论文标题
在暗物质中创建缺乏暗物质的星系以宇宙为主
Creating a galaxy lacking dark matter in a dark matter dominated universe
论文作者
论文摘要
我们使用流体动力学宇宙学模拟，以表明可以通过潮汐相互作用来创建以暗物质为主导的宇宙中缺乏暗物质的星系。我们从Nihao项目中选择矮星系，该星系在标准的冷暗物质模型中获得，并将其用作卫星中央相互作用模拟的初始条件。在只有一个具有很强径向成分的轨道上的围遍通道之后，Nihao Dwarf星系可能会损失多达80英寸的深色物质内容，但最有趣的是，它们的中心（$ \ \ 8 $ \ kpc）的深色物质与恒星比率的变化是从$ {\ sim} 25 $的价值中，以及abrimental and abrimental and Abundy As Abrunding As Abrunding As Abrund and Abunce and Abundy As Abund， NGC1052-DF2和NGC1054-DF4。恒星速度色散从$ {\ sim} 30 $ $ {\ rm km \，s^{ - 1}} $之前，然后输入到低至$ 6 \ pm 2 $〜$〜$ {\ rm km km km km \，s^{ - 1}} $的值低至$ 6 \ pm 2 $〜$〜$〜$〜$〜$〜$〜$〜$〜$〜$〜$〜$〜$〜$。这些，半径约为3 kpc，与van Dokkum和合作者的观察非常吻合。我们的研究表明，只要它们生活在茂密的环境中，就可以从在暗物质中以典型的宇宙形成的典型矮人星系开始创建一个“无”暗物质。
We use hydrodynamical cosmological simulations to show that it is possible to create, via tidal interactions, galaxies lacking dark matter in a dark matter dominated universe. We select dwarf galaxies from the NIHAO project, obtained in the standard Cold Dark Matter model and use them as initial conditions for simulations of satellite-central interactions. After just one pericentric passage on an orbit with a strong radial component, NIHAO dwarf galaxies can lose up to 80 per~cent of their dark matter content, but, most interestingly, their central ($\approx 8$~kpc) dark matter to stellar ratio changes from a value of ${\sim}25$, as expected from numerical simulations and abundance matching techniques, to roughly unity as reported for NGC1052-DF2 and NGC1054-DF4. The stellar velocity dispersion drops from ${\sim}30$ ${\rm km\,s^{-1}}$ before infall to values as low as $6\pm 2$~ ${\rm km\,s^{-1}}$. These, and the half light radius around 3 kpc, are in good agreement with observations from van Dokkum and collaborators. Our study shows that it is possible to create a galaxy "without" dark matter starting from typical dwarf galaxies formed in a dark matter dominated universe, provided they live in a dense environment.
