Cosmic-ray driven dynamo in the medium of irregular galaxy

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dc.contributor.author Siejkowski, Hubert
dc.contributor.author Soida, Marian
dc.contributor.author Otmianowska-Mazur, Katarzyna
dc.contributor.author Hanasz, Michał
dc.contributor.author Bomans, Dominik J.
dc.date.accessioned 2012-12-19T09:06:12Z
dc.date.available 2012-12-19T09:06:12Z
dc.date.issued 2009-01-12
dc.identifier.other doi:10.1017/S1743921309031317
dc.identifier.uri http://repozytorium.umk.pl/handle/item/234
dc.description.abstract We investigate the cosmic ray driven dynamo in the interstellar medium of irregular galaxy. The observations (Chyzy et al. 2000, 2003) show that the magnetic field in irregular galaxies is present and its value reaches the same level as in spiral galaxies. However the conditions in the medium of irregular galaxy are very unfavorable for amplification the magnetic field due to slow rotation and low shearing rate. In this work we present numerical model of the interstellar medium in irregular galaxies. The model includes magnetohydrodynamical dynamo driven by cosmic rays in the interstellar medium provided by random supernova explosions. We describe models characterized by different shear and rotation. We find that even slow galactic rotation with low shearing rate gives amplification of the magnetic field. Simulations have shown that high amount of the magnetic energy flow out off the simulation region becoming an efficient source of intergalactic magnetic fields.
dc.language.iso eng
dc.relation.uri http://arxiv.org/abs/0901.1566
dc.rights info:eu-repo/semantics/openAccess
dc.subject Astrophysics - High Energy Astrophysical Phenomena
dc.subject Astrophysics - Galaxy Astrophysics
dc.title Cosmic-ray driven dynamo in the medium of irregular galaxy
dc.type info:eu-repo/semantics/article

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