Polarized Emission of Edge-On Galaxies in Comparisson with the Cosmic-Ray Driven Dynamo Model

Details Polarized Emission of Edge-On Galaxies in Comparisson with the Cosmic-Ray Driven Dynamo Model Polarized Emission of Edge-On Galaxies in Comparisson with the Cosmic-Ray Driven Dynamo Model

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009rmxac..36..266o&link_type=abstract

Magnetic Fields in the Universe II: From Laboratory and Stars to the Primordial Universe - Supplementary CD (Eds. A. Esquivel, J

Astronomy and Astrophysics

Astronomy

1

Cosmic Rays, Galaxies: Magnetic Fields, Techniques: Numerical Simulations

Scientific paper

We construct maps of polarized synchrotron radio emission of a whole galaxy, based on local models of the cosmic ray (CR) driven dynamo. We perform numerical simulations of the dynamo in local Cartesian domains, with shear-periodic boundary conditions, placed at different galactocentric radii. Those local solutions are concatenated together to construct the synchrotron images of the whole galaxy. The main aim of the paper is to compare the model results with the observed radio continuum emission from nearly edge-on spiral galaxy. On the basis of the modeled magnetic structure the polarization maps at different viewing angles are prepared, using the distribution of cosmic-ray electrons obtained from numerical simulations. Finally, our maps are convolved with the given radiotelescope beam. We show that it is possible to reconstruct the extended magnetic halo structures of the edge-on galaxies (so called X-shaped structures). Moreover, we demonstrate that the values of the pitch angles of polarization vectors on the face-on maps are similar to the ones observed in real galaxies.

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