A Versatile and Accurate Method for Halo Mass Determination from Phase-space Distribution of Satellite Galaxies

A Versatile and Accurate Method for Halo Mass Determination from Phase-space Distribution of Satellite Galaxies
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一种根据卫星星系相空间分布确定晕质量的通用且准确的方法

DOI:
10.3847/1538-4357/ab4f6d
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发表时间:
2019-10
影响因子:
4.9
通讯作者:
Jing Y. P.
Jing Y. P.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Li Zhao-Zhou;Qian Yong-Zhong;Han Jiaxin;Wang Wenting;Jing Y. P.

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我们提出了一个通用的和准确的方法来估计晕的质量和浓度的卫星星系的运动学。根据不同晕圈内部动力学的相似性,我们从宇宙学模拟中构造了卫星的6D相空间分布函数。在贝叶斯统计框架内,我们不仅可以有效地推断晕的质量和浓度,我们还可以以严格和直接的方式处理各种观测效应,包括选择函数,不完整的数据和测量误差。通过模拟样本的测试,我们表明,我们的方法是有效的和准确的,以及更精确的纯稳态方法。它可以限制晕质量在± 20%,仅使用20个示踪剂,并有一个小的固有的不确定度± 10%。除了明确的应用到银河系和类似的星系,我们的方法可以扩展到星系群或星系团。
We propose a versatile and accurate method to estimate the halo mass and concentration from the kinematics of satellite galaxies. We construct the 6D phase-space distribution function of satellites from a cosmological simulation based on the similarity of internal dynamics for different halos. Within the Bayesian statistical framework, not only can we efficiently infer the halo mass and concentration, we can also treat various observational effects, including the selection function, incomplete data, and measurement errors, in a rigorous and straightforward manner. Through tests with mock samples, we show that our method is valid and accurate, as well as more precise than pure steady-state methods. It can constrain the halo mass to within ∼20% using only 20 tracers and has a small intrinsic uncertainty of ∼10%. In addition to the clear application to the Milky Way and similar galaxies, our method can be extended to galaxy groups or clusters.
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发表时间: 2014-07-11
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