[Astro] Seminar 5/3: Dr. Jon Davies (Liverpool John Moores)

[Jesse Golden-Marx]

Hi Everyone,
      I'm still looking for some people (faculty, students, or postdocs) to join for lunch with our seminar speaker, Jon Davies, tomorrow.  We'll be going to Lakeside Arts at ~1pm.  If you're interested in joining, please let me know!

In peace,
Jesse
________________________________
From: Jesse Golden-Marx (staff)
Sent: Monday, March 3, 2025 1:38 PM
To: capt at nottingham.ac.uk <capt at nottingham.ac.uk>
Subject: Seminar 5/3: Dr. Jon Davies (Liverpool John Moores)

Hi Everyone,
      I just wanted to remind you all about this week's seminar with Dr. Jon Davies from Liverpool John Moores who will be telling us about his simulation research on the formation of Milky Way like galaxies (see title and abstract below).  Jon will be arriving in the later morning on Wednesday and then visiting the department on Thursday morning.  So, if you're interested in chatting with him while he's visiting, please let us know.

Following the seminar, we will have wine and cheese.

Timings are as usual:

- lunch at Lakeside, leaving CAPT ~13:00 (subsidized for a limited number of students -- let me know before the end of the day tomorrow)
- meet the speaker for postgrads at 15:00, finishing at 15:30
- seminar at 15:45 in C4
- post-seminar wine and cheese at 16:45

This seminar will be conducted in person only.

Cheers,
Jesse and Luke



Title: The origins of galaxy diversity in cosmological simulations



Abstract: In the latest generation of cosmological simulations, the properties of Milky Way-like galaxies are shaped by how they interact with the gas reservoirs in their host haloes - the circumgalactic medium (CGM). In my talk I will explore how the galaxies in these simulations transform the content and properties of their CGM through feedback, and in turn, how the properties of the CGM determine the future evolution of galaxies. In particular, I will focus on how the fates of Milky Way-like galaxies are set by the growth histories of their central supermassive black holes (SMBHs); the growth of an over-massive SMBH causes the majority of the CGM to be expelled by AGN feedback, preventing the “refuelling” of the galaxy and leading to quenching, whilst the growth of an under-massive SMBH allows star formation to continue. These differences in SMBH growth therefore play a crucial role in establishing the diversity of galaxy properties in haloes of similar mass in these simulations, and so I will devote the rest of my talk to exploring why these differences exist. I will present the results of several controlled galaxy formation experiments, performed with the EAGLE model using carefully modified initial conditions, that have given us new insight into how SMBH growth is shaped by the assembly history of the host galaxy and halo, and revealed the essential role that galaxy mergers play in producing the star formation bimodality in cosmological simulations.



Jesse Golden-Marx, Ph.D.
Senior Research Associate

Centre for Astronomy & Particle Theory
School of Physics & Astronomy
University of Nottingham
University Park, Nottingham, UK
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