Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.269..394k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 269, NO. 2/JUL15, P. 394, 1994
Astronomy and Astrophysics
Astronomy
49
Scientific paper
The stars of the parent galaxies inject matter into extragalactic jets in the form of stellar winds. From the present-day estimated mean mass-loss rate by stars in ellipticals, A? 10-12 M0 yr - 1, we can infer that the mass injected is high enough to slow the jets of weak FR4 radio sources down to subrelativistic velocities, but not FR-lI jets. This deceleration overcomes the apparent contradiction between the unification scheme for FR4s and BL Lacs and the low velocities of FR-I jets at kiloparsec scales. In this paper the interaction between a relativistic e -e+ jet and stellar winds is considered, and the conditions under which total mixing is achieved are found. A quasi-one-dimensional approximation of the fluid model with a smoothly distributed source of mass is used to study the dynamics of these mass-loaded jets in a galaxy with a King distribution of stars and a Hubble distribution of intergalactic gas. The solutions found can qualitatively explain the behaviour of the FR4 jets near their `gaps', but underestimate the observed lengths of the gaps. It is proposed that the development of a turbulent boundary may be crucially important in the dynamics of the FR-I jets. Key words: hydrodynamics - galaxies: active - galaxies: jets.
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