Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989aj.....98..524h&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 98, Aug. 1989, p. 524-537.
Astronomy and Astrophysics
Astronomy
19
Galaxies, H Lines, Infrared Astronomy Satellite, Galactic Nuclei, Luminosity, Star Formation, Tides
Scientific paper
H-I line profiles have been obtained for a sample of 37 galaxies. Thirty of these galaxies have IRAS fluxes representing a wide range of infrared luminosites and spectra. The galaxies also represent five levels of optical activity, nonactive, LINERs, H-II galaxies, Sy 2, and Sy 1. They also have a wide range of tidal interaction activity with other galaxies. The behavior of H-I is studied within a scenario that relates tidal events with star formation, dust formation, IR luminosity, and nuclear activity in galaxies. A strong correlation is found between H-I and IR luminosity, which appears to be in the form of an excess of H-I emission related to the interaction events. Detached weak extra H-I components are common, and H-I absorption components are seen in several objects. H-I outflow is indicated in most cases. Relative velocities are of the order of a few hundred km/s. The most strongly disturbed galaxies also have peculiar H-I profiles. A fit to the Tully-Fisher relation indicates a mean extinction of about 1 mag for the group, and a general spread in the relation with no systematic effects.
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