2009A&A...498L..21K


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET13:53:33

2009A&A...498L..21K - Astronomy and Astrophysics, volume 498, L21-24 (2009/5-1)

Formation of gaseous arms in barred galaxies with dynamically important magnetic field: 3D MHD simulations.

KULESZA-ZYDZIK B., KULPA-DYBEL K., OTMIANOWSKA-MAZUR K., KOWAL G. and SOIDA M.

Abstract (from CDS):

We present results of three-dimensional nonlinear MHD simulations of a large-scale magnetic field and its evolution inside a barred galaxy with the back reaction of the magnetic field on the gas. The model does not consider the dynamo process. To compare our modeling results with observations, we construct maps of the high-frequency (Faraday-rotation-free) polarized radio emission on the basis of simulated magnetic fields. The model accounts for the effects of projection and the limited resolution of real observations. We performed 3D MHD numerical simulations of barred galaxies and polarization maps. The main result is that the modeled magnetic field configurations resemble maps of the polarized intensity observed in barred galaxies. They exhibit polarization vectors along the bar and arms forming coherent structures similar to the observed ones. In the paper, we also explain the previously unsolved issue of discrepancy between the velocity and magnetic field configurations in this type of galaxies. The dynamical influence of the bar causes gas to form spiral waves that travel outwards. Each gaseous spiral arm is accompanied by a magnetic counterpart, which separates and survives in the inter-arm region. Because of a strong compression, shear of non-axisymmetric bar flows and differential rotation, the total energy of modeled magnetic field grows constantly, while the azimuthal flux grows slightly until 0.05Gyr and then saturates.

Abstract Copyright:

Journal keyword(s): magnetohydrodynamics (MHD) - galaxies: ISM - galaxies: magnetic fields

CDS comments: Paragraph.3.3 NGC 1356 is a misprint for NGC 1365.

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1201 3
2 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1562 2
3 M 66 GiP 11 20 15.026 +12 59 28.64 9.85 9.65 8.92     ~ 1190 4

    Equat.    Gal    SGal    Ecl

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2021.03.08-13:53:33

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