Equipartition magnetic fields in normal galaxies

Aritra Basu* and Subhashis Roy
National Centre for Radio Astrophysics, Pune University Campus, Ganeshkhind Road, Pune 411007, India

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We studied the total magnetic field strength in normal starforming galaxies estimated using energy equipartition assumption. Using the well known radio–far infrared correlation we demonstrate that the equipartition assumption is valid in galaxies at sub-kpc scales. We nd that the magnetic field strength is strongly correlated with the surface star formation rate in the galaxies NGC 6946 and NGC 5236. Further, we compare the magnetic field energy density to the total (thermal + turbulent) energy densities of gas (neutral + ionized) to identify regions of efficient field amplification in the galaxy NGC 6946. We find that in regions of efficient star formation, the magnetic field energy density is comparable to that of the total energy density of various interstellar medium components and systematically dominates in regions of low star formation efficiency.

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