Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...132...80b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 132, no. 1, March 1984, p. 80-88.
Astronomy and Astrophysics
Astrophysics
7
Centimeter Waves, Continuous Spectra, Galactic Nuclei, Galactic Radio Waves, Radio Galaxies, Radiant Flux Density
Scientific paper
A search has been made for 5 GHz continuum emission from a sample of 12 isolated galaxies and a control sample of 17 galaxies in small groups with the Westerbork radio telescope array. The selection of these samples is discussed and compared with previous work. Only two nuclei were detected at a level of about 2 mJy, both of them belonging to isolated galaxies. Three point sources possibly located in the galaxy disks were detected, as well as a number of background sources. Extended disk emission was detected with a similar degree of success both in the isolated and the nonisolated samples. It is concluded that at this level there is no difference in the radio properties of the two samples. The possibility that thermal bremsstrahlung is responsible for the excess U-band radiation observed in the nuclei of the isolated galaxies, is also ruled out, unless very high temperatures or densities are invoked.
Brosch Noah
Krumm Nathan
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