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3D MHD simulations of magnetic fields and radio polarization of barred galaxies

Published online by Cambridge University Press:  01 November 2008

B. Kulesza-Żydzik ,
K. Kulpa-Dybeł ,
K. Otmianowska-Mazur ,
G. Kowal  and
M. Soida
B. Kulesza-Żydzik
Affiliation:
Astronomical Observatory, Jagiellonian University, ul Orla 171, 30-244 Kraków, Poland
K. Kulpa-Dybeł
Affiliation:
Astronomical Observatory, Jagiellonian University, ul Orla 171, 30-244 Kraków, Poland
K. Otmianowska-Mazur
Affiliation:
Astronomical Observatory, Jagiellonian University, ul Orla 171, 30-244 Kraków, Poland
G. Kowal
Affiliation:
Astronomical Observatory, Jagiellonian University, ul Orla 171, 30-244 Kraków, Poland Department of Astronomy, University of Wisconsin, 475 North Charter Street, Madison, WI 53706, USA
M. Soida
Affiliation:
Astronomical Observatory, Jagiellonian University, ul Orla 171, 30-244 Kraków, Poland
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Abstract

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We present results of three-dimensional, fully nonlinear MHD simulations of a large-scale magnetic field evolution in a barred galaxy. The model does not take into consideration the dynamo process. We find that the obtained magnetic field configurations are highly similar to the observed maps of the polarized intensity of barred galaxies, because the modeled vectors form coherent structures along the bar and spiral arms. Due to the dynamical influence of the bar the gas forms spiral waves which go radially outward. Each spiral arm forms the magnetic arm which stays much longer in the disk, than the gaseous spiral structure. Additionally the modeled total energy of magnetic field grows due to strong compression and shear of non-axisymmetrical bar flows and differential rotation, respectively.

Keywords

MHD – numerical simulations – barred galaxies – magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S259: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies , November 2008 , pp. 553 - 554
Copyright
Copyright © International Astronomical Union 2009

References

Beck, R., Fletcher, A., Shukurov, A., Snodin, A., Sokoloff, D. D., Ehle, M., Moss, D., & Shoutenkov, V. 2005, A&A 444, 739Google Scholar
Ferrers, N. M. 1877, Quart. J. Pure Appl. Math. 14, 1Google Scholar
Otmianowska-Mazur, K., Elstner, D., Soida, M., & Urbanik, M. 2002, A&A 384, 48Google Scholar