Home

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

Repository of Nicolaus Copernicus University

Show simple item record

dc.contributor.author Hanasz, Michał
dc.contributor.author Wóltański, Dominik
dc.contributor.author Kowalik, Kacper
dc.date.accessioned 2012-12-19T09:06:12Z
dc.date.available 2012-12-19T09:06:12Z
dc.date.issued 2009-11-05
dc.identifier.citation Astrophysical Journal Letters 706 (2009) L155-L159
dc.identifier.other doi:10.1088/0004-637X/706/1/L155
dc.identifier.uri http://repozytorium.umk.pl/handle/item/233
dc.description.abstract We report first results of first global galactic-scale CR-MHD simulations of cosmic-ray-driven dynamo. We investigate the dynamics of magnetized interstellar medium (ISM), which is dynamically coupled with the cosmic-ray (CR) gas. 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. We conduct numerical simulations with the aid of a new parallel MHD code PIERNIK. We find that the initial magnetization of galactic disks by exploding magnetized stars forms a favourable conditions for the cosmic-ray-driven dynamo. 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. The resulting magnetic field structure in an evolved galaxy appears spiral in the face-on view and reveals the so called X-shaped structure in the edge-on view.
dc.language.iso eng
dc.relation.uri http://arxiv.org/abs/0907.4891
dc.rights info:eu-repo/semantics/openAccess
dc.subject Astrophysics - Galaxy Astrophysics
dc.title Global galactic dynamo driven by cosmic-rays and exploding magnetized stars
dc.type info:eu-repo/semantics/article


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search repository



Advanced Search

Browse

My Account

Statistics

Informations