A Westerbork survey of clusters of galaxies. VI - Measurements of the halo radio source in the Coma cluster

Westerbork observations at 610 MHz of the halo radio source in the Coma cluster are presented. It is shown that the total flux density of the radio source is 1.2 plus or minus 0.5 Jy and that its half-power Gaussian diameter is 33 arcmin. Furthermore it is argued that the highly polarized radio emission which was detected at the position of the Coma cluster is actually associated with an extended greater than 2 deg of arc Galactic feature. A lower limit of the intracluster magnetic-field strength of 1 ten-millionth G is derived.