Cosmic Origins
Searching for answers about our universe and its origins

Diffuse Gas in Cosmic Ecosystems
Science Interest Group
(DGCE SIG)

Events: Seminar

New Constraints on Thermodynamic Profiles of the Outer Circumgalactic Medium



September 26, 2024 – 4:00pm ET / 1:00pm PT
Nicholas Battaglia, Cornell University

An exciting new window into the circumgalactic medium (CGM) has opened up with the recent observations of the thermal and kinetic Sunyaev-Zel’dovich (SZ) effects on galactic spatial scales. After introducing the SZ effects, I will present the ongoing efforts to extract these galaxy scales SZ signals in data from the Atacama Cosmology Telescope. I will show how these observations are currently being used to constrain important physical processes, like feedback, that govern galaxy formation. Additionally, I will present the puzzle these observations pose to state-of-the-art cosmological simulations. I will conclude by highlighting the expected rapid growth in such SZ observations over the next decade with the upcoming millimeter and sub-millimeter focused experiments, like the Simons Observatory, CCAT, and CMB-S4.


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