Cosmic-ray driven dynamo in galaxies

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dc.contributor.author Hanasz, Michał
dc.contributor.author Wóltański, Dominik
dc.contributor.author Kowalik, Kacper
dc.contributor.author Kotarba, Hanna
dc.date.accessioned 2012-12-19T09:06:11Z
dc.date.available 2012-12-19T09:06:11Z
dc.date.issued 2011-02-07
dc.identifier.uri http://repozytorium.umk.pl/handle/item/226
dc.description.abstract We present recent developments of 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.
dc.language.iso eng
dc.relation.uri http://arxiv.org/abs/1102.1300
dc.rights info:eu-repo/semantics/openAccess
dc.subject Astrophysics - Galaxy Astrophysics
dc.title Cosmic-ray driven dynamo in galaxies
dc.type info:eu-repo/semantics/article

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