Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.171..105k&link_type=abstract
(IAU, European Regional Astronomy Meeting, 11th, La Laguna, Spain, July 3-8, 1989) Astrophysics and Space Science (ISSN 0004-640
Astronomy and Astrophysics
Astronomy
6
Computerized Simulation, Jet Flow, Radio Sources (Astronomy), Supersonic Flow, Turbulent Flow, Galactic Nuclei, Intergalactic Media, Interstellar Matter, Mach Number, Quasars, Radio Galaxies
Scientific paper
A fluid model of the jets in Fanaroff-Riley I class radio sources based on the idea that they are supersonic turbulent pressure confined flows consisting of relativistic and nonrelativistic gases is described. Numerical simulations are used to investigate the properties of such flows propagating through typical atmospheres of an elliptical. The models whose parameters agree with the observational constraints on FR-I jets power, density, velocity, Mach number, spreading rate, and pressure of relativistic particles are calculated. Natural assumptions such as a conservation of relativistic particles an equipartition of energy between magnetic field and turbulent motions are used to estimate the intensity evolution along simulated jets. It is concluded that an effective acceleration of relativistic particles is required to acccount for the observed FR-I jet brightness distribution.
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