Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236...33h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 1, Sept. 1990, p. 33-46.
Astronomy and Astrophysics
Astronomy
53
Astronomical Photometry, Galactic Cosmic Rays, Halos, Radio Emission, Spiral Galaxies, Optical Properties, Radio Astronomy, Radio Spectra, Very Large Array (Vla)
Scientific paper
Radio continuum measurements at 327 MHz and 1.49 GHz and optical surface photometry are presented for NGC 4631. They provide new results on the propagation of relativistic electrons in the radio halo of this galaxy. The radio spectrum shows a break of about 0.4 at a break frequency of about 1 GHz, and the spectral index in the plane between 327 MHz and 1.49 GHz is -0.45 (significantly larger than the spectral indices obtained at higher frequencies). The z-extent of the radio halo changes with frequency, the rate of change becoming smaller at lower frequencies, but in the northern part of the radio halo the radio spectrum does not change with z-distance. These findings are consistent with models that incorporate convection and adiabatic cooling due to a galactic wind.
Dettmar Ralf-Juergen
Hummel Evi
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