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DGCE SIG Seminar

Diffuse Gas in Cosmic Ecosystems Science Interest Group

DATE

Oct 31, 2024

TIME

4:00 pm EST

COMMUNITY

DGCE SIG

TYPE

Seminar

A New Generation of Galaxy Formation Models for Mock Observations of the Circumgalactic Medium

Harley Katz, The University of Chicago

Modelling the detailed physics of the circumgalactic and interstellar media have proved challenging for numerical models of galaxy formation due to the large dynamic range of scales involved, their multi-phase and often non-equilibrium nature, and complex physical processes involved. Connecting galaxy formation simulations with real observations represents a further challenge for both using data to constrain models of galaxy formation and to test observational models for inferring physical properties of real galaxies. Here I will introduce RAMSES-RTZ, a galaxy formation code that simultaneously models the detailed non-equilibrium chemistry of >100 primordial, metal, molecular, and dust species, coupled to on-the-fly radiation transfer which is ideal for forward-modelling emission and absorption observations of the CGM. I will discuss measurements of CGM metallicity, outflow rates, and non-equilibrium effects. Finally, I will introduce the MEGATRON simulations, a large-scale project designed to study the CGM of galaxies from cosmic dawn to cosmic noon.

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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.