The Central Radio Gap and the equatorial emission region in SS433

Details The Central Radio Gap and the equatorial emission region in SS433 The Central Radio Gap and the equatorial emission region in SS433

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..266p&link_type=abstract

Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at

Computer Science

2

Scientific paper

The radio jet X-ray binary SS433 was observed at four epochs by very long baseline interferometry (VLBI) technique at different frequencies. The innermost region of the source on milli-arcsecond scales (1 mas ~ 5 AU) is resolved into an eastern and a western core-jet component, well separated by a central radio gap (25-30 AU projected size), where the binary stellar system is located. We suggest that the radio gap is caused by local synchrotron self-absorption and external free-free absorption in an ionized medium, which has a disk-like geometry. On 100 AU scales there is an emission region oriented roughly perpendicularly to the jets, with variable occurence at different epochs. Both the central radio gap and the equatorial emission region could be interpreted with a mass outflow from the system, concentrated in the orbital plane of the binary.

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