Radio flux measurements of normal galaxies at 80, 160 and 8870 MHz.
Abstract
Radio flux measurements of 76 galaxies are given. Each galaxy was observed at least at one of the frequencies of 80, 160 and 8870 MHz. A low-frequency cut-off in the spectra of optically bright radio weak galaxies is a common feature. Free-free absorption seems to be a likely mechanism for the observed low frequency cut-off. The change in spectral index over the cut-off point is higher at high spectral indices. It is greatest for Sc and Sbc galaxies and becomes smaller for earlier type galaxies.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- November 1975
- Bibcode:
- 1975A&A....44..101H
- Keywords:
-
- Galactic Radiation;
- Radiant Flux Density;
- Radio Spectra;
- Cut-Off;
- Position Errors;
- Spectrum Analysis;
- Spiral Galaxies;
- Tables (Data);
- Astrophysics