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Magnetism in the nearby galaxy M 33

Published online by Cambridge University Press:  01 November 2008

F. S. Tabatabaei ,
M. Krause ,
R. Beck  and
A. Fletcher
F. S. Tabatabaei
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany email: tabataba@mpifr-bonn.mpg.de, mkrause@mpifr-bonn.mpg.de, rbeck@mpifr-bonn.mpg.de
M. Krause
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany email: tabataba@mpifr-bonn.mpg.de, mkrause@mpifr-bonn.mpg.de, rbeck@mpifr-bonn.mpg.de
R. Beck
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany email: tabataba@mpifr-bonn.mpg.de, mkrause@mpifr-bonn.mpg.de, rbeck@mpifr-bonn.mpg.de
A. Fletcher
Affiliation:
School of Mathematics and Statistics, Newcastle University, Newcastle upon Tyne, NE1 7RU, U.K., email: andrew.fletcher@ncl.ac.uk
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Abstract

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Using high-resolution data of the linearly polarized intensity and polarization angle at 3.6, 6.2, and 20 cm together with a 3-D model of the regular magnetic field, we study variations of the structure, strength, and energy density of the magnetic field in the Scd galaxy M 33. The regular magnetic field consists of a horizontal component (represented by an axisymmetric mode from 1 to 3 kpc radius and a superposition of axisymmetric and bisymmetric modes from 3 to 5 kpc radius) and a vertical component. However, the inferred ‘vertical field’ may be partly due to a galactic warp. We estimate the average total and regular magnetic field strengths as ≃6.4 and 2.5 μG, respectively. Generation of interstellar magnetic fields by turbulent gas motion in M 33 is indicated as the turbulent and magnetic energy densities are about equal.

Keywords

Galaxies: individual: M33 – radio continuum: galaxies – galaxies: magnetic field – galaxies: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S259: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies , November 2008 , pp. 545 - 546
Copyright
Copyright © International Astronomical Union 2009

References

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Fletcher, A., Berkhuijsen, E. M., Beck, R., & Shukurov, A. 2004, A&A 414, 53Google Scholar
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