Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....97.1561h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 97, June 1989, p. 1561-1565.
Astronomy and Astrophysics
Astronomy
17
Galactic Clusters, Radio Emission, Active Galaxies, Flux Density, Mapping, Relativistic Electron Beams
Scientific paper
The diffuse radio emission in the central part of the Coma cluster of galaxies has been extensively studied at relatively high radio frequencies, but the information available at low frequencies is quite sparse. A map of the radio halo in the Coma cluster has been made at 30.9 MHz using the University of Maryland's Clark Lake radio telescope. Because a more precise process was used to remove the flux of the superimposed discrete sources than was previously possible, the error estimate for the flux of the halo at this frequency has been significantly reduced. If the radiation is due to synchrotron emission from relativistic electrons, these observations give information about the population of electrons radiating at low energies. Knowing the flux and extent of the halo at a low frequency helps to constrain the possible models of halo formation.
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