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Cosmic ray driven dynamo in barred and ringed galaxies

Published online by Cambridge University Press:  08 June 2011

K. Kulpa-Dybeł ,
K. Otmianowska-Mazur ,
B. Kulesza-Żydzik ,
G. Kowal ,
D. Wóltański ,
M. Hanasz  and
K. Kowalik
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
B. Kulesza-Żydzik
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 Núcleo de Astrofsica Teorica, Universidade Cruzeiro do Sul-Rua Galvão Bueno 868, CEP 01506-000 São Paulo, Brazil
D. Wóltański
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, PL-87148 Piwnice/ToruńPoland
M. Hanasz
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, PL-87148 Piwnice/ToruńPoland
K. Kowalik
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, PL-87148 Piwnice/ToruńPoland
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Abstract

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We study the global evolution of the magnetic field and interstellar medium (ISM) of the barred and ringed galaxies in the presence of non-axisymmetric components of the potential, i.e. the bar and/or the oval perturbations. The magnetohydrodynamical dynamo is driven by cosmic rays (CR), which are continuously supplied to the disk by supernova (SN) remnants. Additionally, weak, dipolar and randomly oriented magnetic field is injected to the galactic disk during SN explosions. To compare our results directly with the observed properties of galaxies we construct realistic maps of high-frequency polarized radio emission. The main result is that CR driven dynamo can amplify weak magnetic fields up to few μG within few Gyr in barred and ringed galaxies. What is more, the modelled magnetic field configuration resembles maps of the polarized intensity observed in barred and ringed galaxies.

Keywords

galaxies: evolutionmagnetic fieldsISM: cosmic raysmethods: numerical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S274: Advances in Plasma Astrophysics , September 2010 , pp. 398 - 400
Copyright
Copyright © International Astronomical Union 2011

References

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