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arXiv 0905.0314astro-ph.COastro-ph.GA
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星爆驱动的星系外流

Starburst--driven galactic outflows

Biman B. Nath, Joseph Silk

摘要:

我们提出了一个模型的恒星暴驱动的星系外流,其动力学依赖于辐射和热压力。热压力驱动风的标准模型无法解释在低和高红移星系外流的一些关键观测。我们讨论一个场景,其中来自恒星星族中大质量恒星的辐射压力驱动气体和尘埃壳层。随后的超新星(SN)爆炸从这个群体中最大的恒星,然后驱动恒星喷出物在稀薄的介质中向外,使其与辐射压力驱动的壳层碰撞。碰撞给壳层带来了新的动量,由此产生的再加速使壳层瑞利-泰勒不稳定,使壳层破碎。我们表明,这些弹道碎片的速度可以解释一些最近观察到的风速,红化和恒星形成率之间的相关性在莱曼break星系。

英文摘要:

We propose a model of starburst--driven galactic outflows whose dynamics depends 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 (SN) explosions from the most massive stars in this population then drive stellar ejecta outward 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 between wind speed, reddening and star formation rate.

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