Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.215..437c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 215, Aug. 1, 1985, p. 437-451.
Astronomy and Astrophysics
Astronomy
31
Active Galaxies, Galactic Clusters, Radio Sources (Astronomy), Astronomical Maps, Diffuse Radiation, Galactic Nuclei, Turbulent Wakes
Scientific paper
The Cambridge Low-Frequency Synthesis Telescope has been used to map the Coma cluster at 151 MHz. Two new extended sources are found, associated with the cluster galaxies NGC 4839 and NGC 4849. The central halo radio source is shown not to have a simple symmetrical structure but to be distorted, with separate centres of brightening near the radio galaxies NGC 4874 and IC 4040. The structure cannot be accounted for by cluster-wide acceleration processes but implies a close connection with current radio galaxies and, in particular, models requiring diffusion of electrons out of radio sources seem to be favoured. The other large source, near Coma A, is detected and higher resolution data at 140 MHz are used to clarify its structure. It seems probable that it is a relic of past activity in the galaxy NGC 4798, although its spectral-index distribution is unlike those of known radio-tail sources.
No associations
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