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arXiv 2207.05099astro-ph.GA
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第一次坠落是最困难的:在星系团和星系团中心潮汐剥离作用中,特殊的星系动力学在坠落时的重要性

The First Fall is the Hardest: The Importance of Peculiar Galaxy Dynamics at Infall Time for Tidal Stripping Acting at the Centers of Groups and Clusters

Rory Smith, Paula Calderon-Castillo, Jihye Shin, Mojtaba Raouf, Jongwan Ko

摘要:

利用暗物质的N体宇宙学模拟,我们测量了暗物质晕在第一次落入群晕和团晕时的近心距。我们发现,pericentre距离(R $_{\rm{peri}}$)是一个重要的参数,因为它显着影响的强度潮汐质量损失在密集的环境,以及可能的其他环境机制。我们研究什么决定R $_{\rm{peri}}$值,并发现,对于大多数infallers,占主导地位的参数是V $_{\rm{\perp}}$,切向分量的轨道速度的晕进入组/集群晕的第一次。这意味着潮汐剥离的强度附近的核心组/集群的强烈影响的外部特有的速度场的大尺度结构周围,这是不同的集群之间,是敏感的质量比的infaller主机。我们发现,细丝馈电也部分有助于低V $_{\rm{\perp}}$晕馈电。动力摩擦也可以在减少R $_{\rm{peri}}$中起作用,但这仅对那些相对大质量的少数撞击物($>$ 10\%的宿主质量)有意义。这些结果突出了星系对致密环境的反应如何敏感地依赖于从这些致密环境之外继承的动力学。

英文摘要:

Using dark matter only N-body cosmological simulations, we measure the pericentre distance of dark matter halos on their first infall into group and cluster halos. We find that the pericentre distance (R$_{\rm{peri}}$) is an important parameter as it significantly affects the strength of tidal mass loss in dense environments, and likely other environmental mechanisms as well. We examine what determines the R$_{\rm{peri}}$ value and find that, for most infallers, the dominant parameter is V$_{\rm{\perp}}$, the tangential component of the orbital velocity as the halo enters the group/cluster halo for the first time. This means that the strength of tidal stripping acting near the cores of groups/clusters are strongly influenced by the external peculiar velocity field of the large scale structure surrounding them, which differs between clusters, and is sensitive to the mass ratio of infaller to host. We find that filament feeding also partially contributes to feeding in low V$_{\rm{\perp}}$ halos. Dynamical friction can also play a role in reducing R$_{\rm{peri}}$ but this is only significant for those few relatively massive infallers ($>$10\% of the mass of their host). These results highlight how the response of galaxies to dense environments will sensitively depend on dynamics inherited from far outside those dense environments.

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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