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arXiv 1409.4482astro-ph.CO
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吸积暗物质晕中的回溅

Splashback in accreting dark matter halos

Susmita Adhikari, Neal Dalal, Robert T. Chamberlain

摘要:

最近的研究表明,暗物质晕外围的密度分布在很窄的半径范围内会变得非常陡峭。这种行为是由回溅物质在吸积后第一次通过离心时产生的。我们表明,这个回溅功能的位置可以很简单地理解,从第一原理。我们提出了一个简单的模型,球形崩溃的基础上,准确地预测溅回的位置,没有任何自由参数。决定回溅半径的重要物理量是吸积率和红移。

英文摘要:

Recent work has shown that density profiles in the outskirts of dark matter halos can become extremely steep over a narrow range of radius. This behavior is produced by splashback material on its first apocentric passage after accretion. We show that the location of this splashback feature may be understood quite simply, from first principles. We present a simple model, based on spherical collapse, that accurately predicts the location of splashback without any free parameters. The important quantities that determine the splashback radius are accretion rate and redshift.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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