GeV Gamma-ray Counterparts of New Candidate Radio Supernova Remnants Reported in the GLEAM Survey

Abstract

Recently the Galactic and Extra-galactic All-sky Murchison Widefield Array survey has published 27 new candidate radio supernova remnants (SNRs) which are located within the longitude ranges of 345{\deg} < l < 60{\deg} and 180{\deg} < l < 240{\deg}. To search for the gamma-ray counterparts of these candidate radio SNRs, we analyzed 14 years of {\it Fermi}-LAT data in the energy range of 1 - 300 GeV. There are three promising SNRs; G18.9$-$1.2, G23.1$+$0.1, and G28.3$+$0.2, which we detected at a significance level of $\sim$9$\sigma$, $\sim$13$\sigma$, and $\sim$12$\sigma$, respectively. Here we report the results of our morphological and spectral analyses of G18.9$-$1.2, G23.1$+$0.1, and G28.3$+$0.2. No extended gamma-ray emission is detected for any of these SNRs. Our analysis of the 3 SNRs' {\it Fermi}-LAT gamma-ray emission showed that their best-fit positions (if assumed point-like) overlap with the locations of the corresponding GLEAM counterparts.