论文标题
自红移1以来，最庞大的星系簇的内部暗物质结构
Internal dark matter structure of the most massive galaxy clusters since redshift 1
论文作者
论文摘要
我们研究了宇宙中最庞大的星系簇的暗物质密度谱的演变。在一大堆宇宙学模拟套件上使用“缩放”程序，总计$ 3 \，（H^{ - 1} \，\ rm GPC）^3 $，我们研究了25个最庞大的群集，其中包括$ z \ sim 1 $的四个红移切片中的四个红移切片。最小质量为$ m_ {500}> 5.5 \ times 10^{14} $ m $ _ {\ odot} $ at $ z = 1 $。每个系统在$ r_ {500} $之内具有超过200万个粒子。一旦缩放到每个红移时的临界密度，$ r_ {500} $内的暗物质曲线与今天的$ z \ sim1 $非常相似，到今天，较低的分散体为0.15 dex，并且在径向对数的斜坡和散射和散射中的红移几乎没有进化。他们具有NFW型配置文件的典型运行能力定律及其内部结构，其内部结构下降到$ 3.8 \，h^{ - 1} $以$ z = 1 $ commove kpc comove kpc，没有迹象表明会融合到渐近斜坡上。我们的结果表明，这种类型的配置文件已经在宇宙中最高质量光环中的$ z> 1 $中，并且在合并活动中仍然非常健壮。
We investigate the evolution of the dark matter density profiles of the most massive galaxy clusters in the Universe. Using a `zoom-in' procedure on a large suite of cosmological simulations of total comoving volume of $3\,(h^{-1}\,\rm Gpc)^3$, we study the 25 most massive clusters in four redshift slices from $z\sim 1$ to the present. The minimum mass is $M_{500} > 5.5 \times 10^{14}$ M$_{\odot}$ at $z=1$. Each system has more than two million particles within $r_{500}$. Once scaled to the critical density at each redshift, the dark matter profiles within $r_{500}$ are strikingly similar from $z\sim1$ to the present day, exhibiting a low dispersion of 0.15 dex, and showing little evolution with redshift in the radial logarithmic slope and scatter. They have the running power law shape typical of the NFW-type profiles, and their inner structure, resolved to $3.8\,h^{-1}$ comoving kpc at $z=1$, shows no signs of converging to an asymptotic slope. Our results suggest that this type of profile is already in place at $z>1$ in the highest-mass haloes in the Universe, and that it remains exceptionally robust to merging activity.
