Feedback and the formation of dwarf galaxy stellar haloes
Feedback and the formation of dwarf galaxy stellar haloes
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矮星系恒星晕的反馈和形成
DOI：
10.1111/j.1365-2966.2009.14555.x
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发表时间：
2009
影响因子：
4.8
通讯作者：
UC Irvine
中科院分区：
文献类型：
--
作者：
G. Stinson;J. Dalcanton;T. Quinn;S. Gogarten;T. Kaufmann;James Wadsley McMaster University;U. Washington;UC Irvine
恒星族群研究显示，所有环境中的低质量星系都呈现出比星系主体更古老、更球形分布的恒星晕。在某些情况下，有一个显着的中间年龄的组成部分，延伸到年轻的椎间盘。我们研究了一套光滑粒子流体动力学模拟，发现早期星星形成活动的提高与超新星反馈相结合，可以产生一个扩展的恒星分布，类似于这些模型星系的晕，从ν 200 = 15至35 km s-1，而不需要吸积的subhaloes。
Stellar population studies show that low-mass galaxies in all environments exhibit stellar haloes 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 disc. We examine a suite of Smoothed Particle Hydrodynamic simulations and find that elevated early star formation activity combined with supernova feedback can produce an extended stellar distribution that resembles these haloes for model galaxies ranging from ν 200 = 15 to 35 km s -1 , without the need for accretion of subhaloes.