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arXiv 2510.09604astro-ph.GA
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银河系类银河系星系中假想恒星流目录

Catalog of Mock Stellar Streams in Milky Way-Like Galaxies

University of Michigan(密歇根大学)

Colin Holm-Hansen, Yingtian Chen, Oleg Y. Gnedin

AI总结:

本文通过模拟生成四个类银河系星系中的恒星流目录,用于研究恒星流的性质及暗物质探测。

摘要:

动态冷的恒星流从潮汐溶解的球状星团中产生,是测量银河系质量分布和探测暗物质性质的优良工具。为此,我们从宇宙学模拟中生成了四个类银河系星系中的假想恒星流目录。该目录包含三个主要部分:基于宇宙学模拟的球状星团形成和破坏模型、基于基函数展开的时间依赖势能用于积分流轨道、以及改进的粒子喷射算法用于高效生成恒星流。我们生成了Gaia、LSST和Roman的假想光度数据,并发现后两者调查将增加可观察恒星数量几个数量级,其中LSST单独可以观察到1000或多颗恒星在40-100条流中。此外,我们发现假想流的可观察宽度和长度随银心距的变化可以用幂律描述,斜率为-1.8和-2的流在10kpc之外。我们的完整目录包含四个不同星系现实中的流群体,已公开可用,可用于研究流群体统计和校准使用恒星流理解银河系的模型。

英文摘要:

Dynamically cold stellar streams from tidally dissolved globular clusters (GCs) serve as excellent tools to measure the Galactic mass distribution and show promise to probe the nature of dark matter. For successful application of these tools to observations, it is essential to have models of stellar stream properties on the Galactic scale. To this end we produce a mock catalog of stellar streams in four Milky Way-mass galaxies from cosmological simulations. We build the catalog with three main components: a model for the formation and disruption of globular clusters based on cosmological simulations, time-dependent potentials constructed with basis function expansions for integrating stream orbits, and an improved particle-spray algorithm for efficient generation of stellar streams. We generate mock photometry for Gaia, LSST, and Roman, and find that the latter two surveys will increase the number of observable stars in GC stellar streams by several orders of magnitude, with LSST alone being able to observe 1000 or more stars in 40-100 streams beyond the stellar disk. In addition, we find that the observable widths and lengths of mock streams as a function of galactocentric radius are well described by power-laws with slopes of $-1.8$ and $-2$ for streams beyond 10~kpc. Our full catalog, containing stream populations across four different galaxy realizations, is publicly available and can be used to study stream population statistics and to calibrate models which use stellar streams to understand our Galaxy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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