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arXiv 2005.13763astro-ph.GAastro-ph.CO
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星系团和星系团中团内光的质量分布

On the Mass Distribution of the Intra-Cluster Light in Galaxy Groups and Clusters

Emanuele Contini, Qiu Sheng Gu

备注：
12 pages, 6 figures and 1 table. Accepted for publication in ApJ after some revision
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摘要：

我们利用一个半解析模型与一个国家的最先进的实现的形成的星系团内光（ICL）的质量分布的研究星系团和星系团，在不同的红移。我们假设ICL遵循不同浓度的NFW轮廓，通过关系$c_{ICL}=γc_{DM}$与暗物质相关联，其中参数$γ$被设置为再现最亮星团星系（BCG）中的恒星质量与最内部100 kpc的ICL和晕质量（$M^*_{100}-M_{500}$）之间的观测关系，在$z=0$。然后，该模型进行了测试，对几个理论和观测结果，从目前的时间到$z\sim1.5$。我们的分析表明，在BCG和ICL内的最内100 kpc的恒星质量的分数是红移，参数$γ$的增加函数，和晕质量的减少函数。与观测到的$M^*_{100}-M_{500}$相匹配所需的$γ$值是$γ=3$在$z=0$，但有迹象表明它可能是红移和晕质量的函数。这一结果表明，ICL的分布比暗物质更集中，但比以前发现的其他研究集中。我们认为，一个修改后的版本的NFW是一个很好的描述的漫射光在群体和集群的分布，这使得ICL的暗物质的可靠示踪剂，在最近的观测结果很好的协议。

英文摘要：

We take advantage of a semi-analytic model with a state-of-art implementation of the formation of the intra-cluster light (ICL) to study the mass distribution of the ICL in galaxy groups and clusters, at different redshifts. We assume the ICL to follow a NFW profile with a different concentration, linked to that of the dark matter by the relation $c_{ICL}=γc_{DM}$, where the parameter $γ$ is set to reproduce the observed relation between the stellar mass in the brightest cluster galaxy (BCG) and ICL in the innermost 100 kpc and the halo mass ($M^*_{100}-M_{500}$), at $z=0$. The model is then tested against several theoretical and observational results, from the present time to $z\sim1.5$. Our analysis shows that the fraction of stellar mass in the BCG and ICL within the innermost 100 kpc is an increasing function of redshift, parameter $γ$, and a decreasing function of the halo mass. The value of $γ$ required to match the observed $M^*_{100}-M_{500}$ is $γ=3$ at $z=0$, but there are hints that it might be a function of redshift and halo mass. This result indicates that the distribution of the ICL is more concentrated than the dark matter one, but less concentrated than previously found by other studies. We suggest that a modified version of the NFW is a good description of the distribution of the diffuse light in groups and clusters, which makes the ICL a reliable tracer of the dark matter, in good agreement with recent observational findings.

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