A composite plot of far-infrared versus radio luminosity, and the origin of far-infrared luminosity in quasars

Astronomy and Astrophysics – Astronomy

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Far Infrared Radiation, Luminosity, Quasars, Radio Emission, Active Galactic Nuclei, Radio Galaxies, Seyfert Galaxies, Starburst Galaxies

Scientific paper

A composite plot of far-infrared versus radio luminosity for late type galaxies, Seyferts, quasars and radio galaxies is constructed. The most striking result is that the radio and far-infrared luminosities of radio-quiet quasars are correlated and follow the same correlation as normal star-forming galaxies and ultraluminous infrared galaxies, whereas the radio-loud quasars have luminosites in both bands similar to those of radio galaxies. It is concluded that the far-infrared emission from radio-quiet quasars is from star-forming host galaxies and not from active galactic nuclei. The far-infrared radio plot may be a powerful discriminator between host galaxy type.

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