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arXiv 1704.04243astro-ph.GA
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群和团环境中的相空间分析:自入流以来的时间和潮汐质量损失

Phase-space Analysis in the Group and Cluster environment: Time since Infall and Tidal Mass Loss

Jinsu Rhee, Rory Smith, Hoseung Choi, Sukyoung K. Yi, Yara L. Jaffé, Graeme N. Candlish, Ruben Sanchez-Janssen

摘要:

使用最新的宇宙流体动力学N体模拟的群体和集群,我们研究如何在相空间坐标的位置在$z$ $=$ $0$可以提供信息的环境效应在集群中发挥作用。我们证实了以前的作者的结果表明,星系往往遵循一个典型的路径相空间,因为它们解决到集群潜力。因此,相空间的不同区域可以与自第一次落入星团以来的不同时间相关联。然而,此外,我们看到一个明显的趋势之间的总质量损失,由于集群潮汐,和时间以来的下降。因此,我们发现在相空间中的位置提供了两个信息的落入时间,和潮汐质量损失。我们发现相空间图的预测能力仍然存在,即使使用投影量(即视线速度和投影距离集群)。我们提供的数字可以直接与观察到的星系团样本进行比较,我们还提供了用于制作它们的数据作为补充数据,以鼓励使用相空间图作为理解星系团环境效应的工具。我们发现,我们的结果依赖于星系质量或主机质量非常弱,所以我们的相空间图中的预测可以适用于集团或集群一样,或从矮星到巨星星系种群。

英文摘要:

Using the latest cosmological hydrodynamic N-body simulations of groups and clusters, we study how location in phase-space coordinates at $z$$=$$0$ can provide information on environmental effects acting in clusters. We confirm the results of previous authors showing that galaxies tend to follow a typical path in phase-space as they settle into the cluster potential. As such, different regions of phase-space can be associated with different times since first infalling into the cluster. However, in addition, we see a clear trend between total mass loss due to cluster tides, and time since infall. Thus we find location in phase-space provides information on both infall time, and tidal mass loss. We find the predictive power of phase-space diagrams remains even when projected quantities are used (i.e. line-of-sight velocities, and projected distances from the cluster). We provide figures that can be directly compared with observed samples of cluster galaxies and we also provide the data used to make them as supplementary data, in order to encourage the use of phase-space diagrams as a tool to understand cluster environmental effects. We find that our results depend very weakly on galaxy mass or host mass, so the predictions in our phase-space diagrams can be applied to groups or clusters alike, or to galaxy populations from dwarfs up to giants.

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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