The Disruption of the Sagittarius Dwarf Galaxy.
The Disruption of the Sagittarius Dwarf Galaxy.
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DOI：
10.1086/176247
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发表时间：
1995-02
期刊：
影响因子：
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通讯作者：
K. Johnston;D. Spergel;L. Hernquist
中科院分区：
文献类型：
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作者：
K. Johnston;D. Spergel;L. Hernquist
描述了矮椭球星系与银河系多次近距离接触的数值模拟。通过将我们的模型与最近发现的人马座矮星系（Sgr）观测到的特性进行比较，我们讨论了我们的结果对银河系形成和演化的影响。我们发现现有的观测不足以让我们对矮星的轨道或初始状态进行精确的限制。人马座星系正在进行的潮汐剥离产生的碎片预计将在银河系的光晕中形成移动的星团，而此类恒星的发现将强烈限制矮星的历史和动力学状态。此外，如果人马座目前正在受到干扰，我们预测其残骸将作为光晕中的移动团被检测到超过 1 吉里。因此，如果类似的吸积事件在银河系最近的历史中发生过，那么它们的后果仍然可以观察到。
Numerical simulations of dwarf spheroidal galaxies undergoing several close encounters with the Milky Way are described. By comparing our models to observed properties of the recently discovered dwarf galaxy in Sagittarius (Sgr), we discuss implications of our results for the formation and evolution of the Milky Way system. We find that existing observations are not sufficient to allow us to place precise limits on either the orbit or the initial state of the dwarf. Debris from the ongoing tidal stripping of the Sagittarius galaxy are expected to form moving groups in the halo of the Galaxy and the discovery of such stars would strongly constrain the history and dynamical state of the dwarf. Furthermore, if Sgr is presently being disrupted, we predict that its remains will be detectable as a moving group in the halo for more than 1 Gyr. Thus, if similar accretion events have occurred in the recent history of the Galaxy, their aftereffects may still be observable.