Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-12-14
Astronomy and Astrophysics
Astrophysics
6 pages, 5 figures, contribution to the proceedings of XIX Rencontres de Blois
Scientific paper
We summarize the method of mass modelling of galaxy clusters based on reproducing the dispersion and kurtosis of the projected velocity distribution of galaxies. The models are parametrized within the framework of the NFW density profile, characterized by the virial mass and concentration, together with the constant anisotropy of galaxy orbits. The use of velocity dispersion alone does not allow to constrain all the three parameters from kinematic data due to the mass-anisotropy degeneracy. The degeneracy is broken by introducing the fourth velocity moment, the kurtosis. We tested the method based on fitting both moments on mock data sets drawn from simulated dark matter haloes and showed it to reproduce reliably the properties of the haloes. The method has been applied to estimate the mass, concentration and anisotropy of more than 20 clusters which allowed us to confirm, for the first time using kinematic data, the mass-concentration relation found in N-body simulations.
Gottloeber Stefan
Lokas Ewa L.
Mamon Gary A.
Wojtak Radoslaw
No associations
LandOfFree
Mass modelling of galaxy clusters via velocity moments does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Mass modelling of galaxy clusters via velocity moments, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Mass modelling of galaxy clusters via velocity moments will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-662711