Star formation and nuclear activity in Seyfert galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Active Galactic Nuclei, Seyfert Galaxies, Star Formation, Extragalactic Radio Sources, H Ii Regions, Infrared Sources (Astronomy), Star Formation Rate, Supernova Remnants

Scientific paper

A probable correlation between radio structure and IRAS spectrum in Seyfert galaxies is reported. For Seyfert galaxies known to exhibit the observational characteristics of vigorous star formation, the correlation between 1.4 GHz and 60 micron fluxes is in excellent agreement with that found for other extragalactic star formation regions. The far-IR radiation observed by IRAS from these galaxies is predominantly thermal emission from dust heated by hot stars. On the other hand, Seyfert galaxies with radio emission dominated by 'linear' structures tend to have relatively flat 25-100 micron spectra, and the ratio of their 1.4 GHz to 60 micron flux densities is considerably higher than that for star-forming regions. The radio and far-IR emission from this class appear to be dominated by the Seyfert nucleus, with the far-IR originating directly from a nonthermal source or from dust heated by one.

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