演講資訊

摘要：

The superb capabilities of the James Webb Space Telescope (JWST) have extended our view into the ultra-high-redshift universe (z>12). Among the numerous scientific discoveries enabled by JWST, early deep extragalactic observations have unexpectedly revealed an abundance of massive galaxies, posing significant challenges to conventional galaxy formation models and cosmological simulations. To address this cosmic puzzle, we employ well-established galaxy formation models in conjunction with state-of-the-art cosmological simulations to explore the physical mechanisms that enabled extremely rapid star formation in the early universe. We have investigated and quantified the impact of various sources of uncertainty, including a potentially evolving mass-to-light ratio driven by changes in a variety of underlying physical processes, as well as uncertainties associated with field-to-field variance and photometric redshifts.

I will present a series of recent results from semi-analytic and empirical models that shed light on the physical origins, properties, and star formation histories of the emerging ultra-high-redshift galaxy population. Leveraging the wealth of legacy Hubble observations and the growing JWST dataset, I will also discuss our plans to develop a world-leading theoretical framework for galaxy formation and a versatile synthetic observation pipeline. Together, these efforts will enable meaningful contributions to next-generation wide-field cosmological survey missions, including Roman, Euclid, PRIMA, and CASTOR.