Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268...25b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 1, p. 25-34.
Astronomy and Astrophysics
Astrophysics
70
Astronomical Models, Galactic Evolution, Interacting Galaxies, Starburst Galaxies, Astronomical Photometry, Astronomical Spectroscopy, Mass To Light Ratios, Star Formation
Scientific paper
Evolutionary models are applied here to starburst galaxies in a sample of 30 interacting or merged systems in order to determine the duration of the starbursts. The time delay between bursts in both components of interacting pairs of disk galaxies is investigated and it is found that starbursts in the minor galaxies of these pairs started earlier than those in the major galaxies. While strong starbursts are found to be active for only about 2 x 10 exp 7 yrs, the time delay between the bursts in both components of the interacting pairs can be significantly larger. Delays of up to 2 x 10 exp 8 yrs are found in the sample. Model fits show that the mass-to-luminosity ratios of strong central starbursts indicate a deficiency of low-mass stars in the starburst initial mass function. The required low-mass-star deficiency is smaller than previously believed.
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