Global properties of interacting disk-type galaxies

Details Global properties of interacting disk-type galaxies Global properties of interacting disk-type galaxies

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...320...49b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 320, Sept. 1, 1987, p. 49-72. Research supported by the University of Illin

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239

Astronomical Photometry, Disk Galaxies, Far Infrared Radiation, Galactic Nuclei, Interacting Galaxies, Radio Observation, Stellar Evolution, Computational Astrophysics, Infrared Astronomy, Stellar Luminosity

Scientific paper

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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