The Equatorial Outflow of SS433

Details The Equatorial Outflow of SS433 The Equatorial Outflow of SS433

2002-07-02

arxiv.org/abs/astro-ph/0207061v2

in: Ros E., Porcas R.W., Lobanov A.P. and Zensus J.A. (eds.) Proc. 6th European VLBI Network Symposium, p. 263, MPIfR, Bonn (2

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures (from 6 ps files), presented at the 6th EVN Symposium in Bonn, Germany, 25-28 June 2002. Note that fig. 2 i

Scientific paper

We present VLBI imaging results for SS433 from the period 1995-2000. An equatorial emission region is detected and confirmed in 7 experiments at 1.6 and 5 GHz. The structure of the region changes with time on scales of weeks to months. The nature of emission is unknown, but it is certainly non-thermal, maybe optically thin synchrotron. The spectrum however might be attenuated by a thermal population of electrons. There were previous indications for an equatorial outflow from the system. We do detect outward motion of a radio component, and estimate a speed of 1200/sin(i) km/s. Theoretical work and IR observations suggest that the mass-loss rate in SS433 is much higher in this region than in the jets. We suggest that the high-mass microquasars might all have equatorial outflows; in fact, it is the dominant form of mass-loss in these systems.

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