| Issue |
A&A
Volume 524, December 2010
|
|
|---|---|---|
| Article Number | A74 | |
| Number of page(s) | 4 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361/201015330 | |
| Published online | 24 November 2010 | |
An analytical approach to the dwarf galaxies cusp problem
1
IAG, Universidade de São Paulo, Rua do Matão 1226, Cidade
Universitária,
CEP 05508-900,
São Paulo,
SP,
Brazil
e-mail: rafael@astro.iag.usp.br
2
IPMU, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa
277-8583,
Japan
Received:
3
July
2010
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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