arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2210.01352astro-ph.HE
收藏

船底座星云复合体大质量恒星形成区周围的弥散$γ$射线辐射

Diffuse $γ$-ray emission around the massive star forming region of Carina Nebula Complex

Ting-Ting Ge, Xiao-Na Sun, Rui-Zhi Yang, Yun-Feng Liang, En-Wei Liang

摘要:

报道了费米大天区望远镜(Fermi-LAT)对船底座星云复合体(CNC)大质量恒星形成区的$γ$射线辐射的探测。使用最新的源目录和扩散背景模型,我们发现,在这个地区的GeV $γ$射线发射可以分解成三个不同的组件。从中心点源发射的GeV $γ$射线被认为是起源于船底座η星($η$ Car)。我们进一步发现CNC周围的扩散GeV $γ$射线发射可以用两个半径分别为0.4°(区域A)和0.75°(区域B)的高斯盘来模拟。从A区和B区得到的GeV $γ$射线辐射与导出的分子气体在天空中的投影有很好的空间一致性。A区的GeV $γ$射线辐射揭示了π介子衰变过程的特征谱形,这表明$γ$射线是由强子宇宙射线与周围气体相互作用产生的。B区的$γ$射线谱的硬光子指数为2.12 $\pm$ 0.02,与其它年轻大质量星团的硬光子指数相似。我们认为,扩散的GeV $γ$ -射线发射在区域A和区域B可能起源于加速质子与周围气体的相互作用的集群。

英文摘要:

We report the Fermi Large Area Telescope (Fermi-LAT) detection of the $γ$-ray emission toward the massive star forming region of Carina Nebula Complex (CNC). Using the latest source catalog and diffuse background models, we found that the GeV $γ$-ray emission in this region can be resolved into three different components. The GeV $γ$-ray emission from the central point source is considered to originate from the Eta Carina ($η$ Car). We further found the diffuse GeV $γ$-ray emission around the CNC which can be modelled by two Gaussian disks with radii of 0.4°(region A) and 0.75°(region B), respectively. The GeV $γ$-ray emission from both the regions A and B have good spatial consistency with the derived molecular gas in projection on the sky. The GeV $γ$-ray emission of region A reveals a characteristic spectral shape of the pion-decay process, which indicates that the $γ$-rays are produced by the interactions of hadronic cosmic rays with ambient gas. The $γ$-rays spectrum of region B has a hard photon index of 2.12 $\pm$ 0.02, which is similar to other young massive star clusters. We argue that the diffuse GeV $γ$-ray emission in region A and region B likely originate from the interaction of accelerated protons in clusters with the ambient gas.

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。

↑