Volume 486, Number 1, July IV 2008
|Page(s)||25 - 33|
|Section||Cosmology (including clusters of galaxies)|
|Published online||15 May 2008|
The impact of the dark matter-gas interaction on the collapse behavior of spherical symmetric systems
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany e-mail: [jklar;jpmuecket]@aip.de
Accepted: 4 April 2008
Context. If the gas in the evolving cosmic halos is dissipating energy (cooling), then the dark matter (DM) halo also undergoes a compactification because of the variation in the gravitational potential . This is well-known as adiabatic contraction (AC).
Aims. Complementary to the AC, we investigate the resulting dynamical behavior of the whole system if the backreaction of the AC of DM onto the gas is taken into account.
Methods. Also to achieve sufficient high resolution within the central halo region, we use a crude fluid approximation for the DM obeying the adiabatic contraction behavior. Furthermore, we restrict ourselves to spherical symmetry and vanishing angular momentum of the studied matter configurations. The computations are done using a first-order Godunov scheme.
Results. Our results show that the dynamical interaction between gas and DM may lead to significantly shorter collapse times. If the gas cools, the dynamical behavior of the whole system depends strongly on the shape of the initial density profile.
Conclusions. Our findings indicate that, for a certain mass range of halo configurations, the dynamical interaction between gas and DM might be important for the halo evolution so it must be taken into account.
Key words: cosmology: dark matter / Galaxy: formation
© ESO, 2008
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.