The origin of magnetic fields associated with galaxies is still a matter
of debate. One theory attributes it to
a dynamo-like mechanism in rhe
galaxies, while the other contends
that the dynamo is long dead and
the magnetic field is constant. Both
the theories are based on magneto-hydrodynamics which says that
magnetic field is frozen into the
Researchers have recently reported the existence of magnetic spiral arms in the galaxy NGC6946, This finding could have major implications on the understanding of the mechanism responsible for the magnetic field, since it is difficult to explain a pure magnetohydrodynamic origin of such an effect.
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