Global three-dimensional MHD simulations of galactic gaseous disks

Hiromitsu Nishikori, Mami MacHida, Ryoji Matsumoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We present the results of global three dimensional magnetohydrodynamic simulations of galactic gaseous disks. For the gravitational potential we adopt a model of our galaxy including dark matter given by Miyamoto et al. (1980). The initial gas distribution is that of an equilibrium torus in the gravitational potential. We assume initially weak toroidal magnetic fields. As the magnetorotational instability develops the torus becomes turbulent and changes itself into a disk. Magnetic energy increases and saturates when B ∼ 1μG. The magnetic field is maintained for more than 2.0 × 109 yrs. Although magnetic fields inside the disk are turbulent, global mean azimuthal field appears. The direction of the mean azimuthal field changes with the height from the equatorial plane. We also present the results of global MHD simulations under non-axisymmetric bar potential.

Original languageEnglish
Title of host publicationMAGNETIC FIELDS IN THE UNIVERSE
Subtitle of host publicationFrom Laboratory and Stars to Primordial Structures
Pages786-791
Number of pages6
DOIs
Publication statusPublished - Sep 28 2005
Externally publishedYes
EventMAGNETIC FIELDS IN THE UNIVERSE: From Laboratory and Stars to Primordial Structures - Angra dos Reis, Brazil
Duration: Nov 28 2004Dec 3 2004

Publication series

NameAIP Conference Proceedings
Volume784
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Other

OtherMAGNETIC FIELDS IN THE UNIVERSE: From Laboratory and Stars to Primordial Structures
CountryBrazil
CityAngra dos Reis
Period11/28/0412/3/04

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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  • Cite this

    Nishikori, H., MacHida, M., & Matsumoto, R. (2005). Global three-dimensional MHD simulations of galactic gaseous disks. In MAGNETIC FIELDS IN THE UNIVERSE: From Laboratory and Stars to Primordial Structures (pp. 786-791). (AIP Conference Proceedings; Vol. 784). https://doi.org/10.1063/1.2077250