arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1208.2194astro-ph.CO
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用Chandra观测Abell 1835的解投影分析及与XMM-Newton的比较

Deprojected analysis of Abell 1835 observed with Chandra and compared with XMM-Newton

Chengkui Li, Shumei Jia, Yong Chen, Fei Xiang, Yusa Wang, Haihui Zhao

摘要:

利用反投影技术,我们研究了钱德拉观测到的星系团Abell 1835的X射线性质,包括温度、丰度、电子密度、气体质量分数和总质量。与不带解投影的结果比较表明,性质变化不大。与XMM-Newton的结果比较,即使修正了XMM-Newton的点扩散函数效应,由Chandra和XMM-Newton数据得到的温度分布仍然存在差异。为了研究差异的原因,我们使用光谱来交叉校准温度。结果表明,Chandra谱可以很好地与XMM-牛顿温度拟合。此外,我们推导出电子密度分布与XMM-牛顿温度的钱德拉数据和计算的投影质量,这是一致的XMM-牛顿质量和略低于弱透镜质量在r_500。因此,似乎从XMM-牛顿导出的温度可能更可靠。

英文摘要:

Using a deprojection technique, we study the X-ray properties of the galaxy cluster Abell 1835 observed with Chandra, including temperature, abundance, electron density, gas mass fraction, and total mass. A comparison with the results without deprojection shows that the properties do not change much. When we compare the results with those of XMM-Newton, the difference between the temperature profiles derived from Chandra and XMM-Newton data still exists, even if the point-spread function effect of XMM-Newton is corrected. To investigate the reasons for the difference, we used the spectra to cross-calibrate the temperatures. They show that the Chandra spectra can be fitted well with XMM-Newton temperatures. Furthermore, we derive the electron density profile from Chandra data with XMM-Newton temperatures and calculate the projected mass, which is consistent with the XMM-Newton mass and a little lower than the weak lensing mass at r_500. Thus, it seems that the temperature derived from XMM-Newton may be more reliable.

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