A self-similar model for extragalactic radio sources

Kaiser, C.R. and Alexander, P. (1997) A self-similar model for extragalactic radio sources. Monthly Notices of the Royal Astronomical Society, 286, (1), 215-222.


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An analytical model for extragalactic radio sources with pressure-confined jets is presented. We show that the properties of the bow shock and of the gas surrounding these objects force the sources to grow in a self-similar way provided the density in the external atmosphere falls less steeply than 1/d^2. Results from observations and numerical simulations are used to develop a self-consistent model for the large-scale structure of FRII objects. The jets in these sources are shown to be stable against turbulence for the observed properties of FRIIs and the divide between FRI and FRII objects in jet power is reproduced. The overall dynamics of a source are derived as a function of time and depend on the external density, the jet power and the scaleheight of the external atmosphere. Derived dynamical ages are consistent with observed spectral ages.

Item Type: Article
Subjects: Q Science > QC Physics
Divisions : University Structure - Pre August 2011 > School of Physics and Astronomy > Astronomy and Space Science
ePrint ID: 14765
Accepted Date and Publication Date:
Date Deposited: 28 Feb 2005
Last Modified: 31 Mar 2016 11:27
URI: http://eprints.soton.ac.uk/id/eprint/14765

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