Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259..462l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 2, p. 462-472.
Astronomy and Astrophysics
Astronomy
20
Galactic Evolution, Galactic Structure, Infrared Astronomy Satellite, Infrared Photometry, Interacting Galaxies, Active Galaxies, Far Infrared Radiation, Near Infrared Radiation, Star Formation
Scientific paper
This paper presents near-infrared photometry and coadded IRAS data for a sample of 19 interacting and merging galaxy systems selected by IRAS flux and morphological criteria. The far-infrared activity LFIR/LB rises with interaction strength. There are also changes in the far-infrared colors: log(f12/f25) is lower and log(f60/f100) higher for strong interactions. This behavior can be understood in the context of two-component models of the far-infrared emission as an increase in the contribution of active star formation to the infrared activity. The near-infrared colors of the galaxies are studied, and the use of K-L color excesses to search for far-infrared emission is justified. The distribution of infrared activity in binary galaxies is analyzed with the help of K-L color excesses and confirmed using IRAS data. Contrary to some earlier studies, it is found that enhanced activity in both components of an interacting system is frequent. The implications of this behavior for the conditions necessary to trigger starbursts are discussed. The occurrence of a significant number of systems with infrared activity in both galaxies suggests that disturbances of the gaseous component leading to starbursts may be less sensitive to the relative orientation of the interacting galaxies than disturbances of the stellar component leading to prominent tidal tails.
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