EDP Sciences
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Volume 385, Number 2, April II 2002
Page(s) L10 - L13
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20020251

A&A 385, L10-L13 (2002)
DOI: 10.1051/0004-6361:20020251


Precessing microblazars and unidentified gamma-ray sources

M. M. Kaufman Bernadó1, G. E. Romero1 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'Etudes de Saclay, 91191 Gif-sur-Yvette, France
3  Instituto de Astronomía y Física del Espacio/CONICET, C.C. 67, Suc. 28, Buenos Aires, Argentina

(Received 22 January 2002 / Accepted 13 February 2002 )

The recent discovery by Paredes et al. (2000) of a persistent microquasar that is positionally coincident with an unidentified gamma-ray source has open the possibility that other sources in the Third EGRET Catalog could be interpreted as microquasars as well. In this letter we show that some variable unidentified EGRET sources in the galactic plane could be produced by faint, otherwise undetected microquasars with precessing jets. When the jet points towards the observer, gamma-ray emission resulting from upscattered stellar photons could be detectable yielding a variable source with weak or undetectable counterpart at longer wavelengths. Strategies for detecting these "microblazars" with forthcoming satellites are briefly discussed.

Key words: X-ray binaries -- stars: early-type -- gamma-rays: observations -- gamma-rays: theory

Offprint request: M. M. Kaufman Bernadó, mar@vianw.com.ar

SIMBAD Objects in preparation

© ESO 2002