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Astron. Astrophys. 351, 156-160 (1999)

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SS433: on the uniqueness of cool relativistic jets

A.A. Panferov 1,2

1 Nicolaus Copernicus Astronomical Center, Bartycka 18, 00716 Warsaw, Poland (panferov@camk.edu.pl)
2 Special Astrophysical Observatory, Nizhnij Arkhyz, 357147 Russia (panf@sao.ru)

Received 8 March 1999 / Accepted 29 April 1999


The relativistic jets of SS433 are outstanding for their optical thermal radiation, which is produced by small clouds ([FORMULA] cm) with lifetimes about [FORMULA] times larger than the gas-dynamical crushing time. We show that the clouds reside in thermal and dynamical balance as long as they collide with the wind of the supercritical accretion disk. This interaction is caused by the precessional movement of the jets and takes place only in the sweep-out zone, beyond which the interaction ceases and optical jets merely terminate. The cloud's magnetic field, amplified in course of movement through a medium, could play a role in containing a cloud. This interaction provides the clue to the uniqueness of the optical jets of SS433.

Key words: stars: individual: SS 433 – ISM: jets and outflows

© European Southern Observatory (ESO) 1999

Online publication: November 2, 1999