Magnetic Fields in Barred Galaxies. I. The Atlas

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dc.contributor.author Beck, R
dc.contributor.author Shoutenkov, V
dc.contributor.author Ehle, M
dc.contributor.author Harnett, JI
dc.contributor.author Haynes, RF
dc.contributor.author Shukurov, A
dc.contributor.author Sokoloff, DD
dc.contributor.author Thierbach, M
dc.date.accessioned 2009-06-26T04:10:35Z
dc.date.issued 2002-01
dc.identifier.citation Astronomy and Astrophysics, 2002, 391 (NA), pp. 83 - 102
dc.identifier.issn 0004-6361
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/500
dc.description.abstract The total and polarized radio continuum emission of 20 barred galaxies was observed with the Very Large Array (VLA) at $\lambda$3, 6, 18 and 22 cm and with the Australia Telescope Compact Array (ATCA) at $\lambda$6 cm and 13 cm. Maps at 30´´ angular resolution are presented here. Polarized emission (and therefore a large-scale regular magnetic field) was detected in 17 galaxies. Most galaxies of our sample are similar to non-barred galaxies with respect to the radio/far-infrared flux correlation and equipartition strength of the total magnetic field. Galaxies with highly elongated bars are not always radio-bright. We discuss the correlation of radio properties with the aspect ratio of the bar and other measures of the bar strength. We introduce a new measure of the bar strength, $\Lambda$, related to the quadrupole moment of the bar's gravitational potential. The radio surface brightness I of the barred galaxies in our sample is correlated with $\Lambda$, $I\propto\Lambda^{0.4\pm0.1}$, and thus is highest in galaxies with a long bar where the velocity field is distorted by the bar over a large fraction of the disc. In these galaxies, the pattern of the regular field is significantly different from that in non-barred galaxies. In particular, field enhancements occur upstream of the dust lanes where the field lines are oriented at large angles to the bar's major axis. Polarized radio emission seems to be a good indicator of large-scale non-axisymmetric motions.
dc.publisher EDP Sciences
dc.relation.isbasedon 10.1051/0004-6361:20020642
dc.subject atlases -- galaxies: magnetic fields -- galaxies: spiral -- galaxies: structure -- ISM: magnetic fields, Astronomy & Astrophysics
dc.subject atlases -- galaxies: magnetic fields -- galaxies: spiral -- galaxies: structure -- ISM: magnetic fields; Astronomy & Astrophysics
dc.title Magnetic Fields in Barred Galaxies. I. The Atlas
dc.type Journal Article
dc.parent Astronomy and Astrophysics
dc.journal.volume NA
dc.journal.volume 391
dc.journal.number en_US
dc.publocation Les Ulis, France en_US
dc.identifier.startpage 83 en_US
dc.identifier.endpage 102 en_US
dc.cauo.name Information and Communication en_US
dc.description.keywords atlases -- galaxies: magnetic fields -- galaxies: spiral -- galaxies: structure -- ISM: magnetic fields
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group /University of Technology Sydney/Faculty of Engineering and Information Technology/School of Computing and Communications


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