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Hi Everyone,</div>
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For those of you who are around today, I just wanted to remind you of Anik's seminar at 15:45 in C4. Looking forward to seeing you in ~ 90 minutes!</div>
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Cheers,</div>
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Jesse </div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Astro <astro-bounces@lists.nottingham.ac.uk> on behalf of Jesse Golden-Marx (staff) <Jesse.Golden-Marx@nottingham.ac.uk><br>
<b>Sent:</b> Monday, May 18, 2026 10:18 AM<br>
<b>To:</b> capt@nottingham.ac.uk <capt@nottingham.ac.uk><br>
<b>Subject:</b> [Astro] [CAPT] Seminar this week: Anik Halder</font>
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Hi Everyone,</div>
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Our seminar this Wednesday will be given by Anik Halder, a postdoc at the institute of Astronomy at Cambridge. As usual, the seminar will be in C4 followed by wine and cheese. The abstract and title are provided below. </div>
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The timings are:</div>
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<div class="x_elementToProof" role="presentation" style="margin:0px">Lunch at the Portland building (leaving CAPT ~ 13:00) — we can subsidize a few postgraduate students to join for lunch, so please let me know by tomorrow morning. </div>
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<div class="x_elementToProof" role="presentation" style="margin:0px">Postgrads meet with the speaker at 15:00 - 15:30</div>
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<div class="x_elementToProof" role="presentation" style="margin:0px">Seminar in C4 at 15:45</div>
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<div class="x_elementToProof" role="presentation" style="margin:0px">Wine & Cheese at 16:45</div>
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If you would like to join for lunch or meet with Anik, please let me know by tomorrow evening! See you all on Wednesday!</div>
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Cheers,</div>
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Jesse, Luke, Tutku, & Jake</div>
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<span style="font-size:17px; background-color:rgb(255,255,255)">Title: Physical properties and redshift distributions of KiDS-1000 galaxies using the pop-cosmos galaxy population model</span><span style="font-size:12pt; background-color:rgb(255,255,255)"><br>
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</span><span style="font-size:17px; background-color:rgb(255,255,255)">Abstract: 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.</span></div>
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<b>Jesse Golden-Marx, Ph.D.</b></div>
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<b>Senior Research Associate</b></div>
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Centre for Astronomy & Particle Theory</div>
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School of Physics & Astronomy</div>
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University of Nottingham</div>
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University Park, Nottingham, UK</div>
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