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Formation of dwarf galaxies and small-scale problems of CDM

Published online by Cambridge University Press:  01 August 2006

Oleg Y. Gnedin
Oleg Y. Gnedin*
Affiliation:
University of Michigan, Department of Astronomy, Ann Arbor, MI 48109-1042, [email protected]
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Abstract

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The concordance cosmological model based on cold dark matter makes definitive predictions for the growth of galaxies in the Universe, which are being actively studied using numerical simulations. These predictions appear to contradict the observations of dwarf galaxies. Dwarf dark matter halos are more numerous and have steeper central density profiles than the observed galaxies. The first of these small-scale problems, the “missing satellites problem”, can be resolved by accounting for the low efficiency of gas cooling and star formation in dwarf halos. A newly-discovered class of HyperVelocity Stars will soon allow us to test another generic prediction of CDM models, the triaxial shapes of dark matter halos. Measuring the proper motions of HVS will probe the gravitational potential out to 100 kpc and will constrain the axis ratios and the orientation of the Galactic halo.

Keywords

dark matter — Galaxy: halo — galaxies: dwarf — galaxies: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 385 - 388
Copyright
Copyright © International Astronomical Union 2007

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