Model-independent measurements of bar pattern speeds

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

2003-08-27

arxiv.org/abs/astro-ph/0308491v1

Mon.Not.Roy.Astron.Soc.345:261,2003

Astronomy and Astrophysics

Astrophysics

20 pages, LaTeX, 5 Postscript figures, accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06937.x

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.

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