Bibcode
Ruiz-Granados, B.; Rubiño-Martín, J. A.; Florido, E.; Battaner, E.
Referencia bibliográfica
The Astrophysical Journal Letters, Volume 723, Issue 1, pp. L44-L48 (2010).
Fecha de publicación:
11
2010
Número de citas
25
Número de citas referidas
19
Descripción
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 disk by M31's satellites. Here,
we propose an explanation of this dynamical feature based on the
influence of the magnetic field within the thin disk. 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
disk, which is described by an axisymmetric pattern. Our conclusion is
that a significant improvement of the fit in the outer part is obtained
when magnetic effects are considered. The best-fit solution requires an
amplitude of ~4 μG with a weak radial dependence between 10 and 38
kpc.
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