Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...201....1w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 201, no. 1, July 1988, p. 1-8.
Astronomy and Astrophysics
Astronomy
16
Continuous Radiation, Emission Spectra, Galactic Cosmic Rays, Astronomical Models, Radio Astronomy, Spectral Energy Distribution
Scientific paper
An answer to the question, how do the cosmic rays propagate in the disk and halo of a galaxy, is given by many models. In the dynamical halo model, which includes diffusion, convection, adiabatic deceleration and energy losses of the cosmic-ray electrons, precise predictions about the integrated radio spectrum of the electrons, the frequency dependence of the halo extent, and the spectral index variation along the galactic height have been made (Lerche and Schlickeiser, 1981). These predictions were tested with multifrequency observations of the edge-on galaxy NGC 4631 using the 100-m radio telescope in Effelsberg at high frequencies (6 and 2.8 cm) and the 3-km synthesis radio telescope in Westerbork at low frequencies (49 and 21 cm). The results confirm the predictions and lead to the conclusion that there exists a galactic wind incorporating hot gas, protons, nuclei, electrons and magnetic fields in and above the disk of this galaxy.
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