Spectral index variations of the Galactic radio continuum emission - Evidence for a Galactic wind

Astronomy and Astrophysics – Astronomy

Scientific paper

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Continuous Radiation, Disk Galaxies, Galactic Radio Waves, Radio Emission, Radio Spectra, Low Frequencies, Sky Surveys (Astronomy), Thermal Emission

Scientific paper

The distribution of spectral indices of the galactic radio continuum emission between 408 MHz and 1420 MHz across the northern sky is discussed.The observed spectral index variations are not in agreement with a static or purely convective halo of the Galaxy. The authors find a qualitative agreement with the cooling-convection halo models as proposed by Lerche and Schlickeiser (1982), which are based on the existence of a galactic wind. Spectral index data derived from observations in the frequency range below 408 MHz are also consistent with this interpretation. A model of the spectral index distribution of the Galaxy as seen edge-on is compared with available observations of haloes around edge-on galaxies. It is concluded that these observations are not sensitive enough for a detailed comparison.

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