FULLY COMPRESSIVE TIDES IN GALAXY MERGERS

FULLY COMPRESSIVE TIDES IN GALAXY MERGERS
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星系合并中的全压缩潮汐

DOI:
10.1088/0004-637x/706/1/67
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发表时间:
2009
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Renaud
Renaud
中科院分区:
--
文献类型:
--
作者:
Renaud

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银河系潮汐的破坏效应是引力动力学的教科书例子。然而,根据势能的形状,潮汐也可以变得完全压缩。在这种情况下,它们可能会触发或加强星系亚结构(星团和潮汐矮星系)的形成,而不是摧毁它们。我们对相互作用的星系进行N体模拟,以量化这种影响。我们证明了潮汐压缩在星系合并过程中反复发生,与具体的参数选择无关。通过为天线星系量身定做的模型,我们发现压缩潮汐的分布与观测到的子结构的位置和时间尺度相匹配。在将我们的研究扩展到广泛的参数范围后,我们得出结论,压缩潮汐的重要性(≈占恒星质量的15%)和它们的持续时间(∼10 7年)都不会强烈地受到前身体构型和轨道变化的影响。此外,我们还表明,在模拟过程中,单个物质团块可以多次进入压缩区域。我们推测,这可能会在一些星团中产生多个恒星形成事件,例如通过增强气体滞留。
The disruptive effect of galactic tides is a textbook example of gravitational dynamics. However, depending on the shape of the potential, tides can also become fully compressive. When that is the case, they might trigger or strengthen the formation of galactic substructures (star clusters and tidal dwarf galaxies), instead of destroying them. We perform N-body simulations of interacting galaxies to quantify this effect. We demonstrate that tidal compression occurs repeatedly during a galaxy merger, independently of the specific choice of parameterization. With a model tailored to the Antennae galaxies, we show that the distribution of compressive tides matches the locations and timescales of observed substructures. After extending our study to a broad range of parameters, we conclude that neither the importance of the compressive tides (≈ 15% of the stellar mass) nor their duration (∼ 10 7 yr) is strongly affected by changes in the progenitors' configurations and orbits. Moreover, we show that individual clumps of matter can enter compressive regions several times in the course of a simulation. We speculate that this may spawn multiple star formation episodes in some star clusters, through, eg, enhanced gas retention.
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影响因子: 4.8
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