[Astro] [CAPT] CAPT Weekly Bulletin (w/c 18-05-26)

[Ella Batchelor (staff)]

Monday 18th May at 3pm, A113 CAPT – Theoretical Physics Student Seminar

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Tuesdays at 11am, CAPT Foyer – Astro Coffee

Tuesdays at 11.30am, A113 CAPT – Astronomy Journal Club



Tuesday 19th May at 1pm, C12 Physics – Particle Cosmology and Gravity Seminar

Graham A. White (Southampton)



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 20th May at 3.45pm, C4 Physics – Astronomy Weekly Seminar

Dr Anik Halder (Cambridge)

Physical properties and redshift distributions of KiDS-1000 galaxies using the pop-cosmos galaxy population model



Accurate redshift calibration and physically motivated source sample selection are central challenges for precision weak lensing cosmology. In this talk, I will present our recent work on forward modelling redshift distributions and inferring physical properties of weak lensing galaxies in the Kilo-Degree Survey (KiDS-1000) using a generative model for the galaxy population. The framework enabling this work is pop-cosmos, a calibrated galaxy population model that allows principled Bayesian inference of individual galaxy redshifts and physical properties for millions of KiDS-1000 sources. Validation against spectroscopic samples demonstrates low bias and scatter in the inferred photometric redshifts, while physical property inference enables the construction of weak lensing catalogues that mitigate intrinsic alignment systematics. We also develop a forward-modelling framework to infer the redshift distributions of the KiDS-1000 galaxies. By applying a KiDS data and survey selection model to synthetic photometric data of mock pop-cosmos galaxies, we directly characterize the redshift distributions in each of the five tomographic bins of KiDS-1000, thereby bypassing the need for spectroscopic reweighting used in conventional redshift calibration methods. Overall, our results demonstrate how the pop-cosmos galaxy population model can deliver accurate redshift distributions as well as galaxy properties, crucial for connecting galaxy evolution physics and weak lensing cosmology.

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Thursday 21st May at 1pm, A113 CAPT – Astronomy Lunch Talk

Emma Chapman



Thursday 21st May at 6pm, B1 Physics – Science Public Lecture

Helen Russell

Black Hole Feedback



Thursdays at 3pm, A113 CAPT – Particle Cosmology Journal Club

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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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