from the simulations. Using the positions, radial velocities, and proper motions of nine tracers and assuming observational uncertainties comparable to those of MW satellite galaxies, we find that the halo mass can be recovered to within . The accuracy can be improved to within ～25% if 30 tracers are used. However, the dependence of the phase-space distribution on the halo formation history sets a minimum uncertainty of that cannot be reduced by using more tracers. We believe that this minimum uncertainty also applies to any mass determination for a halo when the phase-space information of other kinematic tracers is used. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-850-2-AA94C0 |
| 源URL | [http://119.78.226.72/handle/331011/32093]  |
| 专题 | 中国科学院上海天文台 |
| 作者单位 | 1.Tsung-Dao Lee Institute, Shanghai 200240, China 2.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, 80 Nandan Road, Shanghai 200030, China; lizz@shao.ac.cn 3.University of the Chinese Academy of Sciences, No.19A Yuquan Road, Beijing 100049, China 4.Center for Astronomy and Astrophysics, School of Physics and Astronomy, Shanghai Jiao Tong University, 955 Jianchuan Road, Shanghai 200240, China; ypjing@sjtu.edu.cn 5.IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China 6.School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA |
| 推荐引用方式 GB/T 7714 | Li,Zhao-Zhou,Jing,Y. P.,Qian,Yong-Zhong,et al. Determination of Dark Matter Halo Mass from Dynamics of Satellite Galaxies[J]. The Astrophysical Journal,2017,850(2). |
| APA | Li,Zhao-Zhou,Jing,Y. P.,Qian,Yong-Zhong,Yuan,Zhen,&Zhao,Dong-Hai.(2017).Determination of Dark Matter Halo Mass from Dynamics of Satellite Galaxies.The Astrophysical Journal,850(2). |
| MLA | Li,Zhao-Zhou,et al."Determination of Dark Matter Halo Mass from Dynamics of Satellite Galaxies".The Astrophysical Journal 850.2(2017). |
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来源：上海天文台
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