高能电子布居数对星系群和星系团中金属丰度估算的影响
On the influence of high energy electron populations on metal abundance estimates in galaxy groups and clusters
摘要：
谱线发射率通常是按麦克斯韦电子分布计算的。但是，许多关于星系群和星系团以及日冕的理论工作都建议考虑修改麦克斯韦电子分布函数，以适应观测到的X射线光谱。在这里，我们研究的影响，高能量的电子种群测量的金属丰度。Prokhorov等人（2009）在论文中提出的一种通用方法用于计算修正麦克斯韦分布的线发射率。我们研究金属丰度的星系群和星系团的硬X射线过量发射观察。我们发现，修改麦克斯韦分布的氩丰度减少HCG 62组，铁丰度减少半人马座集群和氧丰度减少太阳日冕相对于麦克斯韦分布的情况下。因此，金属丰度测量是一个有前途的工具，以测试高能电子种群的存在。
英文摘要：
Spectral line emissivities have usually been calculated for a Maxwellian electron distribution. But many theoretical works on galaxy groups and clusters and on the solar corona suggest to consider modified Maxwellian electron distribution functions to fit observed X-ray spectra. Here we examine the influence of high energy electron populations on measurements of metal abundances. A generalized approach which was proposed in the paper by Prokhorov et al. (2009) is used to calculate the line emissivities for a modified Maxwellian distribution. We study metal abundances in galaxy groups and clusters where hard X-ray excess emission was observed. We found that for modified Maxwellian distributions the argon abundance decreases for the HCG 62 group, the iron abundance decreases for the Centaurus cluster and the oxygen abundance decreases for the solar corona with respect to the case of a Maxwellian distribution. Therefore, metal abundance measurements are a promising tool to test the presence of high energy electron populations.
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