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The dark matter density problem in massive disk galaxies

Published online by Cambridge University Press:  26 May 2016

Benjamin J. Weiner
Benjamin J. Weiner*
Affiliation:
UCO/Lick Observatory, University of California, Santa Cruz, Santa Cruz, CA 95064, USA

Abstract

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We discuss measurements of disk mass from non-circular streaming motions of gas in the barred galaxies NGC 3095 and NGC 4123. in these galaxies with strong shocks and non-circular motions, the inner regions must be disk-dominated to reproduce the shocks. This requires dark matter halos of low central density and low concentration, compared to LCDM halo predictions. in addition, the baryonic collapse to a disk should have compressed the halo and increased the dark matter density, which sharpens the disagreement. One possible resolution is a substantial amount of angular momentum transfer from disk to halo, but this is not particularly attractive nor elegant.

Type
Part 8: Bars
Information
Symposium - International Astronomical Union , Volume 220: Dark Matter in Galaxies , 2004 , pp. 265 - 270
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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