Non-Equilibrium Ionization State of a Warm-Hot Intergalactic Medium
Non-Equilibrium Ionization State of a Warm-Hot Intergalactic Medium
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DOI：
10.1093/pasj/58.4.641
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发表时间：
2006-03
影响因子：
2.3
通讯作者：
K. Yoshikawa;S. Sasaki
中科院分区：
文献类型：
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作者：
K. Yoshikawa;S. Sasaki
在没有电离平衡假设的情况下，在宇宙学的背景下考虑了宇宙重子中金属的电离态的时间演化。我们发现，在温热星际介质(WHIM)中，相当大一部分电离氧(Ovii和Oviii)在z�0时不处于电离平衡态。我们还研究了这种偏离电离平衡的结果对奇想的可探测性和可观测性的影响。结果发现，通过发射和吸收特征，奇想的可探测性没有太大变化，但O VII和O VIII之间的线比与电离平衡态的线比有很大不同。
The time evolution of the ionization state of metals in cosmic baryons is considered in a cosmological context without the assumption of ionization equilibrium. We find that a significant fraction of ionized oxygen (O VII and O VIII) in a warm–hot intergalactic medium (WHIM) is not in the ionization equilibrium state at a redshift of z � 0. We also investigate the effect on the detectability and observables of WHIM as a consequence of such a deviation from ionization equilibrium. It is found that the detectability of WHIM is not altered very much both through its emission and absorption signatures, but the line ratios between O VII and O VIII are significantly different from those in the ionization equilibrium state.