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Astron. Astrophys. 333, L91-L94 (1998)

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Letter to the Editor

The [FORMULA] -ray source 2EGS J1703-6302: a new supernova remnant in interaction with an HI cloud?

J.A. Combi 1, 2, G.E. Romero * 1, 2, 3 and P. Benaglia 1, 3

1 Instituto Argentino de Radioastronomía, C.C.5, (1894) Villa Elisa, Bs. As., Argentina
2 Departamento de Física, Universidad Nacional de La Plata, C.C. 67, (1900) La Plata, Argentina
3 Instituto Astronômico e Geofísico, Universidade de São Paulo, Av. M. Stefano 4200, CEP 04301-904 São Paulo, SP, Brazil

Received 15 January 1998 / Accepted 3 March 1998


We present observational evidence supporting a picture where the [FORMULA] -ray source 2EGS J1703-6302 is the result of the interaction between cosmic rays (CRs) accelerated in a supernova remnant (SNR) and a nearby HI cloud. The SNR has been disclosed by filtering the diffuse disk emission from new 1.42 GHz continuum observations of the radio field around 2EGS J1703-6302. The cloud was detected through neutral hydrogen line observations of the same area of the sky. The CR enhancement in the SNR with respect to the local value is about a factor [FORMULA].

Key words: Gamma rays: observations – Cosmic rays – Radio continuum: ISM – ISM: clouds – ISM: supernova remnants

* Member of CONICET

Send offprint requests to: J.A. Combi, first address

© European Southern Observatory (ESO) 1998

Online publication: April 28, 1998