Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...136..313p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 136, no. 2, July 1984, p. 313-318.
Astronomy and Astrophysics
Astronomy
13
Galactic Structure, Magnetohydrodynamic Turbulence, Radio Jets (Astronomy), Acceleration (Physics), Cascade Flow, Luminosity, Mach Number, Synchrotron Radiation
Scientific paper
An investigation is made of the efficiency of turbulence produced by large hydrodynamic instabilities such as Kelvin-Helmholtz and internal shear to make radio-jets shine. Assuming that most of the power of a turbulent cascade is absorbed by radiating particles, the contribution of hydrodynamic instabilities to luminosity is deduced. Analysis of stochastic acceleration with synchrotron losses makes it possible to predict a high turnover frequency in the millimeter band. The efficiency of the turbulent cascade is very sensitive to variation of the Mach number, and this could explain the morphological differences between low luminosity sources with supersonic flow and high luminosity sources with hypersonic flow.
Pelletier Guy
Zaninetti Lorenzo
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