Magnetic fields and the outer rotation curve of M31

Dr. Beatriz Ruiz Granados

Abstract

Recent observations of the rotation curve of M31 show a rise of the outer part that cannot be understood in terms of standard dark matter models or perturbations of the galactic disc by M31's satellites. In this talk, we show a possible explanation of this dynamical feature based on the influence of the magnetic field within the thin disc. We have considered standard mass models for the luminous mass distribution, a Navarro-Frenk-White model to describe the dark halo, and we have added up the contribution to the rotation curve of a magnetic field in the disc. We have found a significant improvement of the fit in the outer part when magnetic effects are considered. Our best-fit requires a field strength of ~ 4μG which is compatible with the observations of the magnetic fields in M31.

About the talk

Magnetic fields and the outer rotation curve of M31
Dr. Beatriz Ruiz Granados
Instituto de Astrofísica de Canarias, Spain
Wednesday October 20, 2010 - 0:00  (Aula)
en     en

For published article see Ruiz-Granados et al.

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