Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/45125
Title: The changing milliarcsecond radio morphology of the gamma-ray binary LS 5039
Author: Ribó Gomis, Marc
Paredes i Poy, Josep Maria
Moldón Vara, Francisco Javier
Martí Ribas, Josep
Massi, M.
Keywords: Radiofonts
Radioastronomia
Astrofísica
Estels binaris de raigs X
Radio sources (Astronomy)
Radio astronomy
Astrophysics
X-ray binaries
Issue Date: 2008
Publisher: Springer Verlag
Abstract: LS 5039 is one of the few TeV emitting X-ray binaries detected so far. The powering source of its multiwavelength emission can be accretion in a microquasar scenario or wind interaction in a young nonaccreting pulsar scenario. Aims.To present new high-resolution radio images and compare them with the expected behavior in the different scenarios. Methods.We analyze Very Long Baseline Array (VLBA) radio observations that provide morphological and astrometric information at milliarcsecond scales. Results.We detect a changing morphology between two images obtained five days apart. In both runs there is a core component with a constant flux density, and an elongated emission with a position angle (PA) that changes by 12 $\pm$ $3\degr$ between both runs. The source is nearly symmetric in the first run and asymmetric in the second one. The astrometric results are not conclusive. Conclusions.A simple and shockless microquasar scenario cannot easily explain the observed changes in morphology. An interpretation within the young nonaccreting pulsar scenario requires the inclination of the binary system to be very close to the upper limit imposed by the absence of X-ray eclipses.
Note: Versió postprint del document publicat a: http://dx.doi.org/10.1051/0004-6361:20078390
It is part of: Astronomy and Astrophysics, 2008, vol. 481, num. 1, p. 17-20
Related resource: http://dx.doi.org/10.1051/0004-6361:20078390
URI: http://hdl.handle.net/2445/45125
ISSN: 0004-6361
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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