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DGCE SIG Seminar

Diffuse Gas in Cosmic Ecosystems Science Interest Group

DATE

Feb 22,2024

TIME

4:00 pm EST

COMMUNITY

DGCE SIG

TYPE

Seminar

On the Cosmic Ecosystem: Insights from the Multiphase Circumgalactic Medium

Zhijie Qu, University of Chicago

In the cosmic ecosystem, the circumgalactic medium (CGM) is a massive baryon reservoir of baryonic inflows and outflows, shaping galaxy formation and evolution. The rapid decline of star formation rate from the Cosmic Noon is crucial in defining present-day galaxy characteristics, yet its driving force remains uncertain. Characterizing and modeling the CGM provides new insights into understanding this fundamental transition in galaxy evolution. In this talk, I will review observational constraints on the multiphase CGM using multiwavelength probes. In particular, I will explore the spatial distributions of different phases, with a focus on addressing a fundamental question, do galaxies host all of their baryons within their halos? In addition, I will highlight the recent improvements in constraining the thermodynamic properties, which provide key insight into resolving the fate of gas in the CGM, either feeding galaxies, escaping, or being virialized and staying in halos for a long time.

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An illustration of Sun-like star HD 181327 and its surrounding debris disk. The star is at top right. It is surrounded by a far larger debris disk that forms an incomplete ellpitical path and is cut off at right. There’s a huge cavity between the star and the disk. The debris disk is shown in shades of light gray. Toward the top and left, there are finer, more discrete points in a range of sizes. The disk appears hazier and smokier at the bottom. The star is bright white at center, with a hazy blue region around it. The background of space is black. The label Artist's Concept appears at lower left.