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arXiv 1508.04494astro-ph.GA
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用Milky Way观测检验暗物质焦散理论

Testing the Dark Matter Caustic Theory Against Observations in the Milky Way

Julie Dumas, Heidi J. Newberg, Bethany Niedzielski, Adam Susser, Jeffery M. Thompson, Jake Weiss, Kim M. Lewis

摘要:

我们测试一个特定的理论暗物质,其中暗物质轴子形成环“焦散线”在银河系的平面对银河系恒星的实际观测。根据这一理论,具有角动量的冷的、无碰撞的暗物质粒子在薄片上进出银河系。这些流动在最接近银河系中心的位置形成焦散环(在环的位置,流动的密度形式上是无限的)。我们表明,焦散环暗物质理论再现了一个大致对数晕,大扰动附近的环。我们表明,该理论可以合理地匹配所观察到的银河系的旋转曲线。我们探索焦散环的影响矮星系潮汐破裂使用N体模拟。特别是,模拟人马座矮星系潮汐破裂的腐蚀性环晕潜力匹配观测的尾随潮汐尾远至90千秒差距的银河系中心,他们不,但是,匹配领先的潮汐尾。焦散环、NFW或三轴对数晕都不符合所有数据。计算焦散环光环加速度的源代码已在NEMO Stellar Dynamics和Milkyway@home客户端存储库中公开提供。

英文摘要:

We test a particular theory of dark matter in which dark matter axions form ring "caustics" in the plane of the Milky Way against actual observations of Milky Way stars. According to this theory, cold, collisionless dark matter particles with angular momentum flow in and out of the Milky Way on sheets. These flows form caustic rings (at the positions of the rings, the density of the flow is formally infinite) at the locations of closest approach to the Galactic center. We show that the caustic ring dark matter theory reproduces a roughly logarithmic halo, with large perturbations near the rings. We show that the theory can reasonably match the observed rotation curve of the Milky Way. We explore the effects of the caustic rings on dwarf galaxy tidal disruption using N-body simulations. In particular, simulations of the Sagittarius dwarf galaxy tidal disruption in a caustic ring halo potential match observations of the trailing tidal tail as far as 90 kpc from the Galactic center; they do not, however, match the leading tidal tail. None of the caustic ring, NFW, or triaxial logarithmic halos fit all of the data. The source code for calculating the acceleration due to a caustic ring halo has been made publicly available in the NEMO Stellar Dynamics Toolbox and the Milkyway@home client repository.

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