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Issue A&A
Volume 385, Number 3, April III 2002
Page(s) 816 - 846
Section Galactic structure and dynamics
DOI http://dx.doi.org/10.1051/0004-6361:20020080



A&A 385, 816-846 (2002)
DOI: 10.1051/0004-6361:20020080

High-resolution rotation curves of low surface brightness galaxies

W. J. G. de Blok1 and A. Bosma2

1  ATNF, CSIRO, PO Box 76, Epping NSW 1710, Australia
2  Observatoire de Marseille, 2 place Le Verrier, 13248 Marseille Cedex 4, France

(Received 18 July 2001 / Accepted 15 January 2002 )

Abstract
We present high-resolution rotation curves of a sample of 26 low surface brightness galaxies. From these curves we derive mass distributions using a variety of assumptions for the stellar mass-to-light ratio. We show that the predictions of current Cold Dark Matter models for the density profiles of dark matter halos are inconsistent with the observed curves. The latter indicate a core-dominated structure, rather than the theoretically preferred cuspy structure.


Key words: galaxies: structure -- galaxies: kinematics and dynamics -- galaxies: halos

Offprint request: W. J. G. de Blok, edeblok@atnf.csiro.au

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© ESO 2002


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