论文标题
三百个项目：卫星，插入和后挡板星系的形状和径向对齐
The Three Hundred project: shapes and radial alignment of satellite, infalling, and backsplash galaxies
论文作者
论文摘要
使用324个以数字建模的星系簇，我们研究了暗物质亚隆和卫星星系的径向和星系 - 哈洛对齐，它们内部和周围环绕着。我们发现径向比对取决于到达星系群的距离，但似乎与中央宿主群的动力学状态无关。此外，我们找不到与光环形状的径向比对之间的关系。我们报告说，后挡板星系，即已经通过群集半径但现在位于郊区的对象显示出比插入物体更强的径向对齐。我们进一步发现，存在非常接近中央集群中心的径向排列良好的对准物体，这些物体被发现在高度径向轨道上。
Using 324 numerically modelled galaxy clusters we investigate the radial and galaxy-halo alignment of dark matter subhaloes and satellite galaxies orbiting within and around them. We find that radial alignment depends on distance to the centre of the galaxy cluster but appears independent of the dynamical state of the central host cluster. Furthermore, we cannot find a relation between radial alignment of the halo or galaxy shape with its own mass. We report that backsplash galaxies, i.e. objects that have already passed through the cluster radius but are now located in the outskirts, show a stronger radial alignment than infalling objects. We further find that there exists a population of well radially aligned objects passing very close to the central cluster's centre which were found to be on highly radial orbit.
