Evolution of luminous IRAS sources - Radio imaging

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Evolution, Infrared Sources (Astronomy), Luminosity, Radio Sources (Astronomy), Astronomical Spectroscopy, Galactic Nuclei, Infrared Astronomy Satellite, Optical Properties, Very Large Array (Vla)

Scientific paper

Observations of the compact radio morphology of 111 luminous IRAS-selected active galaxies covering a wide range of IR and optical properties are presented and discussed. Of these sources, 72 are observed for the first time with the VLA A configuration. The circumnuclear radio sources are generally small and weak, with 15 nondetections to a limit of about 0.4 mJy. Comparison with the IR and optical properties of the objects indicates that the radio sources turn on within 10 exp 8 yr of the tidal encounter that is presumed to generate the IR activity. However, the radio sources do not all appear at the same time. The radio observations are consistent with the evolution scenario for luminous IRAS galaxies suggested by Hutchings and Neff (1991).

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