论文标题
星系簇的质量积聚率：CIRS和HECS
Mass accretion rates of clusters of galaxies: CIRS and HeCS
论文作者
论文摘要
我们使用对N体模拟测试的新球形积聚食谱来测量Sloan Digital Sky Survey（CIRS）和HectoSpec集群调查（HECS）中观察到的质量增生率（MAR）为129个簇的质量增生率（MAR）。观察到的簇覆盖了$ 0.01 <z <0.30 $的红移范围，质量范围为$ \ sim 10^{14} -10^{15} {h^{ - 1}〜\ rm {m_ \ odot}} $。基于模拟群集的三维质量概况，我们的食谱返回了与基于合并树的火星一致的火星。我们采用此食谱来根据质量概况的测量值估算真实群集的MAR，将$ \ sim 3R_ {200} $估算。我们使用苛性方法来测量这些大半径的质量谱。我们通过将相同的方法应用于一组模拟红移调查，以证明估计值的有效性，该样本的中位质量为$ M_ {200} = 10^{14} {14} {h^{ - 1} { - 1}〜\ rm {m _ {m _ {m _ {\ odot}} a master，以及50个模拟的clluse clluse use and sim sim sim clluse clluse clluse clluse clluse clluse clluse clluse us sim sim clluse clluses $ m_ {200} = 10^{15} {h^{ - 1}〜\ rm {m _ {\ odot}}}} $：基于模拟群集的苛性群体概况的中位火星是公正的，并同意基于MEMIAN MARS MARS MARS MARS MARS MARS MARS MARS MARS MARS CLESTERS CLLUSESTER的$ 19 \％。 CIRS和HECS簇的MAR随着积聚簇的质量和红移而增加，这与$λ$ CDM模型中簇的增长非常吻合。
We use a new spherical accretion recipe tested on N-body simulations to measure the observed mass accretion rate (MAR) of 129 clusters in the Cluster Infall Regions in the Sloan Digital Sky Survey (CIRS) and in the Hectospec Cluster Survey (HeCS). The observed clusters cover the redshift range of $0.01<z<0.30$ and the mass range of $\sim 10^{14}-10^{15} {h^{-1}~\rm{M_\odot}}$. Based on three-dimensional mass profiles of simulated clusters reaching beyond the virial radius, our recipe returns MARs that agree with MARs based on merger trees. We adopt this recipe to estimate the MAR of real clusters based on measurements of the mass profile out to $\sim 3R_{200}$. We use the caustic method to measure the mass profiles to these large radii. We demonstrate the validity of our estimates by applying the same approach to a set of mock redshift surveys of a sample of 2000 simulated clusters with a median mass of $M_{200}= 10^{14} {h^{-1}~\rm{M_{\odot}}}$ as well as a sample of 50 simulated clusters with a median mass of $M_{200}= 10^{15} {h^{-1}~\rm{M_{\odot}}}$: the median MARs based on the caustic mass profiles of the simulated clusters are unbiased and agree within $19\%$ with the median MARs based on the real mass profile of the clusters. The MAR of the CIRS and HeCS clusters increases with the mass and the redshift of the accreting cluster, which is in excellent agreement with the growth of clusters in the $Λ$CDM model.
