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Dark Matter Density in Disk Galaxies

Published online by Cambridge University Press:  01 June 2008

J. A. Sellwood
J. A. Sellwood*
Affiliation:
Dept. of Physics & Astronomy, Rutgers University136 Frelinghuysen Road, Piscataway, NJ 08855 email: [email protected]
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Abstract

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I show that the predicted densities of the inner dark matter halos in ΛCDM models of structure formation appear to be higher than estimates from real galaxies and constraints from dynamical friction on bars. This inconsistency would not be a problem for the ΛCDM model if physical processes that are omitted in the collisionless collapse simulations were able to reduce the dark matter density in the inner halos. I review the mechanisms proposed to achieve the needed density reduction.

Keywords

Stellar dynamicsgalaxies: halosdark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S254: The Galaxy Disk in Cosmological Context , June 2008 , pp. 73 - 84
Copyright
Copyright © International Astronomical Union 2009

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