Volume 524, December 2010
|Number of page(s)||4|
|Published online||24 November 2010|
An analytical approach to the dwarf galaxies cusp problem
IAG, Universidade de São Paulo, Rua do Matão 1226, Cidade
2 IPMU, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa 277-8583, Japan
Accepted: 24 September 2010
Aims. An analytical solution for the discrepancy between observed core-like profiles and predicted cusp profiles in dark matter halos is studied.
Methods. We calculate the distribution function for Navarro-Frenk-White halos and extract energy from the distribution, taking into account the effects of baryonic physics processes.
Results. We show with a simple argument that we can reproduce the evolution of a cusp to a flat density profile by a decrease of the initial potential energy.
Key words: Galaxy: formation / galaxies: dwarf / large scale structure of Universe
© ESO, 2010
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