原子氢/氦气辐射电离中的不稳定性
天体物理学
2009-10-28 v1
摘要
我们展示了在能量略高于氦单电离阈值时,对原子氢和氦气进行光电离的过程是不稳定的,若氦的摩尔数比例小于约等于二分之一。然而,在本文所考察的两种基于贪噬暗物质(DDM)模型的宇宙中强化模型情形下,仍不存在显著的增长。第一种情形假设电离与复合大致处于平衡状态。这与高光子通量率和早期强化相关,但此时加热被Compton冷却所平衡,而该过程具有很强的稳定作用。第二种情形忽略复合过程。这与低光子通量率或强化的最终阶段相关,但此时在宇宙时间尺度上增长幅度太小,尚不显著。
引用
@article{arxiv.astro-ph/9604075,
title = {An Instability in the Radiative Ionization of Atomic Hydrogen/Helium Gas},
author = {Ethan Bradford and Craig Hogan},
journal= {arXiv preprint arXiv:astro-ph/9604075},
year = {2009}
}
备注
23 pages, AASTeX. Five postscript figures included. To appear in the Astrophysical Journal. Uses the Astrobib style for BibTeX; all necessaries are included, but see http://planxty.stsci.edu:1024:/astrobib/astrobib.html for how to simplify referencing in your papers. Uses TeX conditionals to produce preprints and submitable papers from the same source. The main file to LaTeX is he2.tex