2001A&A...380...55M


Query : 2001A&A...380...55M

2001A&A...380...55M - Astronomy and Astrophysics, volume 380, 55-71 (2001/12-2)

Magnetic fields in barred galaxies. II. Dynamo models.

MOSS D., SHUKUROV A., SOKOLOFF D., BECK R. and FLETCHER A.

Abstract (from CDS):

We study the generation and maintenance of large-scale magnetic fields in barred galaxies. We take a velocity field (with strong noncircular components) from a published gas dynamical simulation of Athanassoula (1992MNRAS.259..345A), and use this as input to a galactic dynamo calculation. Our work is largely motivated by recent high quality VLA radio observations of the barred galaxy NGC 1097, and we compare our results in detail with the regular magnetic fields deduced from these observations. We are able to reproduce most of the conspicuous large-scale features of the observed regular field, including the field structure in the central regions, by using a simple mean-field dynamo model in which the intensity of interstellar turbulence (more precisely, the turbulent diffusivity) is enhanced by a factor of 2-6 in the dust lanes and near the circumnuclear ring. We argue that magnetic fields can be dynamically important, and therefore should be included in models of gas flow in barred galaxies.

Abstract Copyright:

Journal keyword(s): magnetic fields - MHD - galaxies: spiral - galaxies: ISM - galaxies: magnetic fields - galaxies: individual: NGC 1097

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1259 3
2 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1647 2
3 NGC 1530 G 04 23 27.102 +75 17 44.05   13.40       ~ 265 1
4 NGC 3504 LIN 11 03 11.191 +27 58 20.77   13.48 12.93     ~ 504 2
5 IC 4214 G 13 17 42.6918273984 -32 06 06.103910340   12.15 11.65 10.72   ~ 110 0
6 NGC 5383 GiG 13 57 04.9709727768 +41 50 46.419238680   12.5   10.95   ~ 327 0

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2022.08.09-02:44:09

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