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Oxford University Press, Monthly Notices of the Royal Astronomical Society, 1(345), p. 261-268, 2003

DOI: 10.1046/j.1365-8711.2003.06937.x

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Model-independent measurements of bar pattern speeds

Journal article published in 2003 by Joris Gerssen, Konrad Kuijken ORCID, Michael R. Merrifield ORCID,
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The pattern speed in one of the fundamental parameters that determines the structure of barred galaxies. This quantity is usually derived from indirect methods or by employing model assumptions. The number of bar pattern speeds derived using the model independent Tremaine and Weinberg technique is still very limited. We present the results of model independent measurements of the bar pattern speed in four galaxies ranging in Hubble type from SB0 to SBbc. Three of the four galaxies in our sample are consistent with bars being fast rotators. The lack of slow bars is consistent with previous observations and suggests that barred galaxies do not have centrally concentrated dark matter halos. This contradicts simulations of cosmological structure formation and observations of the central mass concentration in nonbarred galaxies. ; Comment: 20 pages, LaTeX, 5 Postscript figures, accepted for publication in MNRAS