Turbulence and Large-Scale Magnetic Fields in Irregular Galaxies

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

Our observations of the dwarf irregular galaxy NGC 4449 imply that also very slowly and disorderly rotating objects may possess regular magnetic fields filling the whole disk, even away from star-forming regions, and penetrating into an extended gaseous envelope. We found regular, uni-directional fields ordered over domains constituting a large fraction of the disk and of a surprisingly high strength, comparable to that of total fields in nearby spirals. A mechanism producing such coherent fields in a manner, similar to the turbulent dynamo in fast rotating spirals, apparently works in this very slowly and chaotically rotating object, too.

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