Radio and infrared observations of (almost) one hundred non-Seyfert Markarian galaxies

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Far Infrared Radiation, Flux Density, Hubble Diagram, Markarian Galaxies, Radio Emission, Seyfert Galaxies, Galactic Evolution, Peculiar Galaxies, Point Sources, Radio Bursts, Spiral Galaxies, Star Formation, Starburst Galaxies, Stellar Color, Stellar Luminosity

Scientific paper

The 13 cm flux densities of 96 non-Seyfert Markarian galaxies were measured at Arecibo Observatory. Far infrared flux densities have been published for 78 of these galaxies in the IRAS catalog. The radio, infrared, and optical fluxes of these galaxies and of a magnitude limited sample of normal galaxies were compared to clarify the nature of the radio emission in Markarian galaxies. It was found that Markarian galaxies of a given apparent magnitude and Hubble type generally have radio fluxes several times higher that the fluxes typical of normal galaxies of the same magnitude and type. Remarkably, the ratio of radio flux to far infrared flux is nearly the same for most of these starburst galaxies and for normal spiral disks. However, the compact and peculiar Markarian galaxies consistently have about 60% more radio flux per unit infrared flux than the other Markarian galaxies and the normal spirals. It is not clear whether this difference reflects a difference in the evolution of the starbursts in these galaxies or whether there is excess radio emission of nonstellar origin.

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