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arXiv 0704.1304astro-ph
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SNR 1987 A的反向冲击

The Reverse Shock of SNR 1987A

Kevin Heng

摘要:

超新星遗迹(SNR)1987 A的反向冲击波以H-α和Ly-alpha发射,并有两种类型:表面和内部。前者是由于穿过冲击波的氢原子的直接碰撞激发,而后者是这些原子与较慢的冲击波后离子之间的电荷转移反应的结果。内部和表面发射类似于在Balmer主导的SNR中观察到的宽线和窄线分量。我总结了一个形式主义,以获得线强度和比率在这些信噪比,以及研究的过渡区超新星冲击,我包括一个附录,我详细推导出宽窄H-α发射的比例。对SNR 1987 A的反向激波发射的进一步研究将使我们能够预测它何时消失,并进一步研究内部发射的起源。

英文摘要:

The reverse shock of supernova remnant (SNR) 1987A emits in H-alpha and Ly-alpha, and comes in two flavors: surface and interior. The former is due to direct, impact excitation of hydrogen atoms crossing the shock, while the latter is the result of charge transfer reactions between these atoms and slower, post-shock ions. Interior and surface emission are analogous to the broad- and narrow-line components observed in Balmer-dominated SNRs. I summarize a formalism to derive line intensities and ratios in these SNRs, as well as a study of the transition zone in supernova shocks; I include an appendix where I derive in detail the ratio of broad to narrow H-alpha emission. Further study of the reverse shock emission from SNR 1987A will allow us to predict when it will vanish and further investigate the origins of the interior emission.

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