Astronomy and Astrophysics – Astronomy
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372..419m&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 372, May 10, 1991, p. 419-423. NSERC-supported research.
Astronomy and Astrophysics
Astronomy
17
Far Infrared Radiation, Radio Emission, Radio Sources (Astronomy), Spiral Galaxies, Interstellar Matter, Luminosity, Seyfert Galaxies, Star Formation
Scientific paper
It is found that the far-IR and radio luminosities of a sample of spirals in high-density environments from the Hickson Compact Group Catalog (1982) are highly correlated even though the radio radiation originates almost entirely in extranuclear regions for most of the spirals. A comparison of the above correlation with that for a sample of isolated spirals shows that, statistically, the total radio emission from the group spirals is lower by about a factor of 2 than the isolated spirals. These results can be interpreted on the basis of a model in which interactions among group galaxies produce inflow of gas toward the centers, resulting in enhanced star formation, which in turn produces enhancement of far-IR and radio radiation from those regions. At the same time, removal of gas and magnetic fields from the disk of the galaxies results in a decrease of total radio emission from those galaxies. It is interesting that, except for one Seyfert galaxy, the radio luminosities of all the group galaxies are less than about 10 to the 22nd W/Hz at 20 cm, which suggests that the high-density environment is not conducive for the development of powerful radio sources at the present epoch.
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