Detection of an Unidentified Extended Gamma-ray Source Close to the Galactic Supernova Remnant 3C 400.2

TL;DR

A new extended gamma-ray source near supernova remnant 3C 400.2 was discovered using nearly a decade of Fermi-LAT data, revealing its spatial extension and spectral properties.

Contribution

This study reports the detection and characterization of a previously unidentified gamma-ray source close to 3C 400.2, including its spatial extension and spectral behavior.

Findings

Detected a new gamma-ray source with 13σ significance.

Measured the source's extension radius as 0.61 degrees.

Found the source's spectrum follows a power-law with index ~2.38.

Abstract

A new extended gamma-ray source (PS J1934.5+1845) was detected with a significance of $\sim$13$\sigma$ at a location of 1$^{\circ}\!\!$.83 away from the radio location of the Galactic supernova remnant 3C 400.2 using about 9 years of Fermi-LAT data. The 68% containment radius of PS J1934.5+1845's extension was found to be 0$^{\circ}\!\!$.61 and PS J1934.5+1845 is showing a power-law type spectrum with a spectral index of $\sim$2.38. In this presentation we will summarize the gamma-ray analysis methods and report on the analysis results related to the extension and spectrum of PS J1934.5+1845.