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Published online by Cambridge University Press: 14 August 2015
High resolution observations of the radio continuum emission from nearby galaxies at several frequencies provide information about the cosmic ray electrons. Optimum results are expected by combining low-frequency synthesis observations with high-frequency single dish data, e.g. Westerbork 610 MHz / Effelsberg 10.7 GHz (1′ resolution) or Cambridge 150 MHz / Effelsberg 2.7 GHz (4′ resolution). Maps of 15 nearby spiral galaxies at 10.7 GHz have been made with the Effelsberg 100-m telescope. Maps of M31 and M33 are available at 2.7 and 4.8 GHz.