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The ratio of pattern speeds in double-barred galaxies
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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2014 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 444, no 1, l85-L89 p.Article in journal (Refereed) Published
Abstract [en]

We have obtained two-dimensional velocity fields in the ionized gas of a set of eight double-barred galaxies, at high spatial and spectral resolution, using their H alpha emission fields measured with a scanning Fabry-Perot spectrometer. Using the technique by which phase reversals in the non-circular motion indicate a radius of corotation, taking advantage of the high angular and velocity resolution, we have obtained the corotation radii and the pattern speeds of both the major bar and the small central bar in each of the galaxies; there are few such measurements in the literature. Our results show that the inner bar rotates more rapidly than the outer bar by a factor between 3.3 and 3.6.

Place, publisher, year, edition, pages
2014. Vol. 444, no 1, l85-L89 p.
Keyword [en]
Galaxies: evolution, Galaxies: kinematics and dynamics, Galaxies: structure
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:su:diva-110197DOI: 10.1093/mnrasl/slu120ISI: 000344181600017OAI: oai:DiVA.org:su-110197DiVA: diva2:769993
Note

AuthorCount:6;

Available from: 2014-12-09 Created: 2014-12-08 Last updated: 2017-12-05Bibliographically approved

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Fathi, Kambiz
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