Astronomy and Astrophysics – Astronomy
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.214...87j&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 214, May 1, 1985, p. 87-95.
Astronomy and Astrophysics
Astronomy
306
Elliptical Galaxies, Galactic Clusters, Interacting Galaxies, Seyfert Galaxies, Star Formation, Starburst Galaxies, Stellar Mass Ejection, Cosmic Gases, Emission Spectra, Infrared Spectra, Interactions, Luminosity, Mass To Light Ratios, Molecular Clouds
Scientific paper
The subset of galaxy-galaxy interactions which have resulted in a merger are, as a class, ultraluminous IR galaxies. Their IR luminosities span a narrow range which overlaps with the most luminous Seyfert galaxies. However, in contrast with Seyfert galaxies, the available optical, IR, and radio properties of mergers show no evidence for a compact nonthermal central source, and are easily understood in terms of a burst of star formation of extraordinary intensity and spatial extent; they are 'superstarbursts. It is argued that superstarbursts occur in the evolution of most mergers, and the implications of superstarbursts for the suggestion that mergers evolve into elliptical galaxies are discussed. Finally, it is noted that merger-induced shocks are likely to leave the gas from both galaxies in dense molecular form which will rapidly cool, collapse, and fragment. Thus a merger might in fact be expected to result in a burst of star formation of exceptional intensity and spatial extent, i. e., a superstarburst.
Joseph Robert D.
Wright Gillian S.
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