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For refcode 1990MNRAS.247..444G:
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Copyright by Royal Astronomical Society. 1990MNRAS.247..444G Effects of interactions on the radio properties of non-Seyfert galaxies G. Giuricin, G. Bertotti, F. Mardirossian and M. Mezzetti Dipartimento di Astronomia, Universita di Trieste, via GB Tiepolo 11, 34131 Trieste, Italy Centro Interuniversitario Regionale per l'Astrofisica e la Cosmologia (CIRAC), Strada Costiera 11, 34014 Trieste, Italy Center for Advanced reseach in Space Optics, Padriciano 99, Trieste, Italy Accepted 1990 June 14. Received 1990 June 11; in original form 1990 February 12 SUMMARY On the basis of radio surveys published in the literature we have compared the radio properties of samples of relatively isolated spiral galaxies with LINER- and H II- region-like nuclei (hereafter called L and H galaxies) with corresponding samples of non-Seyfert interacting galaxies, in order to explore the effects of interactions on their radio properties. Basically, we have found enhanced total and central radio emission (per light unit) in interacting H galaxies (compared with their relatively isolated counterparts) and enhanced central radio emission (per light unit) in interacting L galaxies. Analogous enhancements in the strength of the total and nuclear H{alpha} emission lines are observed in interacting galaxies. Furthermore, within a sample of interacting galaxies, there appears to be evidence of enhanced total and central radio emission (per light unit) in strongly interacting galaxies which are likely to have H II-region-like nuclei, compared with moderately interacting objects of the same nuclear type. Interacting H galaxies contain more extended central radio sources than isolated galaxies, whereas no difference in this sense is observed in the case of L galaxies. L galaxies which contain, on average, weaker total and central radio sources than the H galaxies have, on average, smaller central radio sources (of greater radio surface brightness) than the H galaxies and follow a less-steep logarithmic radio power-radio size relation. As regards the Seyfert galaxies, which are known to be characterized by powerful central radio emission, we have found that they contain, on average, central radio sources of intermediate size, which obey a power-size relation of intermediate steepness (with respect to the L and H galaxies). Thus our statistical study reveals basic structural differences between the radio properties of the L, H and Seyfert galaxies, and between the effects of interactions on the radio properties of the three classes of galaxies.
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