|
|
Summary of a journal-club
| Date
| Subject
| Presented by
|
|---|
| 24 january 2013
| The mass and velocity anisotropy profile of Abell 2142
Abell 2142 is a nearby cluster with one of the largest available
spectroscopic data-set, comparable to the well known Coma
cluster. Hence, it is one of the best observational target for the
determination of a cluster mass and velocity anisotropy profile. For
this I apply different techniques, all based on the projected
phase-space distribution of galaxies in the cluster region:
Dispersion+Kurtosis (Lokas & Mamon 2001), MAMPOSSt (Mamon et al. 2013)
and Caustic (Diaferio & Geller 1997). I combine the different mass
profile determinations, along with those obtained in the literature
based on X-ray and weak lensing observations, to define a concordance
mass profile for the cluster. I then use this mass profile to compute
the velocity anisotropy profile, which is related to the shape of
galaxy orbits in the cluster, and can be used to constrain formation
scenarios of cosmological halos. I finally compare the velocity
anisotropy profile of Abell 2142 to those of cosmological halos of
similar mass in numerical N-body SPH simulations.
| Emiliano Munari
Univ. Trieste, Italie
|
|---|
Image : D1 Deep Field from the Legacy Survey of the Canada-France-Hawaï Telescope (CFHTLS)
TERAPIX Data Processing Center (CNRS/INSU - IAP - CEA)
|
