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arXiv 1011.4512astro-ph.CO
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重子相对于暗物质的流运动对第一恒星形成的影响

Effect of Streaming Motion of Baryons Relative to Dark Matter on the Formation of the First Stars

Athena Stacy, Volker Bromm, Abraham Loeb

摘要:

我们评估的重子和暗物质之间的超音速相对速度的第一气体云在z < 50的热和密度演化的效果。通过一系列的宇宙学模拟,初始化在z=100与一系列的相对流动速度和minihalo形成红移,我们发现,典型的流动速度将有气体演化的影响很小。一旦坍缩开始,气体的后续演化将与没有流的情况几乎无法区分,恒星形成仍将以相同的方式进行,特征性的Pop III恒星质量没有变化。预计再电离主要是由质量大于10^8太阳质量的晕所控制,因此流的预期影响可以忽略不计。

英文摘要:

We evaluate the effect of a supersonic relative velocity between the baryons and dark matter on the thermal and density evolution of the first gas clouds at z < 50. Through a series of cosmological simulations, initialized at z=100 with a range of relative streaming velocities and minihalo formation redshifts, we find that the typical streaming velocities will have little effect on the gas evolution. Once the collapse begins, the subsequent evolution of the gas will be nearly indistinguishable from the case of no streaming, and star formation will still proceed in the same way, with no change in the characteristic Pop III stellar masses. Reionization is expected to be dominated by halo masses of > 10^8 M_sun, for which the expected effect of streaming is negligible.

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