Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..745..148t&link_type=abstract
HIGH ENERGY GAMMA-RAY ASTRONOMY: 2nd International Symposium on High Energy Gamma-Ray Astronomy. AIP Conference Proceedings, Vo
Astronomy and Astrophysics
Astronomy
6
Elliptical Galaxies, Jets And Bursts, Galactic Winds And Fountains
Scientific paper
The slow collimation of the relativistic jet of M87 which collimates from a wide opening angle of about 60° at sub parscec scales to a smaller angle of about 10° at the pc scale is modelled by means of a two-component MHD outflow consisting of a relativistic wind-type outflow from a central source and a non relativistic wind from a surrounding disk. We employ a numerical code for the direct numerical solution of the steady state problem in the zone of super fast magnetized flow and show that in this two-component model it is possible to easily collimate into a cylindrical jet all the mass and magnetic fluxes which are available from the central source. This magnetic collimation occurs over the scales suggested by observations of the M87 jet after the jet undergoes several oscillations in its width, as also found by earlier analytical solutions. A layer of increased density surrounds the collimated jet, a result consistent with an emissivity which is observed to be much higher in a thin boundary layer than elsewhere in the jet.
Bogovalov Sergei
Tsinganos Kanaris
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