Turbulent jets and the energy budget in Fanaroff-Riley class-I radio sources

Details Turbulent jets and the energy budget in Fanaroff-Riley class-I radio sources Turbulent jets and the energy budget in Fanaroff-Riley class-I radio sources

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986cajph..64..495b&link_type=abstract

(Conference on Jets from Stars and Galaxies, Toronto, Canada, June 24-27, 1985) Canadian Journal of Physics (ISSN 0008-4204), vo

Astronomy and Astrophysics

Astronomy

3

Energy Budgets, Radio Jets (Astronomy), Radio Sources (Astronomy), Turbulent Jets, Astronomical Models, Brightness, Flow Velocity, Mach Number

Scientific paper

The theory that the jets in Fanaroff-Riley class-I radio sources are turbulently expanding and decelerating owing to the related entrainment provides a simple explanation for the usual slow decline of jet-surface brightness in class-I radio sources. A turbulent jet model in which the velocity variation is inferred from the spreading rate is presented and applied to the main jet in NGC 315. Besides providing a reasonable fit to the surface-brightness variation, the model provides the following simple explanation for the collimation behavior of this jet. Initially, the jet is turbulent but becomes nonturbulent owing to the effect of an increasing Mach number and a favorable pressure gradient causing the jet to collimate. As the pressure flattens out to the background pressure, the jet becomes turbulent again and starts to reexpand. Various implications of the energy budget for the estimation of jet velocity and density are examined, and further implications of the model are discussed.

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