Data: 28.07.2016

Palestrante: Dr. Lindsay Bleem (Argonne National Laboratory)

Link: https://youtu.be/5qNUO_ajZbI

Resumo: Galaxy clusters are powerful tools with which to constrain cosmological models as their abundance depends upon both the expansion history of the universe and the growth of density fluctuations. In this talk, I will describe the ongoing program by the South Pole Telescope collaboration to test such models using a sample of massive clusters identified in the SPT-SZ survey. One of the primary objectives of this 2500-square-degree mm-wavelength survey was the construction of a mass-limited sample of galaxy clusters identified via the thermal Sunyaev- Zel’dovich (SZ) effect (through which clusters imprint small temperature distortions on the cosmic microwave background). I will describe the galaxy cluster sample, efforts to improve understanding of the mass-calibration of cluster observables, as well as our newly-published cosmological constraints. Finally, there is a wealth of information that can be extracted from analyses of clusters using multi-wavelength data such as from the SPT and the optical-wavelength Dark Energy Survey. I will highlight several such ongoing projects.