Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.225...27a&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 225, March 1, 1987, p. 27-42.
Astronomy and Astrophysics
Astronomy
52
Emission Spectra, Galactic Evolution, Plasma Dynamics, Radio Galaxies, Spectrum Analysis, Astronomical Spectroscopy, Electron Acceleration, Magnetic Field Configurations, Radio Spectra, Relativistic Particles
Scientific paper
Radio data from the VLA and 5-km telescope at five frequencies and at a resolution of 5.0 x 8.3 sq arcsec have been used to determine the variation of spectrum across 3C234. The results are a good fit to the standard model in which relativistic electrons are accelerated in the hotspots and lose energy as they move out into the lobes. Electrons in the region surrounding the eastern hotspots are found to have suffered anomalously large energy losses - perhaps because of sudden adiabatic expansion. There is evidence for reacceleration in the western lobe near to the central source, probably due to stochastic acceleration in fluid-dynamical turbulence. The dynamics of the radio-emitting plasma are investigated by means of the ageing analysis and inferred magnetic field directions. A model invoking bulk transport in the plasma due to backflow, and/or galactic motion with respect to the 3C234 cluster, appears to be the most plausible. The age analysis, shape of the source, and magnetic field configuration all suggest the existence of backflow in the eastern lobe which has been deflected by the presence of the host galaxy.
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