Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aj.....88.1736i&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 88, Dec. 1983, p. 1736-1748.
Astronomy and Astrophysics
Astronomy
86
Continuous Spectra, Galactic Radio Waves, Radio Galaxies, Radio Spectra, Spiral Galaxies, Thermal Emission, Astronomical Maps, Centimeter Waves, Elliptical Galaxies, Radiant Flux Density
Scientific paper
The authors have observed a total of 136 galaxies at one or more of four frequencies: 430, 834, 4750, and 10700 MHz. For a subset of these, spectral indices could be determined. The authors find a mean value α = -0.68±0.04 (Sν ∝ να) over the whole frequency range covered. The mean high frequency spectral index (4.9 - 10.7 GHz) for Sc galaxies is α = -0.55±0.07, which indicates the presence of significant amounts of thermal emission in a considerable fraction of the sample. At 10.7 GHz the mean thermal contribution to the radio emission of the sample Sc galaxies is 35±15 per cent; for the sample Sb galaxies this is 20±15 per cent.
Israel Frank P.
van der Hulst J. M.
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