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DGCE SIG Seminar

Diffuse Gas in Cosmic Ecosystems Science Interest Group

DATE

June 27, 2024

TIME

4:00 pm EST

COMMUNITY

DGCE SIG

TYPE

Seminar

Circumgalactic Chemistry: the Missing Physical Link Between Galaxies and Their Halo Gas

Fakhri Zahedy, University of North Texas

We now know that the typical galaxy is surrounded by a spatially extended circumgalactic medium (CGM) that serves as both its long-term fuel reservoir and garbage dump. While great progress has been made in understanding how galaxies grow and change, a self-consistent explanation for the physical origin of the CGM remains elusive. Understanding the physical conditions and chemistry of circumgalactic gas is essential in order to identify its origin and eventual fate. Using high-quality and high-resolution spectroscopy from space and ground, we can figure out the detailed chemical makeup of the CGM of individu-al galaxies. I will discuss the evidence for multitude physical origins of the CGM in different galaxy populations. I will end by discussing the prospects for future discoveries enabled by studying circumgalactic chemistry, using spatially resolved observations of the CGM ob-tained with the next generation of space and ground-based telescopes.

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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.