NGC 147, NGC 185 and CassII: a genetic approach to orbital properties, star formation and tidal debris

NGC 147, NGC 185 and CassII: a genetic approach to orbital properties, star formation and tidal debris
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NGC 147、NGC 185 和 CassII:轨道特性、恒星形成和潮汐碎片的遗传方法

DOI:
10.1093/mnras/stv2781
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发表时间:
2015
影响因子:
4.8
通讯作者:
Arias V
Arias V
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Arias V

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NGC 147、NGC 185和仙后座II(CassII)在天空中的位置、距离和测量的视线速度都相似。相空间的这种接近性表明M31的这三颗卫星在本星系群中形成了一个子群。尽管如此,它们的星星形成历史和星际介质的差异,以及最近在NGC 147中发现的恒星流,再加上其他两颗卫星缺乏潮汐特征,都表明M31与这三颗卫星之间存在复杂而多样的相互作用。我们使用遗传算法来探索不同的轨道,这些卫星可以有,并选择六组轨道,可以最好地解释NGC 147,NGC 185和CassII卫星的观测功能。这些轨道的参数,然后作为一个起点forN体模拟。我们提出的模型,其中NGC 147,NGC 185和CassII是一个绑定组的总时间至少为1 Gyr,但仍然经历不同的相互作用与M31,因此NGC 147有一个明确的恒星流,而其他两个卫星没有显着的潮汐功能。这一结果表明,有可能找到重现卫星对比性质的解决方案,并且NGC 147-NGC 185-CassII已经被引力束缚。
NGC 147, NGC 185 and Cassiopeia II (CassII) have similar positions in the sky, distances and measured line-of-sight velocities. This proximity in phase space suggests that these three satellites of M31 form a subgroup within the Local Group. Nevertheless, the differences in their star formation history and interstellar medium, and the recent discovery of a stellar stream in NGC 147, combined with the lack of tidal features in the other two satellites, are all indications of complex and diverse interactions between M31 and these three satellites. We use a genetic algorithm to explore the different orbits that these satellites can have and select six sets of orbits that could best explain the observational features of the NGC 147, NGC 185 and CassII satellites. The parameters of these orbits are then used as a starting point forN-body simulations. We present models for which NGC 147, NGC 185 and CassII are a bound group for a total time of at least 1 Gyr but still undergo different interactions with M31 and as a result NGC 147 has a clear stellar stream, whereas the other two satellites have no significant tidal features. This result shows that it is possible to find solutions that reproduce the contrasting properties of the satellites and for which NGC 147-NGC 185-CassII have been gravitationally bound.
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发表时间: 2012
影响因子: 4.8
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发表时间: 2012
影响因子: 4.8
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发表时间: 2013-10
影响因子: 6.5
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M. Bellazzini;T. Oosterloo;F. Fraternali;G. B. INAF-OABo;Astron;Dwingeloo;K. Inst.;Groningen;DIFA- Bologna Univ.;ESO-Chile
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矮椭圆星系 NGC 147 中的恒星群
DOI: --
发表时间: 1993
期刊:
影响因子: --
作者:
M. Lee;W. Freedman;B. Madore
通讯作者: B. Madore