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Some Systematic Properties of Rotation Curves

Published online by Cambridge University Press:  19 May 2006

G.A. Mamon ,
F. Combes ,
C. Deffayet ,
B. Fort  and
S. McGaugh
S. McGaugh*
Affiliation:
Department of Astronomy, University of Maryland, College Park, MD, USA
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Abstract

The rotation curves of spiral galaxies obey strong scaling relations.These include the Tully-Fisher and baryonic Tully-Fisher relations, and themass discrepancy–acceleration relation.These relations can be used to place constraints on the mass-to-lightratios of stars. Once the stellar mass is constrained, the distribution ofdark matter follows. The shape of the dark matter distribution is consistentwith the expectations of NFW halos exterior to 1 kpc, but the amplitudeis wrong. This is presumably related to the long-standing problemof the normalization of the Tully-Fisher relation and may imply a downturn in the amplitude of the power spectrum at small scales. More fundamentally, the persistent success of MOND remains a troubling fact.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 20: Mass Profiles and Shapes of Cosmological Structures , 2006 , pp. 69 - 76
Copyright
© EAS, EDP Sciences, 2006

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