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DGCE SIG Seminar

Diffuse Gas in Cosmic Ecosystems Science Interest Group

DGCE SIG about DGCE SIG Seminar

Location

Virtual

Dates

25 September 2025
4:00pm ET

Community

DGCE SIG

Type

Seminar

Feedback and Expansion of Galactic Atmospheres

Speaker

Mark Voit, Michigan State University

Abstract

Galaxy evolution is governed by feedback mechanisms that seem to be self-regulating. In galaxy clusters, feedback heating appears to balance radiative cooling, but in smaller halos, the energy input from feedback exceeds radiative cooling and causes the atmospheres of those halos to expand. To measure the total amount of feedback energy input we therefore need to map the baryons associated with halos on scales larger than the virial radius, which is hard to do but essential for understanding how feedback energy regulates a galaxy's gas supply.

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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.