Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3607m&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #36.07; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
SS433 is the best known example of a precessing jet. As well as the large scale precession there is also a smaller nutation seen in the optical lines. We observed SS433 over 17 days in August 2005 with the Very Long Baseline Array. These observations were part of a larger X-ray and optical spectroscopy campaign. SS433 was observed with the VLBA at 15 GHz, giving a resolution of less than 1 mas (3 AU). Another advantage of the high frequency is that the core region is much less affected by absorption, and can be imaged directly. The images presented here show that the inner 5 mas of the jet look very similar from day to day, apart from a slight change in position angle. This is especially interesting because, with jet proper motions of 7-10 mas/day, this inner jet should be completely renewed each day. The position angle shift in the inner jet is very similar to the nutation seen in the optical lines, the first time this effect has been imaged.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
Mioduszewski Amy J.
Rupen Michael P.
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