A&A 366, 1047-1052 (2001)
Detection of a new, low-brightness supernova remnant possibly associated with EGRET sourcesJ. A. Combi1, G. E. Romero1, P. Benaglia1 and J. L. Jonas2
1 Instituto Argentino de Radioastronomía, C.C.5, (1894) Villa Elisa, Buenos Aires, Argentina
2 Department of Physics & Electronics, Rhodes University, Grahamstown 6140, South Africa
(Received 19 September 2000 / 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 -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 -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