费米气泡是1015ev以上宇宙射线的来源

D.O. Chernyshov , K.S. Cheng , V.A. Dogiel , C.M. Ko
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引用次数: 4

摘要

费米气泡是一种巨大的伽玛射线结构,分布在银河系中心的南北两侧,其特征尺寸为10kpc,是费米大面积望远镜最近发现的。费米气泡所覆盖区域的射电和伽马射线发射之间的良好相关性意味着该区域存在高能电子。由于具有这种能量的相对论性电子要从银河系源头一路奔向费米泡是相对困难的,因此可以假设它们是在原地加速的。相应的加速机制也会影响星系中相对论性质子的分布。由于质子的寿命要长得多,这种效应甚至可以在地球附近观察到。在我们的模型中,我们认为费米气泡是由超大质量黑洞Sgr A*的周期性恒星吸积所产生的一系列激波中的电子加速产生的。我们提出,在观测到的CR光谱“膝部”内的强子CR是由分布在银盘上的银河超新星残余物产生的。这些粒子在费米气泡中的再加速会产生膝盖以上的cr。该模型对观测到的CR通量、光谱指数和膝关节处的光谱匹配提供了一个自然的解释。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fermi bubbles as a source of cosmic rays above 1015 eV

Fermi bubbles are giant gamma-ray structures extended north and south of the Galactic center with characteristic sizes of order of 10 kpc recently discovered by Fermi Large Area Telescope. Good correlation between radio and gamma-ray emission in the region covered by Fermi bubbles implies the presence of high-energy electrons in this region. Since it is relatively difficult for relativistic electrons of this energy to travel all the way from the Galactic sources toward Fermi bubbles one can assume that they accelerated in-situ. The corresponding acceleration mechanism should also affect the distribution of the relativistic protons in the Galaxy. Since protons have much larger lifetimes the effect may even be observed near the Earth. In our model we suggest that Fermi bubbles are created by acceleration of electrons on series of shocks born due to periodic star accretions by supermassive black hole Sgr A*. We propose that hadronic CR within the “knee” of the observed CR spectrum are produced by Galactic supernova remnants distributed in the Galactic disk. Reacceleration of these particles in the Fermi Bubble produces CRs beyond the knee. This model provides a natural explanation of the observed CR flux, spectral indexes, and matching of spectra at the knee.

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