Fermi-LAT Detection of GeV Gamma-Ray Emission from The Highly Asymmetric Shell Supernova Remnant: SNR G317.3-0.2

TL;DR

This study reports the first detection of extended GeV gamma-ray emission from the supernova remnant SNR G317.3-0.2 using 12.2 years of Fermi-LAT data, confirming it as a gamma-ray source associated with the remnant.

Contribution

First extended GeV gamma-ray emission detection from SNR G317.3-0.2, establishing its gamma-ray counterpart and analyzing long-term Fermi-LAT data.

Findings

Detected gamma-ray emission at 8.13σ significance

Gamma-ray source position matches radio observations

No significant variability over 12.2 years

Abstract

In this paper, we report the first extended GeV $\gamma$-ray emission, at a significant level of $\sim$ 8.13$\sigma$, from the region of the supernova remnant (SNR) SNR G317.3-0.2 by analyzing $\sim$ 12.2 years of Fermi Large Area Telescope (Fermi-LAT) Pass 8 data in the work. The best-fit position of the new $\gamma$-ray source matches that of the 843 MHz radio energy band of SNR G317.3-0.2, and there is no significant variability of the photon flux of the corresponding light curve (LC) in the data for the 12.2 year period; therefore, by excluding other known $\gamma$-ray sources or candidates within a 2$\sigma$ error radius from the best-fit position of SNR G317.3-0.2, we suggest that the $\gamma$-ray source is likely to be a GeV counterpart of SNR G317.3-0.2.