Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....95.1040f&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 95, April 1988, p. 1040-1046.
Astronomy and Astrophysics
Astronomy
7
Astronomical Maps, Charge Coupled Devices, Galactic Nuclei, Infrared Astronomy Satellite, Luminosity, Satellite Imagery, Active Galactic Nuclei, Isophotes
Scientific paper
CCD images of Arp 220 (IC 4553) at V, R, and I wavelengths are presented. These images show clearly that the dark lane across the face of the object gradually disappears from visual to near-infrared wavelengths, revealing a single nucleus. Extinction as a function of wavelength between V and R suggests that larger than normal dust grains may be present. It has been proposed by other investigators that enhanced infrared luminosity results from galaxy-galaxy interactions. Some conditions on the number density of galaxies implied by this hypothesis are derived based on models for the lifetime of the enhanced activity. It is shown that random interactions occur too infrequently, but that the number of observed double galaxy systems is too great, to account for the number of IRAS galaxies seen. Another hypothesis for the origin of high-luminosity galaxies may be in physical conditions that lead to an initial mass function in star formation that is different from that in the Galaxy.
Friedman Scott David
Jones Barbara
Stein Wayne A.
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