Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999ptep.proc...84o&link_type=abstract
Plasma Turbulence and Energetic Particles in Astrophysics, Proceedings of the International Conference, Cracow (Poland), 5-10 Se
Astronomy and Astrophysics
Astrophysics
Scientific paper
The process of turbulent, galactic dynamo in the presence of gas flows in spiral arms and a bar is investigated numerically. The main goal of our study is to give a physical interpretation of magnetic structures observed in nearby galaxies. We analyze the influence of an enhanced turbulent diffusion in gaseous spirals and the effect of extended halo upon the magnetic field evolution. The solution of the dynamo equation is obtained with a help of a realistic and time dependent gas velocity, provided by the 3D N-body simulations of two-component self-gravitating disk (containing stars and molecular gas). The resultant magnetic structures are used to construct the modeled polarization maps to compare them directly with observations. The magnetic field patterns obtained from our simualtions possess following characteristic features, well known from polarization maps of real galaxies: local alignment of polarization maxima along spiral arms, regions of a polarized emission in interarm areas with magnetic pitch angles similar to those of gaseous spirals, magnetic arms going across the gaseous pattern, and the extended magnetic halo with large poloidal loops, needed to explain Faraday effects.
Detlef Elstner
Otmianiowska-Mazur Katarzyna
Soida Marian
Urbanik Marek
von Linden Susanne
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