[Astro] [CAPT] CAPT Weekly Bulletin (w/c 26-05-25)

[Ella Batchelor]

Tuesdays at 11am, CAPT Foyer – Astro Coffee



Tuesday 27th May at 11.30am, A113 CAPT – Astronomy Journal Club
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Wednesday 28th May at 3pm, B13 Physics – School Colloquium

Hannah Stern (Oxford)

A quantum coherent spin defect in hexagonal boron nitride for quantum technologies

Quantum networks and sensing require solid-state spin-photon interfaces that combine single-photon generation and long-lived spin coherence with scalable device integra􀀂on, ideally at ambient conditions. Despite rapid progress reported across several candidate systems, those possessing quantum coherent single spins at room temperature remain extremely rare. In this talk, I will show quantum coherent control under ambient conditions of a single-photon emitting defect in hexagonal boron nitride. I will show how this carbon-related defect has a spin-triplet electronic ground-state manifold. I will reveal that the spin coherence is governed predominantly by coupling to only a few proximal nuclei and is prolonged by decoupling protocols. Finally, I will show how these results open routes to explore this defect type for nanoscale magnetometry.

Refreshments in C10 to follow.
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Thursday 29th May at 1pm, A113 CAPT – Astronomy Lunch Talk

Jade Gray

A 13^CO Detection in a Jet-Driven Molecular Gas Flow


Galaxies undergo significant evolution from the early Universe to the present day; feedback processes are vital ingredients needed to help untangle the details of this transformation. Powerful jets driven by active galactic nuclei (AGN) have a key role in suppressing gas cooling, modulating the cooling gas that infalls into the host galaxy's centre. These radio jets inflate large bubbles, which displace the hot atmosphere and are visible as cavities in X-ray surface brightness. In the central galaxy of Abell 1795, the powerful radio source has inflated two large bubbles, North (N) and South (S) of the AGN. These filaments of molecular gas are exclusively projected around the bubble rims and their smooth velocity gradients imply the gas flows are entrained by the bubbles (Russell et al. 2017). The interplay of molecular gas flows, jets and jet-inflated radio bubbles in AGN feedback remains unknown. Russell et al. (2017) found that the energy required to lift the N filament (10^9 M☉) exceeds the N radio bubble's mechanical energy. This result was produced by assuming the Galactic value for the CO-to-H_2 conversion factor, α_CO,MW, to determine the filament's molecular mass. This talk describes how a detection of 13^CO in Abell 1795’s entrained flow, made by the Atacama Large Millimeter Array (ALMA), was used to measure α_CO and investigate if the mass was previously overestimated.


Thursday 29th May at 3pm, A113 CAPT – Particle Cosmology Journal 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 (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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