Galaxy Formation at Cosmic Dawn: Insights from JWST
by
Open Area (4F-SW)
Tsung-Dao Lee Institute
Host: Dong Lai
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Abstract:
In this talk, I will discuss several puzzles uncovered by recent JWST observations and explore their implications for our understanding of early galaxy formation. I will first review the evolution of modern cosmological hydrodynamical simulations that can now resolve the multiphase interstellar medium. I will highlight two key outcomes from these simulations that show connections to many of the JWST puzzles: bursty star-formation histories and enhanced star-formation efficiency. Specifically, I will present insights into these two phenomena from the recent THESAN-ZOOM project, a campaign of radiation-hydrodynamic zoom-in simulations designed for high-redshift galaxies. JWST has brought us to a pivotal moment, offering an unprecedented opportunity to refine both our galaxy formation models and cosmological framework.
Biography:
Xuejian (Jacob) is a postdoctoral researcher at the Kavli Institute for Astrophysics and Space Research at Massachusetts Institute of Technology. Xuejian received the Bachelor’s degree from Peking University and the Ph.D. degree in Physics at the California Institute of Technology supervised by Prof. Philip Hopkins. His research interests are the formation and evolution of high-redshift galaxies and supermassive black holes in light of JWST observations, and the potential of using high-redshift observables constraining fundamental physics. He is also part of the FIRE and THESAN collaboration in developing novel cosmological radiation-hydrodynamic simulations of high-redshift galaxies.
