利用轨道频率识别相空间子结构
On the identification of substructure in phase-space using orbital frequencies
摘要：
我们研究卫星碎片的演变，以确定最合适的空间，以确定过去的合并事件。我们确认，在这方面，轨道频率的空间是非常有前途的。在频率空间中，可以很容易地识别单个流，并且它们的分离提供了对吸积时间的直接测量。我们能够证明，对于一些理想化的引力势，这些特征在随时间强烈演化的系统中也被保留下来。此外，这种时间演化在频率空间中的流的分布中留下印记。我们还测试了一个完全自洽的（活）N体模拟的磁盘星系和一个巨大的卫星之间的合并的轨道频率的功率。即使在这种情况下，也可以很容易地识别流，并可以准确地估计卫星的吸积时间。
英文摘要：
We study the evolution of satellite debris to establish the most suitable space to identify past merger events. We confirm that the space of orbital frequencies is very promising in this respect. In frequency space individual streams can be easily identified, and their separation provides a direct measurement of the time of accretion. We are able to show for a few idealised gravitational potentials that these features are preserved also in systems that have evolved strongly in time. Furthermore, this time evolution is imprinted in the distribution of streams in frequency space. We have also tested the power of the orbital frequencies in a fully self-consistent (live) N-body simulation of the merger between a disk galaxy and a massive satellite. Even in this case streams can be easily identified and the time of accretion of the satellite can be accurately estimated.
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