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arXiv 2406.03320astro-ph.HE
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在 Cl Danks 1 和 2 附近探测到延展的伽马射线辐射

Detection of extended gamma-ray emission in the vicinity of Cl Danks 1 and 2

Jiahao Liu, Bing Liu, Ruizhi Yang

AI总结:

本文利用 Fermi 望远镜 15 年数据在 G305 恒星形成区探测到延展伽马射线源,发现其具有 π介子凸起特征,总宇宙线质子能量达 $10^{49}\ \rm erg$,支持年轻大质量星团是宇宙线加速器的假设。

摘要:

我们报告了在 G305 恒星形成区方向探测到高能伽马射线辐射。利用 {\sl Fermi} 大面积望远镜近 15 年的观测数据,我们在此区域探测到一个显著性约为 $13 σ$ 的延展伽马射线源。该伽马射线辐射呈现出清晰的 π介子凸起特征,并且可以用指数为 $-2.5$ 的幂律母质子谱进行拟合。伽马射线产生区域内的宇宙线(CR)质子总能量估计为 $10^{49}\ \rm erg$ 量级。我们进一步根据伽马射线辐射和气体分布推导了 CR 的径向分布,发现其大致遵循 $1/r$ 型剖面,这与其他类似系统相一致,也符合该区域中心强大的年轻大质量星团 Danks 1 或 Danks 2 持续注入 CR 的预期。结合此前对类似伽马射线结构(如 Cygnus cocoon、Westerlund 1、Westerlund 2、NGC 3603 和 W40)的探测,此次探测支持了年轻大质量星团是 CR 加速器的假设。

英文摘要:

We report the detection of high-energy gamma-ray emission towards the G305 star-forming region. Using almost 15 years of observation data from {\sl Fermi} Large Area Telescope, we detected an extended gamma-ray source in this region with a significance of $\sim 13 σ$. The gamma-ray radiation reveals a clear pion-bump feature and can be fitted with the power law parent proton spectrum with an index of $-2.5$. The total cosmic ray (CR) proton energy in the gamma-ray production region is estimated to be the order of $10^{49}\ \rm erg$. We further derived the CR radial distribution from both the gamma-ray emission and gas distribution and found it roughly obeys the $1/r$ type profile, which is consistent with other similar systems and expected from the continuous injection of CRs by the central powerful young massive star cluster Danks 1 or Danks 2 in this region. Together with former detections of similar gamma-ray structures, such as Cygnus cocoon, Westerlund 1, Westerlund 2, NGC 3603, and W40, the detection supports the hypothesis that young massive star clusters are CR accelerators.

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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