Magnetic Fields and the Outer Rotation Curve of M31

Bibcode
2010ApJ...723L..44R
DOI
10.1088/2041-8205/723/1/L44
Ruiz-Granados, B.; Rubiño-Martín, J. A.; Florido, E.; Battaner, E.
Bibliographical reference

The Astrophysical Journal Letters, Volume 723, Issue 1, pp. L44-L48 (2010).

Advertised on:
11
2010
Number of authors
4
IAC number of authors
2
Citations
25
Refereed citations
19
Description
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.
Related projects
Full-sky map showing the spatial distribution of the primary anisotropies of the Cosmic Microwave Background (generated 380,000 years after the Big Bang) derived from observations of the Planck satellite
Anisotropy of the Cosmic Microwave Background

The general goal of this project is to determine and characterize the spatial and spectral variations in the temperature and polarisation of the Cosmic Microwave Background in angular scales from several arcminutes to several degrees. The primordial matter density fluctuations which originated the structure in the matter distribution of the present

Rafael
Rebolo López
In progress
Type
Refereed
Galaxies
Magnetic fields
Cosmology & Astroparticles (CYA, CTA)

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