论文标题
银河系周围的大多数矮人球形星系不能是黑暗的卫星
Most dwarf spheroidal galaxies surrounding the Milky Way cannot be dark-matter dominated satellites
论文作者
论文摘要
银河系矮球星系是最小观察到的星系，目前与最大的暗物质部分有关，这是由于它们太大的速度分散体所揭示的。但是，其中大多数都在其轨道周围附近发现。这导致了非常低的概率，p = 2 $ 10^{ - 7} $，它们可能是长期寿命的卫星，例如由宇宙学模拟预测的sub-halos。他们与周围的人的距离相反，表明它们受到潮汐冲击的影响，这些冲击提供了足够的运动能量来解释其高速分散体。暗物质特性与银河系的距离的依赖性似乎有利于潮汐震惊，并从平衡的DSPH中，而不是以暗物质为主的自我平衡系统。
Milky Way dwarf spheroidal galaxies are the tiniest observed galaxies and are currently associated with the largest fractions of dark matter, which is revealed by their too large velocity dispersions. However, most of them are found near their orbital pericenters. This leads to a very low probability, P = 2 $10^{-7}$, that they could be long-lived satellites such as sub-halos predicted by cosmological simulations. Their proximity to their pericenters suggests instead that they are affected by tidal shocks, which provide sufficient kinematic energy to explain their high velocity dispersions. Dependency of the dark matter properties to their distance to the Milky Way appears to favor tidally shocked and out of equilibrium dSphs instead of self-equilibrium systems dominated by dark matter.
