AST Colloquium - Galaxy Clusters
Galaxy Clusters: the Culmination of Structure Formation in the UniverseDr. Jack SayersResearch ProfessorCalTechAbstract:Galaxy clusters provide a window to study a range of astrophysical phenomena related to large-scale structure formation. I will present several of our recent and upcoming observational studies of these phenomena, including: direct and indirect measurements of coherent motions within the gaseous cluster atmosphere due to mergers and inefficient thermalization of slowly accreted material; the impact of active galactic nuclei and other baryonic processes on both local and global cluster properties; constraints on the three dimensional shapes of clusters that result from gravitational collapse; the development of new observational techniques for studying cluster thermodynamics; and the prospects for constraining dark energy and modified gravity with future large-scale velocity measurements using clusters.Speaker Bio:Dr. Jack Sayers earned his BS from the Colorado School of Mines in 2002 and his PhD from Caltech in 2007 with Sunil Golwala as his advisor. Dr. Sayers was a NASA NPP Postdoc at JPL 2008-2010, Caltech senior postdoc 2010-2016, Caltech Research Assistant Professor 2016-2019, and is now a Caltech Research Professor 2019-present. His work has largely focused on observational studies of galaxy clusters and the development of submm and mm-wave photometric imagers and related technologies.Intended Audience:Beginners, undergraduates, graduates, experts. Those with interest in the topic.
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