Discovery of circularly polarised radio emission from SS 433

Details Discovery of circularly polarised radio emission from SS 433 Discovery of circularly polarised radio emission from SS 433

1999-11-23

arxiv.org/abs/astro-ph/9911425v1

ApJ 530, L29, 2000

Astronomy and Astrophysics

Astrophysics

Accepted for publication in ApJ Letters

Scientific paper

10.1086/312481

We report the discovery of circularly polarised radio emission from the radio-jet X-ray binary SS 433 with the Australia Telescope Compact Array. The flux density spectrum of the circular polarization, clearly detected at four frequencies between 1 - 9 GHz, has a spectral index of (-0.9 +/- 0.1). Multiple components in the source and a lack of very high spatial resolution do not allow a unique determination of the origin of the circular polarization, nor of the spectrum of fractional polarization. However, we argue that the emission is likely to arise in the inner regions of the binary, possibly via propagation-induced conversion of linear to circular polarization, and the fractional circular polarization of these regions may be as high as 10%. Observations such as these have the potential to investigate the composition, whether pairs or baryonic, of the ejecta from X-ray binaries.

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