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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 ,
Dominik Wóltański ,
Kacper Kowalik  and
Rafał Pawłaszek
Michał Hanasz
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, PL-87148 Piwnice/Toruń, Poland, [email protected]
Dominik Wóltański
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, PL-87148 Piwnice/Toruń, Poland, [email protected]
Kacper Kowalik
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, PL-87148 Piwnice/Toruń, Poland, [email protected]
Rafał Pawłaszek
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, PL-87148 Piwnice/Toruń, Poland, [email protected]
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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.

Keywords

Galaxies: ISM – magnetic fields – ISM: cosmic rays – magnetic fields – MHD
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. 549 - 550
Copyright
Copyright © International Astronomical Union 2009

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