The cauldron at the core of SS 433

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Neutron Stars, Plasma Jets, Variable Stars, X Ray Sources, Astronomical Models, Collimation, Magnetopause, Radio Stars, X Ray Stars

Scientific paper

The authors propose that the jets in SS433 are accelerated just outside the magnetopause of a magnetized neutron star. In order to be accelerated by electron scattering radiation pressure, the jets must carry a highly supercritical energy flux, L > 1039 erg s-1. This energy may be supplied by one of two processes: (1) a highly inhomogeneous shower of 'broomsticks' or blobs on to the surface of the neutron star; or (2) the rapid spin of the neutron star, which causes the oblique magnetosphere to drive shocks into the surrounding gas. In either case, the magnetopause defines the extent of a 'cauldron' within which radiant energy is violently mixed with gas settling in from outside. The weight of the slowly accreting gas determines the size of the magnetosphere. From the observed collimation and velocity of the SS433 jets the authors infer the properties of the confining cloud and constrain the parameters of the energy source.

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