Insights into the Epoch of Reionization from galaxies in the first billion years

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• Dr. Lily Whitler (Kavli Institute for Cosmology)
• Tuesday 18 November 2025, 11:15-12:00
• Coffee area, Battcock Centre.

If you have a question about this talk, please contact Charles Walker.

With the advent of JWST , an unexpectedly large abundance of luminous galaxies at unexpectedly high redshifts has been discovered, potentially pointing to previously unknown factors governing early star formation. Simultaneously, deep JWST spectroscopy probing the rest-frame UV emission of reionization-era galaxies has been providing new constraints on the timeline and topology of reionization, enabling insights into how early galaxies drove the reionization process. In this talk, I will present the UV luminosity function at z=9-15 derived from several hundred galaxies identified in 160 square arcminutes of deep NIR Cam imaging, and discuss implications for early star formation, the reionization timeline, and early growth of ionized bubbles. I will then discuss these results in context with new insights into the properties of ionized bubbles at z=9 obtained from JWST constraints on Lyα emission, demonstrating the power of simultaneously understanding reionization and the properties of the earliest galaxies.

This talk is part of the Hills Coffee Talks series.

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• Coffee area, Battcock Centre
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