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Issue A&A
Volume 366, Number 3, February II 2001
Page(s) 1047 - 1052
Section Diffuse matter in space
DOI http://dx.doi.org/10.1051/0004-6361:20000286



A&A 366, 1047-1052 (2001)
DOI: 10.1051/0004-6361:20000286

Detection of a new, low-brightness supernova remnant possibly associated with EGRET sources

J. 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 )

Abstract
We report on the discovery of a shell-type supernova remnant in the southern sky. It is a large ($\sim$8 $^{\circ} \times 8^{\circ}$), 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 $\gamma$-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 $\gamma$-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

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