The Role of Magnetic Fields in Spiral Galaxies

Details The Role of Magnetic Fields in Spiral Galaxies The Role of Magnetic Fields in Spiral Galaxies

2002-12-12

arxiv.org/abs/astro-ph/0212288v1

Astrophys.Space Sci. 289 (2004) 293-302

Astronomy and Astrophysics

Astrophysics

10 pages with 3 figures. To be published in "From Observations to Self-Consistent Modelling of the ISM in Galaxies", eds. M. A

Scientific paper

Interstellar magnetic fields are strong: up to 25 muG in spiral arms and 40 muG in nuclear regions. In the spiral galaxy NGC 6946 the average magnetic energy density exceeds that of the thermal gas. Magnetic fields control the evolution of dense clouds and possibly the global star formation efficiency in galaxies. Gas flows and shocks in spiral arms and bars are modified by magnetic fields. Magnetic forces in star-forming circumnuclear regions are able to drive mass inflow towards the active nucleus. Magnetic fields are essential for the propagation of cosmic rays and the formation of galactic winds and halos.

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