Sizing from the smallest scales: the mass of the Milky Way
Sizing from the smallest scales: the mass of the Milky Way
复制标题
从最小的尺度来衡量：银河系的质量
DOI：
10.1093/mnras/stac1265
复制
发表时间：
2022
影响因子：
4.8
通讯作者：
Simon, J. D.
中科院分区：
文献类型：
--
作者：
Rodriguez Wimberly, M. K.;Cooper, M. C.;Baxter, D. C.;Boylan-Kolchin, M.;Bullock, J. S.;Fillingham, S. P.;Ji, A. P.;Sales, L. V.;Simon, J. D.
随着银河系及其卫星系统在近场宇宙学研究中的地位越来越稳固，对银河系暗物质晕的精确质量估计的需求变得越来越迫切。随着第二次和早期第三次来自盖亚的恒星固有运动数据的发布，几个小组计算了银河系卫星星系人口的完整6D相空间信息。利用这些数据与Phat ELVIS模拟得出的亚晕特性进行比较，我们将银河系暗物质晕质量限制在1-1.2 × 1012M⊙。我们发现，从质量较大或较小的宿主（即>1.2 × 1012M⊙或<1012M⊙）获得的亚晕的运动学在3σ置信水平上与银河系卫星观测到的速度不一致。银河系的首选宿主光晕质量在很大程度上对与大麦哲伦星云相关的系统的排除、星系形成阈值的变化以及观测完整性的变化不敏感。随着越来越多的银河系卫星被发现，它们的速度（径向、切向和总速度）加上以星系为中心的距离，将进一步深入了解银河系暗物质晕的质量。
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 fromGaia, 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 ∼1–1.2 × 1012M⊙. We find that the kinematics of subhaloes drawn from more- or less-massive hosts (i.e. >1.2 × 1012M⊙or <1012M⊙) are inconsistent, at the 3σ 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.