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Issue A&A
Volume 410, Number 2, November I 2003
Page(s) L1 - L4
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20031314-1



A&A 410, L1-L4 (2003)
DOI: 10.1051/0004-6361:20031314

Letter

Hadronic gamma-ray emission from windy microquasars

G. E. Romero1, D. F. Torres2, M. M. Kaufman Bernadó1 and I. F. Mirabel3, 4

1  Instituto Argentino de Radioastronomía, CC 5, (1894) Villa Elisa, Buenos Aires, Argentina
2  Lawrence Livermore National Laboratory, 7000 East Avenue, L-413, Livermore, CA 94550, USA
3  CEA/DSM/DAPNIA/Service d'Astrophysique, Centre d'Études de Saclay, 91191 Gif-sur-Yvette, France
4  Instituto de Astronomía y Física del Espacio/CONICET, CC 67, Suc. 28, Buenos Aires, Argentina

(Received 1 July 2003 / Accepted 2 September 2003)

Abstract
The jets of microquasars with high-mass stellar companions are exposed to the dense matter field of the stellar wind. We present estimates of the gamma-ray emission expected from the jet-wind hadronic interaction and we discuss the detectability of the phenomenon at high energies. The proposed mechanism could explain some of the unidentified gamma-ray sources detected by EGRET instrument on the galactic plane.


Key words: X-rays: binaries -- stars -- gamma-rays: observations -- gamma-rays: theory

Offprint request: G. E. Romero, romero@venus.fisica.unlp.edu.ar

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© ESO 2003


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