[Astro] [CAPT] CAPT Weekly Bulletin (w/c 02-06-25)

[Ella Batchelor]

Monday 2nd June at 1pm, A113 CAPT – Astronomy Lunch Talk

George Becker (UC Riverside)

Exploring the End of Reionization



Studying the epoch of reionization carries a high potential for discovering new things about the IGM and galaxies in the early Universe.  How those discoveries are made, however, depends partly on when reionization occurred.  Over the past few years, multiple lines of evidence have strongly indicated that reionization ended later than previously thought, between redshifts five and six.  This opens a number of observational opportunities, as well as challenges.  I will describe the evidence for late-ending reionization, discuss some of the new ways in this era is being explored observationally, and touch on some of the potential implications for the IGM, high-redshift galaxies, and cosmology.


Monday 2nd June at 3pm, A113 CAPT – Theoretical Physics Student Seminar

Thomas Martin

'The' QCD Phase Diagram
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Tuesdays at 11am, CAPT Foyer – Astro Coffee



Tuesday 3rd June at 11.30am, A113 CAPT – Astronomy Journal Club



Tuesday 3rd June at 1pm, A113 CAPT – Particle Cosmology and Gravity Seminar
Elisa Todarello

An overview of axion dark matter


In this overview talk, I will describe the mechanism through which QCD axions are produced in the early Universe. I will discuss the state-of-the-art simulations of topological defect decay. Finally, I will introduce possible present-day axion small scale structures: miniclusters and axion stars.


Link to join: https://teams.microsoft.com/l/meetup-join/19%3ameeting_OGM3OTk5NzQtZWEwZS00ZmUyLTk3MGUtZjFhY2M5OTU2MjI1%40thread.v2/0?context=%7b%22Tid%22%3a%2267bda7ee-fd80-41ef-ac91-358418290a1e%22%2c%22Oid%22%3a%22f3250584-4b5f-48fa-a897-08e77f2246b7%22%7d
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Wednesday 4th June at 3.45pm, A113 CAPT – Astronomy Weekly Seminar

Dr. Francesca Frankoudi (Durham)

The formation, evolution, and dark matter content of barred galaxies in LCDM


The advent of high resolution hydrodynamical cosmological simulations allows us to now study the internal dynamics of barred spiral galaxies -- such as our own Milky Way -- within the full ΛCDM cosmological context. I will present what we have learnt about the formation and evolution of barred galaxies by comparing cosmological simulations to observations of both the Milky Way and nearby spiral galaxies. In particular, I will address the "When?" and the "How?" of bar formation in ΛCDM, and discuss what this implies about our own Galaxy's formation history, as well as why some galaxies form bars and others don't. I will discuss how barred galaxies evolve throughout cosmic history, as well as the connection between bars and their host dark matter halos, which can help shed light on both the amount and the nature of dark matter.
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Thursday 5th June at 1pm, A113 CAPT – Astronomy Lunch Talk

Guillaume Hewitt

No hidden monsters: Probing recently-quenched galaxies for obscured AGN with JWST


This talk presents a mid-infrared study of recently-quenched galaxies with JWST, with the aim of searching for obscured AGN activity. We focus on the transition class of post-starburst galaxies (PSBs) which provide insight into the intermediate stage of galaxy evolution between star-forming and quiescent, a necessity for understanding what drives quenching and galaxy bimodality. For massive galaxies (M* > 10^10), quenching models frequently invoke AGN feedback, and PSBs often exhibit strong outflows, consistent with this scenario. However, recent studies of massive PSBs have found no evidence of excess AGN activity from their X-ray and optical properties. This lack of activity indicates either AGN are not the main quenching mechanism, are short-lived and do not linger into the PSB phase, or are heavily obscured. If dust obscured, the presence of AGN activity could still be detected through the infrared (IR) emission of this hot dust. To test this, we use a sample of ∼150 photometrically-selected PSBs within the PRIMER-UDS field at 0.5 < z < 3.0, and utilise the 7.7 μm and 18 μm JWST/MIRI photometry (as well as an additional eight NIRCam and three HST wavebands) to probe the IR dust emission of these galaxies. We find interesting differences between low and high-mass PSBs, and interestingly no excess dust emission within the high-mass galaxies. This indicates there are no hidden AGN, or indeed residual star-formation within these galaxies. I will discuss the implications of these results on the current understanding of what quenches massive galaxies at these redshifts.


Thursday 5th June at 3pm, A113 CAPT – Particle Cosmology Journal Club

Fridays at 4pm, CAPT Foyer – CAPT Cakes
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VISITORS
Prof. George Becker (University of California, Riverside) is visiting the Astronomy group from Monday 2nd – Wednesday 4th June.

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If you have any events/visitors you would like included in next week’s bulletin, please let me know.


Best wishes

Ella

Ella Batchelor (she/her)
Administrator

School of Physics & Astronomy

University of Nottingham
A112a Centre for Astronomy & Particle Theory
University Park
Nottingham, NG7 2RD

+44 (0) 115 74 86778 |  nottingham.ac.uk<http://nottingham.ac.uk/>

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