Extended radio sources - The effects of particle acceleration and radiative losses on source dynamics

Details Extended radio sources - The effects of particle acceleration and radiative losses on source dynamics Extended radio sources - The effects of particle acceleration and radiative losses on source dynamics

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..456c&link_type=abstract

Astrophysical Journal, Part 1, vol. 234, Dec. 1, 1979, p. 456-465.

Astronomy and Astrophysics

Astronomy

17

Particle Acceleration, Radiative Transfer, Radio Sources (Astronomy), Relativistic Effects, Shock Wave Propagation, Synchrotron Radiation, Astrodynamics, Astronomical Models, Bow Waves, Energy Dissipation, Plasma Heating

Scientific paper

A model for the dynamics of ram pressure confined plasmoids is developed in the context of extended radio source theory which, for the first time, includes the effects of radiative energy losses and any internal energy gains due to interaction of the plasmoid and the external bow shock flow. Numerical solutions are obtained for the plasmoid's radius, velocity, internal energy, distance traveled, and luminosity as functions of time. It is found that the evolution of a ram confined plasmoid is highly sensitive to the relative magnitudes of any inferred heating mechanisms (e.g., particle acceleration) and any radiative losses. While it is generally recognized that some form of internal heating is required (in order to maintain the energies of the relativistic particles responsible for the radio luminosity), we find that too large an enhancement in internal energy (such as would occur if particle acceleration is inefficient) causes very rapid expansion. This in turn leads to shorter stopping distances and rapidly declining luminosities in comparison with plasmoids having negligible coupling to the bow shock flow. Conversely, the dominance of radiative losses in a plasmoid's internal energy balance leads to contraction which prolongs its hydrodynamic lifetime and enhances its penetrating power.

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