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Lens Model Accuracy in the Expected LSST Lensed AGN Sample

  • Authors: Padmavathi Venkatraman, Sydney Erickson, Phil Marshall, Martin Millon, Philip Holloway, Simon Birrer, Steven Dillmann, Xiangyu Huang, Sreevani Jaragula, Ralf Kaehler, Narayan Khadka, Grzegorz Madejski, Ayan Mitra, Kevil Reil, Aaron Roodman

Padmavathi Venkatraman et al 2026 The Astronomical Journal 172 .

  • Provider: AAS Journals

Caption: Figure 10.

Here we show the recovered cpdf p(ξkν), where we infer ν hierarchically. We start by showing the network 5 × 105 combinations of lensing parameters sampled from the interim prior (gray contours) (Section 3.2.1). We apply the network to our realistic constructed sample of OM10 lenses (green contours) (Section 2.1) realized as LSST images (fiducial) (Section 2.2) and infer a multivariate Gaussian posterior pdf of the lensing parameters from each image (Section 3.1). Then, we combine these posteriors in a hierarchical inference to learn the parameters characterizing the parent distribution they are sampled from (purple contours). We model the parent distribution as a Gaussian with a diagonal covariance matrix and thus infer the M (mean) and Σ (scatter) at the population level (Section 3.3).

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