New constraints on galactic CRE transport from radio continuum observations
July 22, 2019
The importance of cosmic rays and magnetic fields for the physics of the
interstellar medium and the evolution of galaxies is demonstrated by a number
of recent numerical simulations. We present new observations of the cosmic ray electron transport as well as the magnetic field strength and structure in galactic halos from radio-continuum polarization studies of edge-on disk galaxies obtained by the CHANG-ES (Continuum Halos in Nearby Galaxies - an EVLA Survey) project.
The observations are discussed in the context of transport models for Cosmic Ray Eelctrons (CREs) from the star-forming disks into the halo. The observations also allow to derive the magentic field structure in galactic halos. In addition, it is demonstrated how recent low frequency observations of edge-on galaxies with LOFAR help to further constrain the problem.
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