[Astro] Lunch Talk - 2/10/25

[Joseph Butler]

Hi all,

This week’s lunch talk will be given by Frazer Pearce, and will take place on Thursday 2nd October at 1pm in A113. Title and abstract below.

Title: The growth of giants: how brightest cluster galaxies form.

Abstract: The brightest cluster galaxy (BCG) and the surrounding intracluster light (ICL) together dominate the stellar content at the centres of galaxy clusters, but their physical distinction remains blurred. Using hydrodynamical simulations, we investigate the formation of the BCG and ICL components across a sample of massive clusters. First we achieve this via hindcasting, tracking the components we see at z=0 back through cosmic time. We then take what we learned from this process to implement forecasting, allowing us to dynamically split the BCG and ICL components at the current time.  Our results provide motivation for both observational and theoretical attempts to split the BCG from the ICL.

[Disclaimer: this title and abstract were not written by ChatGPT]

Thanks,
Joe
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