Optical positions and 327 MHz flux-densities of UGC galaxies in selected Westerbork fields

Details Optical positions and 327 MHz flux-densities of UGC galaxies in selected Westerbork fields Optical positions and 327 MHz flux-densities of UGC galaxies in selected Westerbork fields

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26as..100..263o&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 100, no. 2, p. 263-285.

Astronomy and Astrophysics

Astronomy

5

Flux Density, Optical Measurement, Position (Location), Radio Galaxies, Spiral Galaxies, Far Infrared Radiation, Infrared Astronomy Satellite, Luminosity, Radio Emission, Radio Spectra

Scientific paper

The study presents accurate optical positions of 421 UGC galaxies which are used to search for 30 92-cm WSRT fields observed for emission from these galaxies. Good 92-cm flux densities were obtained for 140 galaxies, marginal flux densities for 71 galaxies, and upper limits for 210 galaxies. For 35 galaxies, spectral indices in the decimeter wavelength range are determined. The mean spectral index for spiral galaxies (0.72 +/- 0.03) is very similar to that of elliptical galaxies (0.64 +/- 0.10). The four multiple systems in the sample have a much flatter spectral index (-0.21 +/- 0.07), from which the presence of a significant thermal component in their total radio emission is suggested. Comparison with IRAS results show that about half of the galaxies detected at radio wavelengths are detected in the FIR. It is proposed that some spiral galaxies are anomalously weak in the IR as compared with their radio brightness.

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