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.

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

References in corpus (9)

• Observations of the young supernova remnant RX J1713.7-3946 with the Fermi Large Area Telescope
• HESS VHE Gamma-Ray Sources Without Identified Counterparts
• First detection of VHE gamma-rays from SN 1006 by H.E.S.S
• Discovery of the radio and X-ray counterpart of TeV Gamma-ray source HESS J1731-347
• The neutron star in HESS J1731-347: CCOs as laboratories to study the equation of state of superdense matter
• Analysis of GeV-band gamma-ray emission from SNR RX J1713.7-3946
• XMM-Newton observations of the non-thermal supernova remnant HESS J1731-347 (G353.6-0.7)
• Modeling the shock-cloud interaction in SN 1006: unveiling the origin of nonthermal X-ray and gamma-ray emission
• A dense gas survey of the gamma-ray sources HESS J1731-347 and HESS J1729-345

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• TeV cosmic ray nuclei acceleration in shell-type supernova remnants with hard $\gamma$-ray spectra
• Detection of GeV $\gamma$-ray emission in the direction of HESS J1731-347 with Fermi-LAT
• Time evolution of broadband non-thermal emission from supernova remnants in different circumstellar environments
• Gamma-ray detection of newly discovered Ancora SNR: G288.8-6.3
• An Expanding Shell of Neutral Hydrogen Associated with SN 1006: Hints for the Single-Degenerate Origin and Faint Hadronic Gamma-Rays
• Observational constraints on the maximum energies of accelerated particles in supernova remnants: low maximum energies and a large variety
• Study on the escape timescale of high-energy particles from supernova remnants through thermal X-ray properties
• Fermi LAT detection of the supernova remnant SN 1006 revisited: the south-west limb
• Long-term evolution of non-thermal emission from Type Ia and core-collapse supernova remnants in a diversified circumstellar medium
• 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
• Modeling particle acceleration and non-thermal emission in supernova remnants
• Fermi-LAT Detection of GeV Gamma-Ray Emission from The Highly Asymmetric Shell Supernova Remnant: SNR G317.3-0.2
• Radio detection of supernova remnant G310.7-5.4 with $\gamma$-ray counterpart: Abeona SNR