[Astro] [CAPT] CAPT Weekly Bulletin (w/c 02-12-24)

[Ella Batchelor]

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

Benjamin Muntz

Exploration in the Swampland

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Tuesdays at 11am, CAPT Foyer – Astro Coffee


Tuesday 3rd December at 1pm, A113 CAPT – Particle Cosmology and Gravity Seminar

Emma Albertini (Imperial)

Gravity, scattering amplitudes
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Wednesday 4th December at 3.45pm, C4 Physics  – Astronomy Weekly Seminar

Francesco D’Eugenio (Kavli, Cambridge)
Feedback and quenching at high redshift through JADES and GA-NIFS



How galaxies stop forming new stars (quenching) is one of the major open problems in astrophysics.

Large spectroscopy survey at z~0-1 have enabled tremendous progress in this field, highlighting the role of AGN in queching massive galaxies.

But the advent of JWST is providing new and stringent constraints on the physical processes responsible for quenching, challenging our picture of galaxy formation and quenching.

I will start by presenting new results from JWST NIRSpec integral-field spectroscopy of massive, post-starburst galaxies at z~3-5, revealing stellar rotation, a gas-rich CGM, and ongoing AGN feedback. I will then move to lower-mass systems at higher redshifts (possible progenitors) showing evidence of ongoing AGN feedback. I will then discuss internal feedback mechanisms and the open questions about the transition between stochastic star-formation histories and long-term quenching.
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Thursday 5th December at 1pm, A113 CAPT – Astronomy Lunch Talk

Zoe Le Conte (Durham)

A JWST investigation into the bar fraction at high redshifts 𝑧 > 1



The presence of a stellar bar in a disc galaxy indicates that the galaxy hosts, in its main part, a dynamically settled disc and that bar-driven processes are taking place in shaping its evolution. Studying the cosmic evolution of the bar fraction in disc galaxies is therefore essential to understand galaxy evolution in general. Using the Hubble Space Telescope (HST), previous studies have found that the bar fraction significantly declines from the local Universe to redshifts near one. Using the James Webb Space Telescope (JWST) Cosmic Evolution Early Release Science Survey (CEERS) and the initial public observations for the Public Release Imaging for Extragalactic Research (PRIMER), we extend the studies of the bar fraction in disc galaxies to redshifts 1 ≤ 𝑧 ≤ 3, i.e., for the first time beyond redshift two. Our sample is present in the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS) on the Extended Groth Strip (EGS) and Ultra Deep Survey (UDS) HST observations. The sample was visually classified to find the fraction of bars in disc galaxies in two redshift bins, and our results showed the JWST bar fraction to be twice the bar fraction found using bluer HST filters. Specifically, we find that the bar fraction is about 18% at redshifts between one and two, and about 14% at redshifts between two and three. In an upcoming study, we are doubling the sample and extending it to redshift four. We will also evaluate the evolution of the bar length to understand if bars grow with cosmic time. Our results already show that bar-driven evolution commences at early cosmic times and that dynamically settled discs are already present at a lookback time of ∼ 11 Gyrs.



Thursday 5th December at 3pm, A113 CAPT – Particle Cosmology Journal Club
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Friday 6th December at 2pm, A113 CAPT – CAPT Coding Club

Fridays at 4pm, CAPT Foyer – CAPT Cakes
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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
Administrator

Working Hours: Mon-Fri, 8:15am – 4pm
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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