The radio rings of Hercules A

Details The radio rings of Hercules A The radio rings of Hercules A

Jun 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988natur.333..640m&link_type=abstract

Nature (ISSN 0028-0836), vol. 333, June 16, 1988, p. 640-642.

Astronomy and Astrophysics

Astronomy

9

Radio Galaxies, Radio Jets (Astronomy), Radio Sources (Astronomy), Particle Beams, Relativistic Particles, Rings, Spherical Waves

Scientific paper

A regular sequence of broken circular rings of enhanced radio intensity is found in one lobe of the Hercules A double radio source. The five rings fit a simple kinematic model in which the rings are projected spherical shells of higher radio brightness. In the model, the shells grow as spherical waves with a uniform speed of expansion, all from a single common site of origin, roughly where the narrow input jet widens sharply. A model of inelastic proton-proton collisions within dense filamentary condensations of the input jet is proposed for the five initiating particle bursts. Source development contrasts sharply with that inferred for the prototype radio double, Cygnus A, where the radio lobe is nearly stationary and the electrons are newly energized at the outermost end of the lobe. The two sources point to quite distinct mechanisms for generating radio-emitting plasmas.

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