On the low frequency radio spectrum of spiral galaxies

Details On the low frequency radio spectrum of spiral galaxies On the low frequency radio spectrum of spiral galaxies

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...251..442h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 251, no. 2, Nov. 1991, p. 442-446.

Astronomy and Astrophysics

Astronomy

16

Cosmic Rays, Interstellar Matter, Radio Spectra, Spiral Galaxies, Continuous Radiation, Low Frequencies, Radio Astronomy

Scientific paper

The low frequency radio continuum data on spiral galaxies published by Israel and Mahoney (1990) is reanalyzed. It is concluded that most spiral galaxies do indeed show a change in spectral index with frequency but that the amount of the change is not significantly dependent on the inclination of the galaxies. The latter makes the free-free absorption model proposed to explain the flattening at low frequencies less compelling. A steepening of the spectrum at high frequencies (greater than 1 GHz) due to propagation effects of the relativistic electrons is at least equally plausible.

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