The relation between magnetic and gas arms in spiral galaxies

Details The relation between magnetic and gas arms in spiral galaxies The relation between magnetic and gas arms in spiral galaxies

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.297..860m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 297, Issue 3, pp. 860-866.

Astronomy and Astrophysics

Astronomy

28

Magnetic Fields, Mhd, Galaxies: Magnetic Fields, Galaxies: Spiral

Scientific paper

The intriguing question of the origin of the arm-like magnetic structures seen between the optical spiral arms of certain spiral galaxies is addressed. Using a two-dimensional approximation to the non-linear disc dynamo equation, it is shown that gas streaming along the arms may produce such a field configuration. Another possibility is a spiral modulation of the turbulent diffusivity, associated with an enhancement of turbulence in the interstellar medium within the arms. The effects of a similar modulation of the alpha-effect are also examined. Finally, the consequences of a non-linear feedback of the large-scale field on the turbulent diffusivity (`epsilon-quenching') are briefly discussed.

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