Speaker
Description
Studying massive, relaxed galaxy clusters at high redshifts is key to understand the theoretical and numerical models of structure formation and evolution on cosmological time scales. An attempt is made to study the relaxed state of MACS J1423.8+2404 (z = 0.54, MACS J1423) using gravitational lensing. The MAssive Cluster Survey (MACS, Ebeling et al. 2001) is a compilation of very X-ray luminous 124 galaxy clusters at 0.3 < z < 0.7, including 12 clusters at z > 0.5 in the high redshift subsample (Ebeling et al. 2007). MACSJ 1423 is the most dynamically relaxed and the most massive cool-core cluster known at these redshifts. A model of MACS J1423 mass distribution is derived using strong-lensing constraints, i.e. multiple images in the cluster core which will be combined with weak-lensing measurements of gravitational shear on larger scales. I will present the methods used and the results of the derived projected mass of MACS J1423. I will also put my results in perspective of other lensing and multi-wavelength analyses (Limousin et al. 2010, Zitrin et al. 2011), to derive constraints on cluster evolution.
| Category | Particle / Astroparticle / Cosmology (Experiment) |
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