Gas dynamical calculations on extragalactic double radio sources

Details Gas dynamical calculations on extragalactic double radio sources Gas dynamical calculations on extragalactic double radio sources

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....75..149n&link_type=abstract

Astronomy and Astrophysics, vol. 75, no. 1-2, May 1979, p. 149-157. Research supported by the Nederlandse Organisatie voor Zuiv

Computer Science

Numerical Analysis

8

Cosmic Plasma, Extragalactic Radio Sources, Gas Dynamics, Plasma Dynamics, Channel Flow, Hypersonic Speed, Mach Number, Numerical Analysis, Plasma Clouds, Radio Galaxies

Scientific paper

In this paper, gas dynamical calculations of the time evolution of double radio sources are presented on the basis of a simple plasma model. In particular, the influence of an intergalactic medium on a plasma cloud moving at hypersonic speeds is studied. At hypersonic speeds ram pressure confines the bulk plasma of the cloud and in many cases a compact region ('hot spot') is formed from which the cloud loses material to the surrounding gas. The dependence of a stopping distance on density, temperature, and Mach number is investigated. It is argued on the basis of this plasmamodel that sources inside clusters need not be smaller, statistically, than those outside. Channel formation and evolution is discussed. It is found that density gradients in the intergalactic medium have no important influence on the source dynamics at hypersonic speeds. Different radio source morphologies may be expected depending whether or not relativistic particle pressures are important over the whole evolution of the source.

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