Cosmological Constraints from Clusters Discovered by the South Pole Telescope
Lindsey Bleem (Argonne National Lab)
May 31, 2018
Abstract: The South Pole Telescope (SPT), a 10-meter millimeter-wavelength telescope located at the geographic South Pole, has been used to conduct several wide-area surveys including the 2500-square-degree SPT-SZ survey, and the 500-square- degree SPTpol Survey (which reached depths of 5.3 uK-arcmin at 150 GHz, ~3x deeper than SPT-SZ), and the new 2500-square-degree SPTpol Extended Cluster Survey to the north of the SPT-SZ footprint. One of the primary objectives of these wide-area SPT surveys was the construction of mass-limited samples of galaxy clusters identified via the thermal Sunyaev- Zel”dovich (SZ) effect. The abundance of such clusters is a powerful cosmological probe as it depends sensitively upon both the expansion history of the universe and the growth of density fluctuations. In this talk I will discuss progress analyzing these three datasets including updated cosmological constraints from the initial SPT- SZ cluster sample using new weak lensing data as well as ongoing work from a new project characterizing the strong lensing properties of these systems. The results presented in this talk will be significantly improved with data from the new SPT-3G survey—deployed in January 2017—that will identify an order of magnitude more clusters than previous generation SZ surveys.