[Astro] Lunch Talk - 26/6/25

[Joseph Butler]

Hi all,

Reminder of this today at 1pm!

Joe


________________________________
From: Joseph Butler <ppxjb4 at exmail.nottingham.ac.uk>
Sent: Monday, June 23, 2025 10:06:28 AM
To: astro at nottingham.ac.uk <astro at nottingham.ac.uk>
Subject: Lunch Talk - 26/6/25

Hi everyone,

This week’s lunch talk will be given by Diego Pallero, who is visiting from Universidad Técnica Federico Santa María (USM), Chile. As usual, this will be at 1pm Thursday in A113. Title and abstract are below.

Title: The formation pathways of S0-galaxies: Upcoming science with SPLUS and CHANCES-4MOST

Abstract: One of the fundamental problems in modern astrophysics is understanding the environment's role in the galaxy's evolution. Many works, both theoretical and observational, have focused on this topic. Nevertheless, it is not clear yet which are the main physical mechanisms behind the quenching of star formation. We used state-of-the-art C-EAGLE hydrodynamical simulations to characterize the moment when galaxies quench their star formation and suffer morphological transformations. We find that > 70% of galaxies suffer strong drops in their SFR before they are accreted onto the clusters, regardless of the cluster mass. However, most galaxies get completely quenched once they fall into galaxy clusters, several Gyr after this processing event. The culprit behind this quenching is primarily ram-pressure stripping, produced at the outskirts of the first cluster in which galaxies reside. Additionally, when looking specifically at the population of S0 galaxies, we found that lenticular galaxies can be split into two distinctive populations: first, a dominant population of satellite galaxies inhabiting massive haloes with no mergers at z<2, and second, a population of central lenticular galaxies inhabiting less massive haloes with a mixed merging history. This work suggests that S0s, and quenched galaxies in general, are formed primarily via ram-pressure stripping. These results will be tested with current and upcoming multiwavelength observations from surveys such as S-PLUS, CHANCES/4MOST, LOFAR and Euclid, and give us key hints on what to look for when trying to understand the origin of lenticular galaxies.

Cheers,
Joe
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