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Rapidly Evolving Circularly Polarized Emission during the 1994 Outburst of GRO J1665-40 | | J-P Macquart
; K. Wu
; R.J. Sault & D.C. Hannikainen
; | | Date: |
1 Oct 2002 | | Journal: | Astron.Astrophys. 396 (2002) 615-622 | | Subject: | astro-ph | | Affiliation: | Kapteyn Inst.), K. Wu (MSSL, U. Syd), R.J. Sault (ATNF) & D.C. Hannikainen (U. Southampton, U. Helsinki | | 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 2.4GHz, but not at 4.8 and 8.4GHz, 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. | | Source: | arXiv, astro-ph/0210031 | | Services: | Forum | Review | PDF | Favorites | |
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