论文标题
弥漫性$γ$ - 射线周围的巨大恒星组成区域
Diffuse $γ$-ray emission around the massive star forming region of Carina Nebula Complex
论文作者
论文摘要
我们报告了Fermi大面积望远镜（Fermi-LAT）检测$γ$ - 射线对Carina Nebula Complex（CNC）巨大恒星形成区域的发射。使用最新的源目录和漫射背景模型，我们发现该区域的GEV $γ$ ray射击可以分为三个不同的组件。中央点源的GEV $γ$ ray排放量被认为源自ETA Carina（$η$ Car）。我们进一步发现了CNC周围的弥漫性GEV $γ$ ray发射，可以通过两个高斯磁盘对半径为0.4°（A区A）和0.75°（B区B）进行建模。来自区域A和B的GEV $γ$ ray排放均与衍生的分子气体在天空投影中具有良好的空间一致性。 A区域A的GEV $γ$ - 射线发射揭示了PION-DECAY工艺的特征光谱形状，这表明$γ$ - 砂是由Hadronic Cosmic射线与环境气体的相互作用产生的。 B区域B的$γ$ rays频谱的硬光子指数为2.12 $ \ pm $ 0.02，这与其他年轻的大型星团类似。我们认为，A区和B区域中的弥漫性GEV $γ$ ray发射可能源自簇中加速质子与环境气体的相互作用。
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.
