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Puzzling outer-density profile of the dark matter halo in the Andromeda galaxy

机译:仙女座星系中暗物质晕的令人困惑的外密度分布

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The cold dark matter (CDM) cosmology, which is the standard theory of the structure formation in the universe, predicts that the outer density profile of dark matter halos decreases with the cube of distance from the center. However, so far not much effort has been expended in examining this hypothesis. In the halo of the Andromeda galaxy (M 31), large-scale stellar structures detected by the recent observations provide a potentially suitable window to investigate the mass-density distribution of the dark matter halo. We explore the density structure of the dark matter halo in M 31 using an N-body simulation of the interaction between an accreting satellite galaxy and M 31. To reproduce the Andromeda Giant Southern Stream and the stellar shells at the east and west sides of M 31, we find the sufficient condition for the power-law index alpha of the outer density distribution of the dark matter halo. The best-fitting parameter is alpha=-3.7, which is steeper than the CDM prediction.
机译:冷暗物质(CDM)宇宙学是宇宙结构形成的标准理论,它预测暗物质光晕的外部密度分布随距中心距离的立方而减小。但是,到目前为止,在检验该假设上没有花费太多的努力。在仙女座星系(M 31)的晕圈中,最近观测到的大规模恒星结构为研究暗物质晕圈的质量密度分布提供了潜在的合适窗口。我们使用N体模拟积聚的卫星星系与M 31之间的相互作用来探索M 31中暗物质晕的密度结构。要重现仙女座大南流和M东西两侧的恒星壳由图31可以看出,暗物质晕圈的外部密度分布的幂律指数α的充分条件。最佳拟合参数为alpha = -3.7,比CDM预测要陡峭。

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