Séminaire/Seminar Galaxies |
| « Unveiling the Galactic Baryon Cycle: Inflows, Outflows and Fountains » |
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Yucheng Gut |
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Gas accretion and feedback are essential components of almost all models of galaxy evolution; in particular, feedback from massive stars is thought to reshape the structure of the interstellar medium and self-regulate star formation, leading to the observed tight relationship between star formation rate and galaxy mass. However, direct observational constraints on this feedback loop remain limited. To understand this process, it is necessary to investigate how mass, momentum, energy, and metals are transported between galaxies and their surrounding circumgalactic medium (CGM). In this talk, I will explore how studies of Mg?II emission at the Cosmic Noon and HI 21?cm emission in the local Universe shed light on the dynamics of neutral outflows and fountains. Meanwhile, deep Lya emission measurements at z?=?3–4 reveal the large-scale neutral hydrogen environment. Together, these observations point to a self-regulated baryon cycle, in which feedback-driven outflows inject mass and energy into the CGM, and gravitational forces recycle the CGM gas to fuel future star formation. I will highlight how these results inform our understanding of galaxy evolution, and I will discuss prospects for future observations that could further constrain this vital cycle.
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jeudi 19 juin 2025 - 11:30 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |