The effects of interactions on spiral galaxies. II - Disk star-formation rates

Details The effects of interactions on spiral galaxies. II - Disk star-formation rates The effects of interactions on spiral galaxies. II - Disk star-formation rates

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93.1011k&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 93, May 1987, p. 1011-1023.

Astronomy and Astrophysics

Astronomy

354

Galactic Evolution, Interacting Galaxies, Spiral Galaxies, Star Distribution, Star Formation, Star Formation Rate, Galactic Structure, H Alpha Line, Infrared Astronomy Satellite, Luminosity

Scientific paper

H-alpha emission-line and IRAS far-IR observations of interacting spiral and irregular galaxies are here used to assess the influence of interactions on their global star-formation rates. Two samples of interacting galaxies were observed: a complete sample of close pairs, and an Arp atlas sample of peculiar systems. When compared to a control sample of single galaxies, both samples of interacting systems exhibit systematically higher levels of H-alpha and infrared emission on average, and a larger dispersion in emission properties. Emission levels in the very active system are much more strongly correlated with the properties of the interaction than with the internal properties of the galaxies themselves. Strong disk emission is almost always accompanied by unusually strong nuclear activity. Simple star-formation burst models can reproduce the observed H-alpha equivalent widths and broadband colors of most of the galaxies. The bursts are relatively short (few times 10 million yr) and rarely involve more than 1-2 percent of a galaxy's total mass.

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