年轻大质量星团NGC 3603区域4FGL J1115 .1-6118的形态和光谱研究
Morphological and spectral study of 4FGL J1115.1-6118 in the region of the young massive stellar cluster NGC 3603
摘要：
我们报告了一个位于致密星团NGC 3603区域的未识别伽马射线源的详细研究。这是一个恒星形成区（SFR），由一个巨大的OB星团提供动力。费米伽马射线太空望远镜上的大面积望远镜（LAT）提供了10 GeV - 1 TeV的数据，对这些数据进行了10年的专门分析，发现了一个意义为9 $σ$的点状源。源光子谱可用幂律模型描述，最佳拟合谱指数为$2.35 \pm 0.03$。此外，对0.5 - 7千电子伏波段的钱德拉深空影像的分析，可靠地排除了伽马射线的河外起源。我们还得出结论，点源的宽带谱能量分布可以很好地解释轻子和强子模型。没有发现与任何其他类型的已知伽马射线发射体相关的确凿证据，因此我们推测4FGL J1115.1-6118是一种伽马射线发射SFR。
英文摘要：
We report a detailed study of an unidentified gamma-ray source located in the region of the compact stellar cluster NGC 3603. This is a star-forming region (SFR) powered by a massive cluster of OB stars. A dedicated analysis of about 10 years of data from 10 GeV - 1 TeV, provided by the Large Area Telescope (LAT) onboard the Fermi Gamma-ray Space Telescope, yields the detection of a pointlike source at a significance of 9$σ$. The source photon spectrum can be described by a power-law model with best fit spectral index of $2.35 \pm 0.03$. In addition, the analysis of a deep Chandra image in the 0.5 - 7 keV band reliably rules out an extragalactic origin for the gamma rays. We also conclude that the broadband spectral energy distribution of the point source can be explained well with both leptonic and hadronic models. No firm evidence of association with any other classes of known gamma-ray emitters is found, therefore we speculate that 4FGL J1115.1-6118 is a gamma-ray emitting SFR.
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