标题： 下沉卫星的动力学摩擦时间尺度的建模 显示英文标题

标题： Modelling the dynamical friction timescale of sinking satellite

摘要： 当一个卫星星系落入巨大的暗物质晕时，它会受到动力学潮汐力的作用，这种力量会将其拖向晕的中心，并最终与中心星系合并。 从进入到合并之间的时间间隔被称为动力学潮汐力时间尺度（\(T_\{df\}\)）。 许多研究致力于使用解析模型或N体模拟来推导\(T_\{df\}\)。 这些研究已经得到了关于\(T_\{df\}\)如何依赖轨道参数以及卫星和宿主晕质量比的定性一致意见。 然而，在\(T_\{df\}\)的确切形式上仍存在分歧。 在本文中，我们提出了一种半解析模型来预测\(T_\{df\}\)，并专注于解释不同研究之间的差异。 我们发现，由潮汐剥离引起的卫星质量损失处理主导了\(T_\{df\}\)的行为。 我们还确定了影响预测\(T_\{df\}\)的其他模型参数。 显示英文摘要

摘要： When a satellite galaxy falls into a massive dark matter halo, it suffers the dynamical friction force which drag it into the halo center and finally it merger with the central galaxy. The time interval between entry and merger is called as the dynamical friction timescale (T_df). Many studies have been dedicated to derive T_df using analytical models or N-body simulations. These studies have obtained qualitative agreements on how T_df depends on the orbit parameters, and mass ratio between satellite and host halo. However, there are still disagreements on the accurate form of T_df . In this paper, we present a semi-analytical model to predict T_df and we focus on interpreting the discrepancies among different studies. We find that the treatment of mass loss from satellite by tidal stripping dominates the behavior of T_df . We also identify other model parameters which affect the predicted T_df.