On The Radio Emission From Some Peculiar Galaxies

Abstract

Radio observations have been made of 18 galaxies whose spectra and colours in their central regions are abnormal for their morphological types (Markarian 1963). Observations at 1410 and 2650 Mcls were made with the CSIRO 210 ft steerab1e telescope at Parkes, and at 408 Mcls with the east-west arm of the Mills Cross at the Molonglo Observatory of the University of Sydney. Radio emission was detected from the central regions of 13 of these galaxies. For these 13 the radio index (mr-mpg) is about 1·2 and differs by IiLbout two magnitudes from that of normal spirals. Absolute radio magnitudes of the galaxies are about -21·0. In most cases the presence of radio emission is accompanied by emission lines in the optical spectra. It is concluded that the enhanced radio emission of the galaxies investigated is due to the production of relativistic electrons in their active nuclei.