Sizing from the smallest scales: the mass of the Milky Way

被引：13

作者：

Wimberly, M. K. Rodriguez ^{[1
,2
]}

Cooper, M. C. ^{[2
]}

Baxter, D. C. ^{[2
]}

Boylan-Kolchin, M. ^{[3
]}

Bullock, J. S. ^{[2
]}

Fillingham, S. P. ^{[4
]}

Ji, A. P. ^{[5
]}

Sales, L., V ^{[1
]}

Simon, J. D. ^{[6
]}

机构：

[1] Univ Calif Riverside, Dept Phys & Astron, 900 Univ Ave, Riverside, CA 92507 USA

[2] Univ Calif Irvine, Ctr Cosmol, Dept Phys & Astron, 4129 Reines Hall, Irvine, CA 92697 USA

[3] Univ Texas Austin, Dept Astron, 2515 Speedway,Stop C1400, Austin, TX 78712 USA

[4] Univ Washington, Dept Astron, Box 351580, Seattle, WA 98195 USA

[5] Univ Chicago, Dept Astron & Astrophys, Chicago, IL 60637 USA

[6] Observ Carnegie Inst Sci, Pasadena, CA 91101 USA

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2022年 / 513卷 / 04期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

Galaxy: fundamental parameters; galaxies: dwarf; galaxies: evolution; galaxies: general; galaxies: kinematics and dynamics; Local Group; DWARF SPHEROIDAL GALAXY; SATELLITE GALAXIES; VARIABLE-STARS; SPATIAL-DISTRIBUTION; GALACTIC SATELLITES; MAGELLANIC CLOUDS; PROPER MOTIONS; LOCAL GROUP; THIN PLANE; SIMULATIONS;

D O I：

10.1093/mnras/stac1265

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

As the Milky Way and its satellite system become more entrenched in near field cosmology efforts, the need for an accurate mass estimate of the Milky Way's dark matter halo is increasingly critical. With the second and early third data releases of stellar proper motions from Gaia, several groups calculated full 6D phase-space information for the population of Milky Way satellite galaxies. Utilizing these data in comparison to subhalo properties drawn from the Phat ELVIS simulations, we constrain the Milky Way dark matter halo mass to be similar to 1-1.2 x 10(12) M-circle dot. We find that the kinematics of subhaloes drawn from more- or less-massive hosts (i.e. >1.2 x 10(12) M-circle dot or <10(12) M-circle dot) are inconsistent, at the 3 sigma confidence level, with the observed velocities of the Milky Way satellites. The preferred host halo mass for the Milky Way is largely insensitive to the exclusion of systems associated with the Large Magellanic Cloud, changes in galaxy formation thresholds, and variations in observational completeness. As more Milky Way satellites are discovered, their velocities (radial, tangential, and total) plus Galactocentric distances will provide further insight into the mass of the Milky Way dark matter halo.

引用

页码：4968 / 4982

页数：15

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