中子星瞬态AX J1745中Fe K吸收等离子体的光电离不稳定性.6-2901
Photoionization instability of the Fe K absorbing plasma in the neutron star transient AX J1745.6-2901
摘要：
AX J1745.6-2901是一颗低质量X射线双星，有一颗吸积的中子星，显示出高度电离吸收的明显证据。强电离Fe K $α$和K $β$吸收线总是观察到在软态，而它们消失在硬态。我们计算了硬态和软态的光电离稳定性曲线，在不同的假设下采用的光谱能量分布和等离子体的物理参数。我们观察到，在软态下，电离吸收体总是位于光电离稳定性曲线的稳定分支上，而在硬态下，它变得不稳定。这表明，光电离不稳定性在定义电离吸收体的可观察性质中起着关键作用。同样的过程也可以解释其他吸积中子星和黑洞在硬态时高电离吸收体/风的消失。
英文摘要：
AX J1745.6-2901 is a Low Mass X-ray Binary with an accreting neutron star, showing clear evidence for highly ionized absorption. Strong ionized Fe K$α$ and K$β$ absorption lines are always observed during the soft state, whereas they disappear during the hard states. We computed photoionization stability curves for the hard and the soft state, under different assumptions on the adopted spectral energy distributions and the physical parameters of the plasma. We observe that the ionized absorber lies always on a stable branch of the photoionization stability curve during the soft state, while it becomes unstable during the hard state. This suggests that photoionization instability plays a key role in defining the observable properties of the ionized absorber. The same process might explain the disappearance of the high ionization absorber/wind, during the hard state in other accreting neutron stars and black holes.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
