Magnetic Fields are not ignorable in the dynamics of disks

Details Magnetic Fields are not ignorable in the dynamics of disks Magnetic Fields are not ignorable in the dynamics of disks

2000-09-25

arxiv.org/abs/astro-ph/0009391v1

Astronomy and Astrophysics

Astrophysics

2 pages, 1 figure, for ASP Conference Series: "Galaxy Disks and Disk Galaxies", eds. J.G. Funes S.J. and E.M. Corsini

Scientific paper

Magnetic fields are considered to be dominant when $\epsilon_{B}\geq\epsilon_{K}$, being $\epsilon_{B}=B^{2}/8\pi$ the magnetic energy density and $\epsilon_{K}=1/2 \rho\theta^{2}$ the rotation energy density, for a conventional moderate B= 1 $\mu$G. They are considered to be negligible when $\epsilon_{B}<\epsilon_{K}$ for $B\sim 10 \mu$G. With no assumption and no theoretical calculation, we show that magnetic fields cannot be ignored in the outer parts of a galaxy like the Milky Way and in the whole disk of a dwarf galaxy.

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