Model independent measurements of bar pattern speeds

Details Model independent measurements of bar pattern speeds Model independent measurements of bar pattern speeds

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.1318g&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #13.18; Bulletin of the American Astronomical Society, Vol. 34, p.1117

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Scientific paper

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 & 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. The results for all four galaxies are consistent with bars being fast rotators. The lack of slow bars 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.

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