Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26as...90...55v&link_type=abstract
Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 90, no. 1, Oct. 1991, p. 55-81. Research supported by NWO.
Astronomy and Astrophysics
Astronomy
24
Extragalactic Radio Sources, Galaxies, Radio Astronomy, Southern Sky, Star Formation, Very Large Array (Vla), Active Galactic Nuclei, Far Infrared Radiation, H Alpha Line, Infrared Astronomy Satellite, Interacting Galaxies, Luminosity, Radiant Flux Density, Starburst Galaxies, Thermal Emission
Scientific paper
Results are reported of observations of 76 extreme IRAS galaxies with high far-infrared/blue luminosity ratios at 6-cm wavelength with the VLA in order to investigate the star-forming regions unimpeded by dust. CCD images and spectra of these objects are presented, as well as CO(1-0) spectra of a subsample. Twenty radio sources were found to be clearly resolved with intrinsic sizes, ranging from 0.6 to 2.2 kpc; the upper limits for the intrinsic size of the unresolved sources are 0.2-1.3 kpc. The resolved sources have a surface brightness similar to that of galactic nuclei, but considerably higher than that of galactic disks. On average, some 60 percent of the total flux density derived from the low-resolution maps is found in the high-resolution data. About 40 percent of the total radio power emitted by the galaxies at 6 cm has a thermal origin. This ratio is consistent with published radio spectral indices of similar extreme IRAS galaxies.
de Jong Teije
Driel Wim van
van den Broek A. C.
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