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Incorporating Cosmic Rays In Local And Global Models Of Disk-Halo Interaction

Published online by Cambridge University Press:  17 September 2012

M. Hanasz ,
K. Otmianowska-Mazur ,
H. Lesch ,
G. Kowal ,
M. Soida ,
D. Wóltański ,
K. Kowalik ,
R.K. Pawłaszek  and
B. Kulesza-Zydzik
M. Hanasz
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, Toruń, Poland. e-mail: mhanasz@astri.uni.torun.pl;
K. Otmianowska-Mazur
Affiliation:
Astronomical Observatory, Jagiellonian University, Kraków, Poland
H. Lesch
Affiliation:
Astronomical Observatory, Munich University, Munich, Germany
G. Kowal
Affiliation:
Astronomical Observatory, Jagiellonian University, Kraków, Poland Department of Physics and Astronomy, McMaster University, Hamilton, Canada
M. Soida
Affiliation:
Astronomical Observatory, Jagiellonian University, Kraków, Poland
D. Wóltański
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, Toruń, Poland. e-mail: mhanasz@astri.uni.torun.pl;
K. Kowalik
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, Toruń, Poland. e-mail: mhanasz@astri.uni.torun.pl;
R.K. Pawłaszek
Affiliation:
Centre for Astronomy, Nicholas Copernicus University, Toruń, Poland. e-mail: mhanasz@astri.uni.torun.pl;
B. Kulesza-Zydzik
Affiliation:
Astronomical Observatory, Jagiellonian University, Kraków, Poland
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Abstract

We present new developments on the cosmic-ray driven, galactic dynamo, modeled by means of direct, resistive CR–MHD simulations, performed with ZEUS and PIERNIK codes. The dynamo action, leading to the amplification of large–scale galactic magnetic-fields on galactic rotation timescales, appears as a result of galactic differential rotation, buoyancy of the cosmic-ray component and resistive dissipation of small–scale turbulent magnetic-fields. Our new results include demonstration of the global–galactic dynamo action driven by cosmic-rays supplied in supernova remnants. An essential outcome of the new series of global galactic dynamo models is the equipartition of the gas turbulent energy with magnetic-field energy and cosmic-ray energy, in saturated states of the dynamo on large galactic scales.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 56: The Role of the Disk-Halo Interaction in Galaxy Evolution: Outflow vs. Infall? , 2012 , pp. 347 - 354
Copyright
© EAS, EDP Sciences, 2012

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