薄盘、厚矮星和反馈效应的重要性
Thin discs, thick dwarfs, and the importance of feedback effects
摘要：
通过测定两个不同的星系光度函数暗端（M_B < -8）的视轴比的概率分布，研究了恒星质量在塑造暗系统内禀厚度中的作用。我们发现（b/a）分布是M* 的强函数，并确定了一个极限恒星质量M* ~ 2 × 10^9 Msun，低于这个质量的星系开始系统地变厚。我们认为，这是星系质量，特定的角动量和恒星反馈效应之间复杂的相互作用的结果：在较低质量的星系湍流运动的重要性日益增加，导致形成较厚的系统。我们发现我们的结果和最新的矮星系形成的数值模拟之间有很好的一致性，并讨论了这一发现的几个进一步的影响-包括在昏暗的星系中形成的酒吧和螺旋，HI线轮廓和模拟环境对矮星系的影响。
英文摘要：
We investigate the role of stellar mass in shaping the intrinsic thickness of faint systems by determining the probability distribution of apparent axis ratios for two different samples that probe the faint end of the galaxy luminosity function (M_B < -8). We find that the (b/a) distribution is a strong function of M*, and identify a limiting stellar mass M* ~ 2x10^9 Msun below which galaxies start to be systematically thicker. We argue that this is the result of the complex interplay between galaxy mass, specific angular momentum and stellar feedback effects: the increasing importance of turbulent motions in lower mass galaxies leads to the formation of thicker systems. We find a good agreement between our results and the latest numerical simulations of dwarf galaxy formation, and discuss several further implications of this finding --including the formation of bars and spirals in faint galaxies, the deprojection of HI line profiles and simulations of environmental effects on dwarf galaxies.
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。
