Determination of Dark Matter Halo Mass from Dynamics of Satellite Galaxies
文献类型：期刊论文
| 作者 | Li, Zhao-Zhou1,2; Jing, Y. P.3,4; Qian, Yong-Zhong5,6; Yuan, Zhen3; Zhao, Dong-Hai1 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2017-12-01 |
| 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 | 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 similar to 40%. The accuracy can be improved to within similar to 25% if 30 tracers are used. However, the dependence of the phase-space distribution on the halo formation history sets a minimum uncertainty of similar to 20% 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. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000416005400006 |
| 源URL | [http://119.78.226.72/handle/331011/32449]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Li, Zhao-Zhou |
| 作者单位 | 1.Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China 2.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 3.Shanghai Jiao Tong Univ, Sch Phys & Astron, Ctr Astron & Astrophys, 955 Jianchuan Rd, Shanghai 200240, Peoples R China 4.Shanghai Jiao Tong Univ, IFSA Collaborat Innovat Ctr, Shanghai 200240, Peoples R China 5.Univ Minnesota, Sch Phys & Astron, Minneapolis, MN 55455 USA 6.Tsung Dao Lee Inst, Shanghai 200240, Peoples R China |
| 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]. 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.ASTROPHYSICAL JOURNAL,850(2). |
| MLA | Li, Zhao-Zhou,et al."Determination of Dark Matter Halo Mass from Dynamics of Satellite Galaxies".ASTROPHYSICAL JOURNAL 850.2(2017). |
入库方式： OAI收割
来源：上海天文台
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