核心势上的外部质量积累：对星团、星系团和星系团的意义
External Mass Accumulation onto Core Potentials: Implications for Star Clusters, Galaxies and Galaxy Clusters
摘要：
吸积问题的研究主要集中在具有质点引力势的物体的绕流问题上，而对于非质点分布的物体，则鲜有一般性的结果。在这里，我们研究的吸积流到非发散，核心潜力移动通过背景介质。本文以Plummer势和Hernquist势为例，研究了在各种天体物理环境中气体对星团、矮星系晕和大星系晕以及星系团的吸积作用。使用模拟和分析结果的核心潜力，集体从外部介质中吸积大量的气体所需的一般条件。星系核、矮星系和星团中大量物质积累的后果是双重的。首先，如果气体有效地冷却，恒星形成可以被触发，在系统中产生新的恒星成员。第二，如果系统的集体势能能够在气体吸积到单个核心成员之前改变周围气体的性质，那么增大的质量供应率可以显著改变各种吸积恒星星族的状态，并导致中心黑洞吸积光度的增强。
英文摘要：
Accretion studies have been focused on the flow around bodies with point mass gravitational potentials, but few general results are available for non-point mass distributions. Here, we study the accretion flow onto non-divergent, core potentials moving through a background medium. We use Plummer and Hernquist potentials as examples to study gas accretion onto star clusters, dwarf and large galaxy halos and galaxy clusters in a variety of astrophysical environments. The general conditions required for a core potential to collectively accrete large quantities of gas from the external medium are derived using both simulations and analytic results. The consequences of large mass accumulation in galaxy nuclei, dwarf galaxies and star clusters are twofold. First, if the gas cools effectively star formation can be triggered, generating new stellar members in the system. Second, if the collective potential of the system is able to alter the ambient gas properties before the gas is accreted onto the individual core members, the augmented mass supply rates could significantly alter the state of the various accreting stellar populations and result in an enhanced central black hole accretion luminosity.
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