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Interstellar and intergalactic dynamos

Published online by Cambridge University Press:  18 July 2013

M. Hanasz ,
D. Woltanski  and
K. Kowalik
M. Hanasz
Affiliation:
Centre for Astronomy, Nicolaus Copernicus University, Faculty of Physics, Astronomy and Informatics, ul. Grudziadzka 5, PL-87-100 Torun, Poland, *E-mail: mhanasz@astri.uni.torun.pl
D. Woltanski
Affiliation:
Centre for Astronomy, Nicolaus Copernicus University, Faculty of Physics, Astronomy and Informatics, ul. Grudziadzka 5, PL-87-100 Torun, Poland, *E-mail: mhanasz@astri.uni.torun.pl
K. Kowalik
Affiliation:
Centre for Astronomy, Nicolaus Copernicus University, Faculty of Physics, Astronomy and Informatics, ul. Grudziadzka 5, PL-87-100 Torun, Poland, *E-mail: mhanasz@astri.uni.torun.pl
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Abstract

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We review recent developments of amplification models of galactic and intergalactic magnetic field. The most popular scenarios involve variety of physical mechanisms, including turbulence generation on a wide range of physical scales, effects of supernovae, buoyancy as well as the magnetorotational instability. Other models rely on galaxy interaction, which generate galactic and intergalactic magnetic fields during galaxy mergers. We present also global galactic-scale numerical models of the Cosmic Ray (CR) driven dynamo, which was originally proposed by Parker (1992). We conduct a series of direct CR+MHD numerical simulations of the dynamics of the interstellar medium (ISM), composed of gas, magnetic fields and CR components. We take into account CRs accelerated in randomly distributed supernova (SN) remnants, and assume that SNe deposit small-scale, randomly oriented, dipolar magnetic fields into the ISM. The amplification timescale of the large-scale magnetic field resulting from the CR-driven dynamo is comparable to the galactic rotation period. The process efficiently converts small-scale magnetic fields of SN-remnants into galactic-scale magnetic fields. The resulting magnetic field structure resembles the X-shaped magnetic fields observed in edge-on galaxies.

Keywords

Galaxies: ISMMagnetic FieldsISM: Cosmic RaysMagnetic FieldsMHD: Dynamos
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S294: Solar and Astrophysical Dynamos and Magnetic Activity , August 2012 , pp. 225 - 236
Copyright
Copyright © International Astronomical Union 2013 

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