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Global simulations of a galactic dynamo driven by cosmic-rays and exploding magnetized stars

Published online by Cambridge University Press:  01 November 2008

Michał Hanasz
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, PL-87148 Piwnice/Toruń, Poland, mhanasz@astri.uni.torun.pl
Dominik Wóltański
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, PL-87148 Piwnice/Toruń, Poland, mhanasz@astri.uni.torun.pl
Kacper Kowalik
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, PL-87148 Piwnice/Toruń, Poland, mhanasz@astri.uni.torun.pl
Rafał Pawłaszek
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, PL-87148 Piwnice/Toruń, Poland, mhanasz@astri.uni.torun.pl
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Abstract

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We conduct global galactic–scale magnetohydrodynamical (MHD) simulations of the cosmic–ray driven dynamo. We assume that exploding stars deposit small–scale, randomly oriented, dipolar magnetic fields into the differentially rotating ISM, together with a portion of cosmic rays, accelerated in supernova shocks. Our simulations are performed with the aid of a new parallel MHD code PIERNIK. We demonstrate that dipolar magnetic fields supplied on small SN–remnant scales, can be amplified exponentially by the CR–driven dynamo to the present equipartition values, and transformed simultaneously to large galactic–scales by an inverse cascade promoted by resistive processes.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2009

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