Testing the cosmological evolution of magnetic fields in galaxies with the SKA

Details Testing the cosmological evolution of magnetic fields in galaxies with the SKA Testing the cosmological evolution of magnetic fields in galaxies with the SKA

2008-12-16

arxiv.org/abs/0812.2984v1

Astronomy and Astrophysics

Astrophysics

2 pages, contribution to the proceedings of the IAU Symposium 259 "Cosmic Magnetic Fields: from Planets, to Stars and Galaxies

Scientific paper

10.1017/S1743921309031512

We investigate the cosmological evolution of large- and small-scale magnetic fields in galaxies at high redshifts. Results from simulations of hierarchical structure formation cosmology provide a tool to develop an evolutionary model of regular magnetic fields coupled to galaxy formation and evolution. Turbulence in protogalactic halos generated by thermal virialization can drive an efficient turbulent dynamo. The mean-field dynamo theory is used to derive the timescales of amplification and ordering of regular magnetic fields in disk and dwarf galaxies. For future observations with the SKA, we predict an anticorrelation at fixed redshift between galaxy size and the ratio between ordering scale and galaxy size. Undisturbed dwarf galaxies should host fully coherent fields at z<1, spiral galaxies at z<0.5.

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