标题： 反馈与矮星系恒星晕的形成 显示英文标题

标题： Feedback and the Formation of Dwarf Galaxy Stellar Halos

摘要： 恒星群体研究表明，在所有环境中，低质量星系都表现出比星系主体更古老且更为球对称分布的恒星晕。在某些情况下，存在一个显著的中间年龄组分，延伸至年轻盘之外。我们检查了一组平滑粒子流体动力学（SPH）模拟，并发现早期恒星形成活动增强以及超新星反馈可以为模型星系产生一种扩展的恒星分布，这种分布与这些晕类似，适用于从$v_{200}$= 15 km/s$^{-1}$到 35 km/s$^{-1}$的星系，而无需亚晕吸积。 显示英文摘要

摘要： Stellar population studies show that low mass galaxies in all environments exhibit stellar halos that are older and more spherically distributed than the main body of the galaxy. In some cases, there is a significant intermediate age component that extends beyond the young disk. We examine a suite of Smoothed Particle Hydrodynamic (SPH) simulations and find that elevated early star formation activity combined with supernova feedback can produce an extended stellar distribution that resembles these halos for model galaxies ranging from $v_{200}$ = 15 km s$^{-1}$ to 35 km s$^{-1}$, without the need for accretion of subhalos.