Volume 385, Number 2, April II 2002
|Page(s)||L10 - L13|
|Published online||15 April 2002|
Letter to the Editor
Precessing microblazars and unidentified gamma-ray sources
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
Corresponding author: M. M. Kaufman Bernadó, email@example.com
Accepted: 13 February 2002
The recent discovery by Paredes et al. ([CITE]) 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
© ESO, 2002
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