arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.08757astro-ph.HE
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Gamma-ray发射显示在SNR的西部边缘G344。7 -0.1

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

J. Eagle, S. Marchesi, M. Ajello, D. Castro, A. Vendrasco

摘要:

我们报告了最近使用费米伽马射线空间望远镜上的大面积望远镜(LAT)发现的一个非常高能量(VHE)的银河伽马射线源的调查。这个天体2FHL J1703.4-4145在2FHL星表中显示出一个非常硬的> 50 GeV的光谱,光子指数约为1.2,因此是2FHL子样本中最极端的来源之一。对现有多波长数据的详细分析表明,该源位于超新星遗迹(SNR)G344.7- 0.1的西边缘,以及扩展的TeV源HESS J1702-420。观测和光谱能量分布模型支持这样一种情况,即该伽马射线源是SNR冲击和周围致密介质之间相互作用的副产品,逃逸的宇宙射线(CR)扩散到致密环境中并与大型本地云相互作用,产生观测到的TeV发射。如果得到证实,SNR CR和附近的云之间的相互作用将使2FHL J1703.4-4145成为另一个有希望的2FHL银河系样本有效粒子加速的候选者,继我们之前对船帆座SNR西边缘可能发生的激波-云相互作用进行调查的第一个候选者之后。

英文摘要:

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.

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