论文标题
星系恒星种群的阴暗面I：恒星至北路的质量关系和速度分散 - 光晕质量关系
The dark side of galaxy stellar populations I: The stellar-to-halo mass relation and the velocity dispersion - halo mass relation
论文作者
论文摘要
星系的生长和特性被认为与宿主暗物质光晕的生长和特性密切相关。尽管这种所谓的Galaxy-Halo连接非常重要，但暗物质光环在调节观察到的星系特性中的潜在作用尚未完全了解。在这项工作中，我们从Sloan Digital Sky对附近中央星系调查的光谱中得出了年龄，金属矿和[Mg/Fe]丰度，并根据其宿主光晕进行了研究。我们研究了恒星到升性的质量关系和速度分散体的散射 - 光环质量关系与这些恒星种群参数相关。此外，我们还研究区分不同星系形态和环境时的差异。我们发现，星系的年龄和化学富集不是由它们的恒星质量或速度分散剂完全确定的，而是取决于宿主光晕的质量。我们的发现表明，速度分散是恒星种群参数的最佳代理，其光环质量扮演着次要而明显的角色。我们解释说，这些关系的分散与年龄和金属性之间的相关性的起源可能与不同的光环形成时间有关。
The growth and properties of galaxies are thought to be closely connected to the ones of their host dark matter halos. Despite the importance of this so-called galaxy-halo connection, the potential role of dark matter halos in regulating observed galaxy properties remains yet to be fully understood. In this work, we derive the ages, metallicites and [Mg/Fe] abundances from optical spectra from the Sloan Digital Sky Survey of nearby central galaxies, and study them in terms of their host halos. We investigate how the scatter in the stellar-to-halo mass relation and the velocity dispersion - halo mass relation correlates with these stellar population parameters. In addition, we also study the differences when distinguishing between different galaxy morphologies and environments. We find that the ages and chemical enrichment of galaxies are not fully determined by their stellar masses or velocity dispersion, but also depend on the mass of the host halos. Our findings suggest that the velocity dispersion is the best proxy of the stellar population parameters with halo mass playing a secondary yet noticeable role. We interpret that the origin of the correlation between the scatter of these relations and the ages and metallicities might be related to different halo formation times.
