论文标题
星系组和簇中最亮的星系星系和簇内光之间的过渡区域
The Transition Region between Brightest Cluster Galaxies and Intra-Cluster Light in Galaxy Groups and Clusters
论文作者
论文摘要
我们利用了银河系形成的最先进的半分析模型，以及\ citet {contini21a}中提出的模型，以研究最亮星系星（BCGS）的质量分布（BCGS）和群集内光（ICL），通过解决两个点：（1）bcg统治的分布和ICL统治和iCl统治和iCL统治和; （2）单独使用BCG+ICL质量与ICL的总质量之间的关系。我们发现过渡半径与BCG+ICL和光晕质量无关，平均为60美元$ \ pm $ 40 kpc，与以前的观察值测量非常吻合，但鉴于较大的散射，可以将其视为仅在集群量表上两种组件之间的一种物理分离。根据$ M_ {ICL} -M_ {BCG+ICL} $关系的分析，我们构建了一种能够直接从BCG+ICL One的知识中提取ICL质量的方法。鉴于低质量系统上的散布较大，这种方法在/过度预测ICL的真实价值中以很大的方式，在最坏情况下达到三倍。另一方面，对于$ \ log m_ {bcg+icl}> 12 $或$ \ log m_ {halo}> 14 $，真实值与从$ m_ {iCl} -mm_ {bcg+icl iCl} $之间的关系范围$ \ pm pm $ \ pm $ 30之间提取的差异。因此，我们将这种关系作为旨在将ICL与BCG隔离的可靠测试，用于群集量表上的Haloes托管的系统。
We take advantage of a state-of-art semi analytic model of galaxy formation, and the model presented in \citet{contini21a}, to investigate the mass distribution of Brightest Cluster Galaxies (BCGs) and Intra-Cluster Light (ICL) by addressing two points: (1) the region of transition between a BCG dominated distribution and an ICL dominated one, and; (2) the relation between the total BCG+ICL mass and the ICL one alone. We find the transition radius to be independent of both BCG+ICL and halo masses, with an average of 60$\pm$40 kpc, in good agreement with previous observational measurements, but given the large scatter, it can be considered as a sort of physical separation between the two components only on cluster scale. From the analysis of $M_{ICL}-M_{BCG+ICL}$ relation, we build a method able to extract the ICL mass directly from the knowledge of the BCG+ICL one. Given the large scatter on low mass systems, such method under/overpredicts the true value of the ICL in a significant way, up to a factor of three in the worst cases. On the other hand, for $\log M_{BCG+ICL}>12$ or $\log M_{Halo}>14$, the difference between the true value and the one extracted from the $M_{ICL}-M_{BCG+ICL}$ relation ranges between $\pm$30\%. We therefore suggest this relation as a reliable test for observational works aiming to isolate the ICL from the BCG, for systems hosted by haloes on cluster scale.
