The strength of galactic magnetic fields

Astronomy and Astrophysics – Astronomy

Scientific paper

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Field Strength, Interstellar Magnetic Fields, Irregular Galaxies, Magellanic Clouds, Gamma Ray Observatory, Radio Emission, Star Formation Rate, Starburst Galaxies, X Ray Astronomy

Scientific paper

Measurements of the gamma-ray flux from the Magellanic Clouds together with radio continuum data are used here to estimate the strength of the magnetic fields in these galaxies without having to invoke energy equipartition. It is found that the assumption of energy equipartition is not valid in these irregular galaxies and that the validity cannot be restored by changing the electron/proton ratio. Supporting evidence for this conclusion comes from radio and X-ray observations of the starburst galaxy M82. The results imply that these galactic fields are too large to have been generated by dynamo action alone, and it is suggested that recent star formation might instead provide the generating mechanism.

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