Environmental properties of violently star-forming galaxies

Astronomy and Astrophysics – Astrophysics

Scientific paper

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H Ii Regions, Interacting Galaxies, Irregular Galaxies, Star Formation, Starburst Galaxies, Astronomical Catalogs, H Beta Line, Infrared Astronomy Satellite, Metallicity, Nuclear Astrophysics

Scientific paper

A sample of 71 objects from the Spectrophotometric Catalogue of H II galaxies (Terlevich et al., 1990) has been searched for neighboring objects. According to the metallicity, IRAS colors, morphology, and environmental circumstances, the objects have been classified in six different groups. Specific denominations are proposed for each class, from nuclear starburst galaxies to irregular blue galaxies and blue compact dwarf galaxies. Blue irregular and blue compact objects have lower metallicities and higher f25 microns/f100 microns color indices than nuclear starburst objects, indicating different evolutionary histories. All the nuclear starbursts and blue irregulars have massive companions, but only 2/3 of the blue compacts do have. The hypothesis of cloud-cloud collisions or galaxy-galaxy interactions to understand the triggering mechanism for the violent star formation is briefly discussed.

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