Volume 422, Number 2, August I 2004
|Page(s)||L29 - L32|
|Published online||09 July 2004|
Letter to the Editor
A microquasar shot out from its birth place
Service d'Astrophysique, CEA-Saclay, 91191 Gif-sur-Yvette, France e-mail: firstname.lastname@example.org
2 Instituto de Astronomía y Física del Espacio/Conicet. Bs As, Argentina
3 Instituto de Física, Universidade Federal do Rio Grande do Sul, CP 15001, 91501-970 Porto Alegre, RS, Brazil
4 Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, PR China
Accepted: 25 May 2004
We show that the microquasar LS I +61° 303 is running away from its birth place in a young complex of massive stars. The supernova explosion that formed the compact object shot out the X-ray binary with a linear momentum of km s-1, which is comparable to the linear momenta found in solitary runaway neutron stars and millisecond pulsars. The properties of the binary system and its runaway motion of km s-1 imply that the natal supernova was asymmetric and that the upper limit for the mass that could have been suddenly ejected in the explosion is ~2 . The initial mass of the progenitor star of the compact object that is inferred depends on whether the formation of massive stars in the parent stellar cluster was coeval or a sequential process.
Key words: stars: individual: LS I +61° 303, 2CG 135+01, 3EG J0241+6103 / X-rays: binaries: stars / gamma-rays: observations / gamma-rays: theory
© ESO, 2004
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