标题： 发现 SNR G344.7-0.1 西部边缘的伽马射线辐射 显示英文标题

标题： Gamma-ray emission revealed at the western edge of SNR G344.7-0.1

摘要： 我们报告了对一个高能量银河系伽马射线源的调查，该源最近使用费米伽马射线空间望远镜上的大面积望远镜（LAT）在>50 GeV处被发现。 这个名为2FHL J1703.4-4145的天体，在2FHL目录中显示了一个非常硬的>50 GeV能谱，光子指数约为1.2，因此它是2FHL子样本中银河系天体中最极端的源之一。 对可用的多波段数据的详细分析表明，这个源位于超新星遗迹（SNR）G344.7--0.1的西缘，伴随有一个扩展的TeV源，HESS J1702-420。 观测和能谱能量分布建模支持这样一种情景：这个伽马射线源是超新星遗迹冲击波与密集周围介质相互作用的副产品，逃逸的宇宙射线（CRs）扩散到密集环境中，并与一个大的局部云相互作用，产生观测到的TeV发射。 如果得到证实，超新星遗迹宇宙射线与附近云之间的相互作用将使2FHL J1703.4-4145成为2FHL银河系样本中高效粒子加速的另一个有希望的候选者，紧随我们之前对维拉超新星遗迹西缘可能发生的冲击-云相互作用的调查后的一个候选者。 显示英文摘要

摘要： We report on the investigation of a very high energy (VHE), Galactic gamma-ray source recently discovered at >50GeV using the Large Area Telescope (LAT) on board the Fermi Gamma-Ray Space Telescope. This object, 2FHL J1703.4-4145, displays a very hard >50GeV spectrum with a photon index ~1.2 in the 2FHL catalog and, as such, is one of the most extreme sources in the 2FHL sub-sample of Galactic objects. A detailed analysis of the available multi-wavelength data shows that this source is located on the western edge of the supernova remnant (SNR) G344.7--0.1, along with extended TeV source, HESS J1702-420. The observations and the spectral energy distribution modeling support a scenario where this gamma-ray source is the byproduct of the interaction between the SNR shock and the dense surrounding medium, with escaping cosmic rays (CRs) diffusing into the dense environment and interacting with a large local cloud, generating the observed TeV emission. If confirmed, an interaction between the SNR CRs and a nearby cloud would make 2FHL J1703.4-4145 another promising candidate for efficient particle acceleration of the 2FHL Galactic sample, following the first candidate from our previous investigation of a likely shock-cloud interaction occurring on the West edge of the Vela SNR.