[Astro] Lunch Talk - 12/6/25

[Joseph Butler]

Hi everyone,

This week’s lunch talk will be given by Adela, at 1pm Thursday in A113. Title and abstract are below.

Title: Measuring the Shape of ICL and Dark Matter Halos in Hydrangea and Horizon-AGN Simulations

Abstract: Intracluster light (ICL) has been proposed as a luminous tracer of dark matter (DM) in galaxy clusters, as these stars are not bound to any particular galaxy but are instead governed by the cluster’s gravitational potential. It has been found that the isophotal contours closely follow the mass distribution of clusters out to ~200kpc observationally and in simulations (Montes and Trujillo 2019, Alonso Asensio et al. 2020). In this talk, I will present a shape analysis of ICL and DM from the Hydrangea and Horizon-AGN simulations. The elliptical shapes and orientations of these components are calculated using the moment of inertia tensor, extending to radii of ~1Mpc, both in 2D projections and 3D. I will also explore how cluster properties, specifically halo mass and formation redshift, affect the shapes of ICL and DM.

Thanks,
Joe
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