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arXiv 0909.2827astro-ph.HEastro-ph.GA
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超新星残余脉泽与Gamma-Ray源的关联

Correlation of Supernova Remnant Masers and Gamma-Ray Sources

John W. Hewitt, Farhad Yusef-Zadeh, Mark Wardle

摘要:

超新星遗迹与分子云的相互作用是一个潜在的令人兴奋的系统,在其中可以探测到宇宙射线加速的证据。当宇宙射线遇到附近的致密云时,中性π介子的衰变会产生显著的伽马射线辐射。在许多与伽马射线源重合的超新星遗迹中,OH(1720 MHz)脉泽的存在被用来识别与致密气体的相互作用,并提供到系统的运动学距离。在本文中,我们使用统计检验来证明,这些脉泽和一类GeV到TeV能量的伽马射线源与相互作用的残余物相吻合之间存在相关性。对于π介子衰变,γ射线光度提供了对局部宇宙射线密度的直接估计。我们发现宇宙射线密度比当地太阳值增加了一到两个数量级,与这些遗迹中的X射线诱导电离相当。推断的电离率足以解释非平衡化学在冲击后的气体,在那里观察到高柱的羟基。

英文摘要:

Supernova remnants interacting with molecular clouds are potentially exciting systems in which to detect evidence of cosmic ray acceleration. Prominent gamma-ray emission is produced via the decay of neutral pions when cosmic rays encounter the nearby dense clouds. In many of the supernova remnants coincident with gamma-ray sources, the presence of OH(1720 MHz) masers is used to identify interaction with dense gas and to provide a kinematic distance to the system. In this paper we use statistical tests to demonstrate that there is a correlation between these masers and a class of GeV- to TeV-energy gamma-ray sources coincident with interacting remnants. For pion decay, the gamma-ray luminosity provides a direct estimate of the local cosmic ray density. We find the cosmic ray density is enhanced by one to two orders of magnitude over the local solar value, comparable to X-ray-induced ionization in these remnants. The inferred ionization rates are sufficient to explain non-equilibrium chemistry in the post-shock gas, where high columns of hydroxyl are observed.

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。

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