Analytical Approach to the Mass Distribution Function of Subhalos and Cold Fronts in Galaxy Clusters
Analytical Approach to the Mass Distribution Function of Subhalos and Cold Fronts in Galaxy Clusters
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星系团中次晕和冷锋质量分布函数的解析方法
DOI：
10.1086/342148
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
T. Yano
中科院分区：
文献类型：
--
作者：
Y. Fujita;C. Sarazin;M. Nagashima;T. Yano
在冷暗物质理论的背景下，建立了星系团中亚晕质量分布函数的解析模型。我们的模型考虑了两个重要的影响：集群前区域的高密度和初始密度波动的空间相关性。对于小质量的亚晕，我们的模型预测的MDF介于Press-Schechter (PS) MDF和作为PS形式主义扩展的条件MDF之间。我们将模型的结果与数值模拟结果进行了比较。我们发现我们的模型预测与数值模拟得到的星系团中亚晕的质量和速度分布函数是一致的。我们估计发现经常有“冷锋”的大型x射线亚晕的概率。观测到的大x射线亚晕和冷锋可能并不总是星团合并的结果，而可能是星团的内部结构。
We construct an analytical model of the mass distribution function (MDF) of subhalos in a galaxy cluster in the context of the cold dark matter theory. Our model takes account of two important effects: the high density of the precluster region and the spatial correlation of initial density fluctuations. For subhalos with small masses, the MDF that our model predicts is in between the Press-Schechter (PS) MDF and a conditional MDF as an extension of the PS formalism. We compare the results of our model with those of numerical simulations. We find that our model predictions are consistent with the mass and velocity distribution functions of subhalos in a cluster obtained by numerical simulations. We estimate the probability of finding large X-ray subhalos that often have "cold fronts." The observed large X-ray subhalos and cold fronts may not always be the result of cluster mergers but may instead be internal structures in clusters.