Breathing in Low-Mass Galaxies: A Study of Episodic Star Formation
Breathing in Low-Mass Galaxies: A Study of Episodic Star Formation
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低质量星系的呼吸：幕式恒星形成的研究
DOI：
10.1086/520504
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
J. Wadsley
中科院分区：
文献类型：
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作者：
G. Stinson;J. Dalcanton;Thomas R. Quinn;T. Kaufmann;J. Wadsley
我们使用SPH + N-体模拟，包括超新星反馈的影响的物理动机的描述，模拟孤立矮星系的崩溃。随着气体的坍缩和恒星的形成，超新星的反馈干扰了足够的气体，暂时抑制了星星的形成。气体向外流入一个热晕，在那里它冷却，直到星星的形成可以再次继续，循环重复。孤立的本星系群矮星系的星星形成历史也表现出类似的星星形成爆发。我们研究了恒星速度色散的质量依赖性，发现它们不小于在维里半径处测量的晕速度的一半。
We simulate the collapse of isolated dwarf galaxies using SPH + N-body simulations including a physically motivated description of the effects of supernova feedback. As the gas collapses and stars form, the supernova feedback disrupts enough gas to temporarily quench star formation. The gas flows outward into a hot halo, where it cools until star formation can continue once more and the cycle repeats. The star formation histories of isolated Local Group dwarf galaxies exhibit similar episodic bursts of star formation. We examine the mass dependence of the stellar velocity dispersions and find that they are no less than half the velocity of the halos measured at the virial radius.