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arXiv 1208.5950astro-ph.CO
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星系团外围:松弛星系团的普遍熵分布?

Galaxy cluster outskirts: a universal entropy profile for relaxed clusters?

S. A. Walker, A. C. Fabian, J. S. Sanders, M. R. George

摘要:

我们适合一个通用的ICM熵配置文件的函数形式的X射线星系团郊区的结果,这是所有放松的冷核心团在红移低于0.25的目录的缩放熵配置文件。我们还研究了Lapi等人和Cavaliere等人提出的函数形式,用于郊区熵分布的行为,并发现它在0.3r200之外很好地拟合了数据。我们强调了观测结果与Burns等人的数值模拟结果之间的郊区熵分布行为的差异,并表明Nagai & Lau计算的由于气体成团而导致的熵分布平坦化不足以与观测结果相匹配,这表明气体成团不能单独对星团外围的所有熵分布平坦化负责。与朱雀发现的熵分布与ROSAT,XMM牛顿和普朗克的结果是一致的。

英文摘要:

We fit a functional form for a universal ICM entropy profile to the scaled entropy profiles of a catalogue of X-ray galaxy cluster outskirts results, which are all relaxed cool core clusters at redshift below 0.25. We also investigate the functional form suggested by Lapi et al. and Cavaliere et al. for the behaviour of the entropy profile in the outskirts and find it to fit the data well outside 0.3r200 . We highlight the discrepancy in the entropy profile behaviour in the outskirts between observations and the numerical simulations of Burns et al., and show that the entropy profile flattening due to gas clumping calculated by Nagai & Lau is insufficient to match observations, suggesting that gas clumping alone cannot be responsible for all of the entropy profile flattening in the cluster outskirts. The entropy profiles found with Suzaku are found to be consistent with ROSAT, XMM-Newton and Planck results.

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