Gev $γ$-ray emission in the direction of HESS J1731-347 [HEAP]

We report the detection of GeV $\gamma$-ray emission from supernova remnant HESS J1731-347 using 9 years of {\it Fermi} Large Area Telescope data. We find a slightly extended GeV source in the direction of HESS J1731-347. The spectrum above 1 GeV can be fitted by a power-law with an index of $\Gamma = 1.77\pm0.14$, and the GeV spectrum connects smoothly with the TeV spectrum of HESS J1731-347. Either a hadronic-leptonic or a pure leptonic model can fit the multi-wavelength spectral energy distribution of the source. However, the hard GeV $\gamma$-ray spectrum is more naturally produced in a leptonic (inverse Compton scattering) scenario, under the framework of diffusive shock acceleration. We also searched for the GeV $\gamma$-ray emission from the nearby TeV source HESS J1729-345. No significant GeV $\gamma$-ray emission is found, and upper limits are derived.

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X. Guo, Y. Xin, N. Liao, et. al.
Mon, 13 Nov 17

Comments: 6 pages, 5 figures, 3 tables. Submit to ApJ, comments are welcome