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Cosmic Ecosystems

July 28, 2025 to August 1, 2025
Perimeter Institute for Theoretical Physics
America/Toronto timezone

Perimeter Institute

The Kinematics of the Hot and X-ray Emitting Circumgalactic Medium: Predictions from Simulations

Jul 29, 2025, 3:55 PM
10m
PI/1-100 - Theatre (Perimeter Institute for Theoretical Physics)

PI/1-100 - Theatre

Perimeter Institute for Theoretical Physics

190
Contributed Talk

Speaker

John ZuHone (Center for Astrophysics | Harvard & Smithsonian)

Description

In massive galaxies a significant fraction by mass of the circumgalactic medium is expected to be in the hot, X-ray emitting phase. Little is known about this gas since it is faint and is outshone by the Milky Way's own hot circumgalactic medium, and X-ray observatories with CCDs are unable to distinguish the emission lines of the former from the latter. Future observatories with X-ray IFUs would be able to measure key emission lines of the hot CGM, and use them to map the velocity structure of this phase. In this talk, I will show predictions from galaxies from a range of cosmological simulations for the velocity field of the hot CGM, showing signatures of rotation, inflows, and outflows from AGN and SNe feedback. Crucially, the velocity structure depends on the feedback model used, so that future observations may be used to constrain models used in cosmological simulations.

Authors

John ZuHone (Center for Astrophysics | Harvard & Smithsonian) Emily Silich (California Institute of Technology) Gerrit Schellenberger (Center for Astrophysics | Harvard & Smithsonian) Anna Ogorzałek (NASA/Goddard Space Flight Center) Ákos Bogdán (Center for Astrophysics | Harvard & Smithsonian) Benjamin Oppenheimer (University of Colorado--Boulder)

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External references