Global properties of interacting disk-type galaxies
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Abstract
Optical, far-IR, and radio observations of global properties are presented for a sample of strongly interacting disk-type galaxies. Global star formation rates (SFRs) for the galaxies span a large range and are, on average, a factor of 2.5 higher than similarly determined global SFRs for isolated spiral galaxies. New star formation occurs preferentially in or near the nuclear regions. H I 21 cm emission-line profiles indicate the presence of anomalous velocity material and chaotic patterns of gas motion in many interacting systems. Few systems show evidence for the presence of a well-organized rotating H I disk such as are seen in isolated spiral galaxies. Neutral hydrogen gas mass-to-blue luminosity ratios are not atypical when compared with isolated spirals. The evidence indicates that local rather than global properties of these galaxies govern the star-formation process. The observations generally support the notion that enhanced SFRs are caused by increased cloud collision rates and dissipative flows of gas to the nucleus.
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