论文标题
用银河的卫星追踪星星卫星
Tracing stars in Milky Way satellites with A-SLOTH
论文作者
论文摘要
我们使用半分析模型a-Sloth研究了30个银河系的系统，以$ z = 0 $在30牛油道的系统（$ m_* <10^5 m_ \ odot $）制度中研究恒星质量到巨大的质量关系。一个新的模型使我们能够遵循恒星形成和来自单独采样的POP II恒星的随机恒星反馈。我们的基金模型通过良好的质量到质量质量关系产生一致的结果，这些质量是由丰度匹配得出的，并且观察到的累积恒星质量函数高于观察性的完整性。我们在超品种政权的恒星质量到荷兰质量关系中发现了一个高原。该高原的恒星质量告诉我们，在超新星发生之前形成了多少颗恒星，并调节了进一步的恒星形成，这取决于流行的恒星形成效率。我们还发现，随着$ m _* $减少，发光卫星的数量迅速增加，直到$ m_* \大约10^4 m_ \ odot $。最后，我们发现，在高红移时，巴元和暗物质之间的相对流速度对于确定$ z = 0 $的超生物矮星系的数量很重要。 A-Sloth中的新模型提供了一个框架，可以研究银河系及其卫星的恒星特性和金属贫困恒星的形成历史。
We study the stellar mass-to-halo mass relation at $z=0$ in 30 Milky Way-like systems down to the ultra-faint ($M_* < 10^5 M_\odot$) regime using the semi-analytic model A-SLOTH. A new model allows us to follow star formation and the stochastic stellar feedback from individually sampled Pop II stars. Our fiducial model produces consistent results with the stellar mass-to-halo mass relation derived from abundance matching and the observed cumulative stellar mass function above the observational completeness. We find a plateau in the stellar mass-to-halo mass relation in the ultra-faint regime. The stellar mass of this plateau tells us how many stars formed before supernovae occur and regulate further star formation, which is determined by the Pop~II star formation efficiency. We also find that the number of luminous satellites increases rapidly as $M_*$ decreases until $M_* \approx 10^4 M_\odot$. Finally, we find that the relative streaming velocity between baryons and dark matter at high redshift is important in determining the number of ultra-faint dwarf galaxies at $z=0$. The new model in A-SLOTH provides a framework to study the stellar properties and the formation history of metal-poor stars in Milky Way and its satellites.
