arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.00879astro-ph.HE
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向大质量恒星形成区W40扩散的gamma-ray辐射

Diffuse gamma-ray emission toward the massive star-forming region, W40

Xiao-Na Sun, Rui-Zhi Yang, Yun-Feng Liang, Fang-Kun Peng, Hai-Ming Zhang, Xiang-Yu Wang, Felix Aharonian

摘要:

我们报告了在年轻恒星形成区W 40探测到高能γ射线信号。利用费米大天区望远镜(Fermi-LAT)10年的Pass 8数据,我们提取了一个扩展的伽马射线过剩区域,其显著性约为18 σ。辐射具有光子指数为2.49 +/- 0.01的光谱。电离气体含量的空间相关性有利于γ射线发射的强子起源。伽马射线产生区的宇宙射线(CR)质子总能量估计为10^47尔格。然而,这可能是局部加速器(可能是大质量恒星)在整个系统寿命期间释放的宇宙射线(CR)总能量的一小部分。如果是这样的话,W 40,以及早期从天鹅座茧、韦斯特隆德1、韦斯特隆德2、NGC 3603和30 Dor C探测到的伽马射线,支持了年轻星团是有效的CR工厂的假设。这一结果的独特之处在于,伽马射线发射是第一次从星团本身而不是从周围的“茧”中探测到的。

英文摘要:

We report the detection of high-energy gamma-ray signal towards the young star-forming region, W40. Using 10-year Pass 8 data from the Fermi Large Area Telescope (Fermi-LAT), we extracted an extended gamma-ray excess region with a significance of about 18sigma. The radiation has a spectrum with a photon index of 2.49 +/- 0.01. The spatial correlation with the ionized gas content favors the hadronic origin of the gamma-ray emission. The total cosmic-ray (CR) proton energy in the gamma-ray production region is estimated to be the order of 10^47 erg. However, this could be a small fraction of the total energy released in cosmic rays (CRs) by local accelerators, presumably by massive stars, over the lifetime of the system. If so, W40, together with earlier detections of gamma-rays from Cygnus cocoon, Westerlund 1, Westerlund 2, NGC 3603, and 30 Dor C, supports the hypothesis that young star clusters are effective CR factories. The unique aspect of this result is that the gamma-ray emission is detected, for the first time, from a stellar cluster itself, rather than from the surrounding "cocoons".

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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