EDP Sciences
Free access
Volume 370, Number 1, April IV 2001
Page(s) L5 - L8
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20010297

A&A 370, L5-L8 (2001)
DOI: 10.1051/0004-6361:20010297

The radio surroundings of the microquasar GRO J1655-40

J. A. Combi1, G. E. Romero1, P. Benaglia1 and I. F. Mirabel2, 3

1  Instituto Argentino de Radioastronomía, C.C.5, (1894) Villa Elisa, Buenos Aires, Argentina
2  CEA/DMS/DAPNIA/Service D'Astrophysique, Centre d'Études de Saclay, 91191 Gif-sur-Yvette, France
3  Instituto de Astronomía y Física del Espacio (IAFE), C.C. 67, Suc. 28, Buenos Aires, Argentina

(Received 12 February 2001 / Accepted 22 February 2001 )

We report the results of a study of the radio surroundings of the superluminal microquasar GRO J1655-40. We have searched for extended continuum structures that might be indicative of the presence of a supernova remnant (SNR) associated with the formation of the compact object in the binary system. We also carried out HI-line observations of the region looking for a local minimum created by an explosive event. Our results indicate that there is, in fact, a bubble in the large-scale HI distribution around GRO J1655-40. We suggest that this structure might be created by the original supernova explosion occurred a few hundred thousand years ago and whose signatures can be traced by the overabundance of $\alpha$-elements recently found by Israelian et al. (1999) in the companion star.

Key words: X-rays: stars -- stars: evolution -- ISM: bubbles -- ISM: supernova remnants

Offprint request: J. A. Combi, pauletich@sinectis.com.ar

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