Detection of two TeV shell-type remnants at GeV energies with Fermi-LAT: HESS J1731-347 and SN 1006

Abstract

We report the first high-significance GeV gamma-ray detections of supernova remnants HESS J1731-347 and SN 1006, both of which have been previously detected by imaging atmospheric Cherenkov Telescopes above 1 TeV. Using 8 years of Fermi Pass 8 data at energies between 1 GeV and 2 TeV, we detect emission at the position of HESS J1731-347 with a significance of $\sim 5\sigma$ and a spectral index of $\Gamma =1.66\pm 0.16_{\mathrm{stat}}\pm 0.12_{\mathrm{syst}}$. The hardness of the index and the good connection with the TeV spectrum of HESS J1731-347 support an association between the two sources. We also confirm the detection of SN 1006 at $\sim 6\sigma$ with a spectral index of $\Gamma =1.79\pm 0.17_{\mathrm{stat}}\pm 0.27_{\mathrm{syst}}$. The northeast (NE) and southwest (SW) limbs of SN 1006 were also fit separately, resulting in the detection of the NE region ($\Gamma =1.47\pm 0.26_{\mathrm{stat}}$) and the non-detection of the SW region. The significance of different spectral components for the two limbs is $3.6\sigma$, providing first indications of an asymmetry in the GeV $\gamma$-ray emission.

arXiv comment7 pages, 3 figures, 1 table. Accepted for publication in ApJ

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• Is the SNR HESS J1731-347 colliding with molecular clouds?
• Numerically investigating the morphology of the supernova remnant SN 1006 in the ambient medium with a density discontinuity
• Hadronic particle acceleration in the supernova remnant SN 1006 as traced by Fermi-LAT observations
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