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arXiv 2007.15295astro-ph.HEastro-ph.GAastro-ph.SR
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朝向银河系小型星暴W43的弥散gamma-ray发射

The diffuse gamma-ray emission toward the Galactic mini starburst W43

Rui-zhi Yang, Yuan Wang

摘要:

在本文中,我们报告费米大天区望远镜(LAT)的年轻恒星形成区W43的伽玛射线辐射的检测。使用最新的源目录和扩散背景模型,扩展的伽玛射线过剩检测到的意义约为16 $σ$。伽马射线发射具有光子指数为$2.3 \pm 0.1$的光谱。我们还进行了详细的分析,在这个区域的气体含量,考虑到不透明度校正HI气柱密度。宇宙射线(CR)质子的总能量估计为$10^{48}\ \rm erg,$的数量级,假设γ射线是由加速的质子和原子核与周围气体的相互作用产生的。通过与银河系其他恒星形成区的比较,我们发现,与恒星形成率(SFR)相比,CR光度与风力的相关性更好。这一结果表明,在这些系统中,CR主要由恒星风加速

英文摘要:

In this paper we report the Fermi Large Area Telescope (LAT) detection of the gamma-ray emission toward the young star forming region W43. Using the latest source catalog and diffuse background models, the extended gamma-ray excess is detected with a significance of about 16 $σ$. The gamma-ray emission has a spectrum with a photon index of $2.3 \pm 0.1$. We also performed a detailed analysis of the gas content in this region by taking into account the opacity correction to the HI gas column density. The total cosmic-ray (CR) proton energy is estimated to be on the order of $10^{48}\ \rm erg,$ assuming the gamma-ray are produced from the interaction of the accelerated protons and nuclei with the ambient gas. Comparing this region to the other star formation regions in our Galaxy, we find that the CR luminosity is better correlated with the wind power than the star formation rate (SFR). This result suggests that CRs are primarily accelerated by stellar wind in these systems

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