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The Effect of Cosmic Rays on Galactic Magnetic Field Evolution

Iryna Butsky, Ohio Supercomputer Center

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Steven Gordon, Iryna Butsky, Daven Cocroft

Using hydrodynamical simulations of isolated spiral disk galaxies, I will study the effects of cosmic rays on the galactic magnetic field evolution. These simulated galaxies will be magnetized solely by the injected magnetic fields of supernova remnants, which are also sources of cosmic rays. I will introduce a new prescription for the interaction of cosmic rays with the galactic magnetic field, which I will add to the existing framework of magnetohydrodynamic capabilities within the Enzo code. Due to the coupled interactions between cosmic rays and the magnetic field, I expect to find that cosmic rays amplify the rate magnetic field growth and are more efficient in expanding the resulting field into the surrounding dark matter halo.