Volume 396, Number 2, December III 2002
|Page(s)||615 - 621|
|Section||Interstellar and circumstellar matter|
|Published online||03 December 2002|
Rapidly evolving circularly polarized emission during the 1994 outburst of GRO J1655–40
Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 AV Groningen, The Netherlands
2 Mullard Space Science Laboratory, University College London, Holmbury St Mary, Surrey RH5 6NT, UK, and School of Physics A28, University of Sydney, NSW 2006, Australia e-mail: email@example.com
3 Australia Telescope National Facility, Narrabri, NSW 2390, Australia e-mail: firstname.lastname@example.org
4 Department of Physics and Astronomy, Southampton University, Southampton, SO17 1BJ, UK
5 Observatory, PO Box 14, 00014 University of Helsinki, Finland e-mail: email@example.com
Corresponding author: J.-P. Macquart, firstname.lastname@example.org
Accepted: 24 September 2002
We report the detection of circular polarization during the 1994 outburst of the Galactic microquasar GRO J1655-40. The circular polarization is clearly detected at 1.4 and 2.4 GHz, but not at 4.8 and 8.4 GHz, where its magnitude never exceeds 5 mJy. Both the sign and magnitude of the circular polarization evolve during the outburst. The time dependence and magnitude of the polarized emission can be qualitatively explained by a model based on synchrotron emission from the outbursts, but is most consistent with circular polarization arising from propagation effects through the relativistic plasma surrounding the object.
Key words: black hole physics / galaxies: active / galaxies: jets / polarization / radio continuum: galaxies / X-rays: individual: GRO J1655-40
© ESO, 2002
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