MERLIN Observations of the Radio Jets of SS433

Details MERLIN Observations of the Radio Jets of SS433 MERLIN Observations of the Radio Jets of SS433

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995yera.conf...12j&link_type=abstract

The XXVIIth Young European Radio Astronomers Conference, ed. D.A. Green and W. Steffen, in association with Cambridge University

Astronomy and Astrophysics

Astronomy

3

Scientific paper

The unusual binary star SS433 was observed on 5 epochs in December, 1991 and January, 1992 using the United Kingdom's Multi-Element Radio Linked Interferometer Network (MERLIN) operating at a frequency of 5 GHz. The maps produced from this data show the characteristic ``S-shaped'' morphology of SS433's precessing jets. These jets were demonstrated to behave, in general, as dictated by the ``Kinematic Model''. Several knots of radio emission in the jets were identified and their motion could be followed between the images. By studying their evolution, these knots were shown to be ballistic, not slowing down noticeably before fading from view and by comparing their apparent velocity with the predictions of the Kinematic Model the distance to SS433 was measured at 4.7 +/- 0.3 kpc. The brightness evolution of the knots was found to be consistent with exponential decay of time constant 16 days. Two anomalous knots were identified and believed to be caused by drastic variation of the jet ejection velocity.

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