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Astronomy & Astrophysics manuscript no. (will be inserted by hand later) Rapidly Evolving Circularly Polarized Emission during the 1994 Outburst of GRO J1655-40

By J. -p. Macquart, K. Wu, R. J. Sault and D. C. Hannikainen

Abstract

the date of receipt and acceptance should be inserted later Abstract. 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

Year: 2002
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