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DGCE SIG Seminar

Diffuse Gas in Cosmic Ecosystems Science Interest Group

DATE

January 23, 2025

TIME

4:00 pm EST

COMMUNITY

DGCE SIG

TYPE

Seminar

Clouds all the way down — resolving small-scale structure in galaxy-scale simulations

Evan Schneider, Pittsburgh University

Star-forming galaxies are known to host multiphase outflows, many of which span many orders of magnitude in density and temperature and extend many kiloparsecs out into the circumgalactic medium (CGM). Along with this large range in phases comes a large range in physical scale — the largest structures may span kiloparsecs, while the smallest structures may be sub-parsec in size or less. Understanding the full range of cloud scales is essential in order to make accurate comparisons between simulations and observational data. To that end, in this talk I will discuss cloud-scale structure in outflows and the CGM in two contexts. First, I will present cloud structure in CGOLS, the best resolved simulations of starburst outflows to date. Second, I will discuss CloudFlex, a promising new parametric model that can step in where the resolution of hydrodynamic simulations falls short.

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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.