论文标题
在黑暗中，将它们绑架：黑物质subhalo中断的高分辨率模拟
And In The Darkness Unbind Them: High-Resolution Simulations of Dark Matter Subhalo Disruption in a Milky Way-like Tidal Field
论文作者
论文摘要
我们比较了在有和没有重骨凸起和磁盘成分的外部潮汐场中单个暗物质subhalos的高分辨率模拟的结果，其中平均暗物质粒子质量比银河形成的宇宙学变焦模拟小三个数量级。 VIA LACTEA II模拟用于设置我们的初始条件，并为我们在仅暗物质潮汐场中对Subhalos的模拟提供了基础，而观察动机的银河系模型用于潮汐场，该模型由暗物质晕，由暗物质晕，一个出色的磁盘和恒星凸起。我们的模拟表明，在潮汐场中包括恒星组件会导致银河系状星系中的Subhalos数量仅为$ 65 \％$的$λ$ Cold Dark Matter（$λ$ CDM）。对于带有小海洋小地方的Subhalos（R_P \ Lessim 25 $ kpc），Subhalo的丰度进一步降至$ 40 \％\％$，而幸存的Subhalos则较小，并且切向分析性的轨道分配。相反，带有较大围地方的Subhalos受到潮汐场中的恒星组成部分的影响，而外部Subhalos $ \ \％$λ$ CDM预测的总数约为75 \％$。外部苏巴洛斯的密度与$λ$ CDM的预测相当，而Subhalos具有轨道的各向同性分布。这些比率高于先前研究中的比率，包括效果重型物质，这些效应受到低分辨率引起的虚假破坏的影响。
We compare the results of high-resolution simulations of individual dark matter subhalos evolving in external tidal fields with and without baryonic bulge and disk components, where the average dark matter particle mass is three orders of magnitude smaller than cosmological zoom-in simulations of galaxy formation. The Via Lactea II simulation is used to setup our initial conditions and provides a basis for our simulations of subhalos in a dark matter-only tidal field, while an observationally motivated model for the Milky Way is used for the tidal field that is comprised of a dark matter halo, a stellar disk, and a stellar bulge. Our simulations indicate that including stellar components in the tidal field results in the number of subhalos in Milky Way-like galaxies being only $65\%$ of what is predicted by $Λ$ Cold Dark Matter ($Λ$CDM). For subhalos with small pericentres $(r_p \lesssim 25$ kpc), the subhalo abundance is reduced further to $40\%$, with the surviving subhalos being less dense and having a tangentially-anisotropic orbital distribution. Conversely, subhalos with larger pericentres are minimally affected by the inclusion of a stellar component in the tidal field, with the total number of outer subhalos $\approx 75\%$ of the $Λ$CDM prediction. The densities of outer subhalos are comparable to predictions from $Λ$CDM, with the subhalos having an isotropic distribution of orbits. These ratios are higher than those found in previous studies that include the effects baryonic matter, which are affected by spurious disruption caused by low resolution.
