Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-01-10
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
2 pages, 1 figure, in the proceedings of the IAU Symposium 259: "Cosmic magnetic fields: from planets, to stars and galaxies",
Scientific paper
10.1017/S1743921309031251
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 M33. 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 $\mu$G, respectively. Generation of interstellar magnetic fields by turbulent gas motion in M33 is indicated as the turbulent and magnetic energy densities are about equal.
Beck Rainer
Fletcher Adam
Krause Marita
Tabatabaei Fatemeh S.
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