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arXiv 0909.4679astro-ph.CO
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Abell 2028中action的逆铁偏置

The inverse iron-bias in action in Abell 2028

Fabio Gastaldello, Stefano Ettori, Italo Balestra, Fabrizio Brighenti, David Buote, Sabrina De Grandi, Myriam Gitti, Paolo Tozzi

摘要:

最近的工作的基础上的ICM属性的全球测量发现的证据增加的铁丰度的星系团与温度约2-4千电子伏。我们已经进行了研究的金属分布在附近的集群在这个温度范围内,旨在解决空间的ICM的金属含量。XMM对样本中的第一个天体Abell 2028星系团的观测揭示了该星系团在~ 300 kpc尺度上的复杂结构,显示了两个子星系团之间在"彗星“配置中的相互作用。我们发现,一个天真的一个组件适合核心的阿贝尔2028返回一个有偏见的高金属丰度。这是由于逆铁偏置,其与光谱中Fe-L和Fe-K发射线两者的存在无关,而是与拟合代码在成形一个温度分量的Fe-L络合物以调整到投影光谱的多温度结构中的行为有关。

英文摘要:

Recent work based on a global measurement of the ICM properties find evidence for an increase of the iron abundance in galaxy clusters with temperature around 2-4 keV. We have undertaken a study of the metal distribution in nearby clusters in this temperature range, aiming at resolving spatially the metal content of the ICM. The XMM observation of the first object of the sample, the cluster Abell 2028, reveals a complex structure of the cluster over scale of ~ 300 kpc, showing an interaction between two sub-clusters in a ``cometary'' configuration. We show that a naive one-component fit for the core of Abell 2028 returns a biased high metallicity. This is due to the inverse iron-bias, which is not related to the presence in the spectrum of both Fe-L and Fe-K emission lines but to the behavior of the fitting code in shaping the Fe-L complex of a one temperature component to adjust to the multi-temperature structure of the projected spectrum.

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