Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..558..299t&link_type=abstract
HIGH ENERGY GAMMA-RAY ASTRONOMY: International Symposium. AIP Conference Proceedings, Volume 558, pp. 299-311 (2001).
Astronomy and Astrophysics
Astronomy
Active And Peculiar Galaxies And Related Systems, Magnetohydrodynamics And Plasmas
Scientific paper
Some general features of ideal MHD plasma outflows from rotating and magnetized central gravitating objects such as AGN are briefly discussed. The asymptotic structure, morphology and degree of collimation of the outflow are analyzed in the light of a family of exact solutions produced via a nonlinear separation of the variables in the full set of the MHD equations. Among the interesting features of this solution is a quantitative energetic criterion for the transition of the morphologies of the outflows from highly collimated jets to uncollimated winds. It is proposed that in a space where the two main variables are the energy of the magnetic rotator and the angle between the line of sight and the ejection axis, some observed characteristics of AGN can be understood. Thus, while the horizontal AGN classification from Type 0 to Types 1 and 2 is mainly an orientation effect, as in the standard model, the vertical AGN classification as those with uncollimated outflows (radio-quiet sources: Seyferts, QSO's) and collimated outflows (radio-loud sources: radio galaxies and Blazars) depends on the efficiency of the magnetic rotator and the environment in which the outflows propagate. .
Sauty Christophe
Trussoni Edoardo
Tsinganos Kanaris
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