Detection of a new, low-brightness supernova remnant possibly associated with EGRET sources
Instituto Argentino de Radioastronomía, C.C.5, (1894) Villa Elisa, Buenos Aires, Argentina
2 Department of Physics & Electronics, Rhodes University, Grahamstown 6140, South Africa
Accepted: 17 November 2000
We report on the discovery of a shell-type supernova remnant in the southern sky. It is a large (∼8), low-brightness source with a nonthermal radio spectrum, which requires background filtering to isolate it from the diffuse background emission of the Galaxy. Three 3EG γ-ray sources are spatially correlated with the radio structure. We have made 21-cm line observations of the region and found that two of these sources are coincident with HI clouds. We propose that the γ-ray emission is the result of hadronic interactions between high-energy protons locally accelerated at the remnant shock front and atomic nuclei in the ambient clouds.
Key words: ISM: supernova remnants / radio continuum: ISM / radiation mechanisms: nonthermal / gamma rays: observations
© ESO, 2001