薄盘，厚矮星和恒星反馈的影响
Thin discs, thick dwarfs and the effects of stellar feedback
摘要：
我们调查恒星质量的作用，在塑造星系盘的内在厚度，通过确定的概率分布的视轴比（b/a）为两个不同的样本，探测星系光度函数的暗端。我们发现b/a分布具有典型的“U型”特征，并确定了一个极限质量M_* ~ 2 × 10^9 M_sun，低于这个极限质量，低质量星系开始系统地变厚。这种趋势适用于局部体积中的非常微弱的（M_B ~ -8）矮星，它们本质上是类球系统。我们认为，星系的形状是质量，比角动量和恒星反馈效应之间的复杂相互作用的结果。因此，低质量星系中湍流运动的重要性日益增加，导致了较厚系统的形成，这一结果得到了矮星系形成的最新流体动力学模拟和其他理论预期的支持。我们讨论了这一发现的几个影响，包括形成酒吧在昏暗的星系，去投影的HI线配置文件和模拟环境对矮星系人口的影响。
英文摘要：
We investigate the role of stellar mass in shaping the intrinsic thickness of galaxy discs by determining the probability distribution of apparent axis ratios (b/a) for two different samples that probe the faint end of the galaxy luminosity function. We find that the b/a distribution has a characteristic 'U-shape' and identify a limiting mass M_* ~ 2x10^9 M_sun below which low-mass galaxies start to be systematically thicker. This tendency holds for very faint (M_B ~ -8) dwarfs in the Local Volume, which are essentially spheroidal systems. We argue that galaxy shape is the result of the complex interplay between mass, specific angular momentum and stellar feedback effects. Thus, the increasing importance of turbulent motions in lower mass galaxies leads to the formation of thicker systems, a result supported by the latest hydrodynamical simulations of dwarf galaxy formation and other theoretical expectations. We discuss several implications of this finding, including the formation of bars in faint galaxies, the deprojection of HI line profiles and simulations of environmental effects on the dwarf galaxy population.
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