Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2011-07-12
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
58 pages, 31 figures, accepted for publication in ApJ
Scientific paper
10.1088/0004-637X/740/1/21
This paper provides testable predictions about starlight polarizations to constrain the geometry of the Galactic magnetic field, in particular the nature of the poloidal component. Galactic dynamo simulations and Galactic dust distributions from the literature are combined with a Stokes radiative transfer model to predict the observed polarizations and position angles of near-infrared starlight, assuming the light is polarized by aligned anisotropic dust grains. S0 and A0 magnetic field models and the role of magnetic pitch angle are all examined. All-sky predictions are made, and particular directions are identified as providing diagnostic power for discriminating among the models. Cumulative distribution functions of the normalized degree of polarization and plots of polarization position angle vs. Galactic latitude are proposed as tools for testing models against observations.
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