Starburst-driven galactic outflows
Starburst-driven galactic outflows
复制标题
星暴驱动的银河流出
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
J. Silk
中科院分区：
文献类型：
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作者：
B. Nath;J. Silk
我们提出了一个星暴驱动的星系外流模型，其动力学取决于辐射和热压。热压驱动风的标准模型无法解释低红移和高红移星系流出的一些关键观测结果。我们讨论了一种情况，其中恒星群中大质量恒星的辐射压力驱动气体和尘埃壳。随后，该族群中质量最大的恒星发生超新星爆炸，将恒星喷射物在稀薄介质中向外喷射，使其与辐射压力驱动的壳层发生碰撞。碰撞为壳体提供了新的动量，由此产生的重新加速使壳体瑞利-泰勒不稳定，从而使壳体破碎。我们证明，这些弹道碎片的速度可以解释最近在莱曼断裂星系中观察到的风速、红化和恒星形成率之间的一些相关性。
We propose a model of starburst-driven galactic outflows whose dynamics depend on both radiation and thermal pressure. Standard models of thermal pressure-driven winds fail to explain some key observations of outflows at low- and high-redshift galaxies. We discuss a scenario in which radiation pressure from massive stars in a stellar population drive a shell of gas and dust. Subsequent supernova explosions from the most massive stars in this population then drive stellar ejecta outwards in a rarefied medium, making it collide with the radiation-pressure-driven shell. The collision imparts renewed momentum to the shell, and the resulting re-acceleration makes the shell Rayleigh–Taylor unstable, fragmenting the shell. We show that the speed of these ballistic fragments can explain some recently observed correlations in Lyman break galaxies among wind speed, reddening and star formation rate.