Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...341..679h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 341, June 15, 1989, p. 679-684. Research supported by NSERC.
Astronomy and Astrophysics
Astronomy
56
Galactic Clusters, Infrared Sources (Astronomy), Interacting Galaxies, Spiral Galaxies, Infrared Astronomy Satellite, Luminosity, Point Sources, Space Density, X Ray Sources
Scientific paper
A search of the IRAS Point Source Catalog, Version 2 has revealed infrared sources within 1 arcmin of the optical centers of 54 galaxies in Hickson's catalog of compact groups of galaxies. The 60-micron luminosity function for these galaxies has the same shape as the luminosity function of the IRAS bright galaxy sample. The space density of IRAS galaxies in compact groups is 60 times smaller than the space density of IRAS bright galaxies, indicating that of order 1 percent of all bright IRAS galaxies are in compact groups. The infrared emission from these galaxies is compared with the emission from samples of isolated galaxies by Keel et al. (1985) and cluster galaxies studied by Bicay and Giovanelli (1987). The fractional distribution of the ratio of far-infrared to optical luminosity of compact group galaxies is significantly larger than that of the isolated galaxies and comparable to that of the cluster galaxies. These results indicate that infrared emission is enhanced in the compact group galaxies, probably because of interactions.
Hickson Paul
Menon T. K.
Palumbo Giorgio G. C.
Persic Massimo
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