The Impact of Galaxy Formation on the X-ray Evolution of Clusters
The Impact of Galaxy Formation on the X-ray Evolution of Clusters
复制标题
星系形成对星团 X 射线演化的影响
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
C. Frenk
中科院分区：
文献类型：
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作者：
R. Bower;Andrew J Benson;C. Lacey;C. Baugh;S. Cole;C. Frenk
我们提出了一个新的星系团内介质的x射线特性模型，该模型明确地包括了星系团星系演化过程中释放的能量对气体的加热。我们通过将Cole等人的星系形成的半解析模型与星团内气体径向分布的简单模型相结合来计算星团的演化。我们重点研究了星团x射线的光度函数以及x射线温度与光度的关系（T-L关系）。已知对这些性质的观察与基于忽略气体冷却和加热过程的标度关系的预测不一致。我们表明，冷却本身不足以解释观测到的T-L关系的平坦性，也不足以解释观测到的x射线光度函数中缺乏强红移演化。另一方面是燃气供暖
We present a new model for the X-ray properties of the intracluster medium that explicitly includes heating of the gas by the energy released during the evolution of cluster galaxies. We calculate the evolution of clusters by combining the semi-analytic model of galaxy formation of Cole et al. with a simple model for the radial profile of the intracluster gas. We focus on the cluster X-ray luminosity function and on the relation between X-ray temperature and luminosity (the T-L relation). Observations of these properties are known to disagree with predictions based on scaling relations which neglect gas cooling and heating processes. We show that cooling alone is not enough to account for the flatness of the observed T-L relation or for the lack of strong redshift evolution in the observed X-ray luminosity function. Gas heating, on the other