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feat: magnification uncertainty map from posterior draws (LEGGOS Fig. 4) - #693
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magnification_fractional_error_2d_from gives the per-pixel fractional error of |mu| over a list of per-draw magnification maps; plot_magnification_uncertainty_2d maps it with the best-fit constant-mu contours and critical curves (LEGGOS II figure 4). Arc phase 8c (#692). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This was referenced Nov 2, 2026
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Downstream: PyAutoLabs/PyAutoLens#817 → PyAutoLabs/autolens_workspace#616. Merge in that order after this. |
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Summary
Closes #692 (cluster arc phase 8c). Maps the fractional error of the magnification at every image-plane pixel over a set of posterior draws, with the best-fit constant-magnification contours and critical curves on top — the magnification uncertainty map published with cluster lens models (LEGGOS II, arXiv:2606.20804, figure 4). The workspace's source science scripts already draw from the posterior (phase 7b); they now store each draw's magnification map and plot this.
API Changes
Two new public functions in
autogalaxy.plot:magnification_fractional_error_2d_fromandplot_magnification_uncertainty_2d.See full details below.
Test Plan
test_autogalaxyfull suite: 1475 passedimaging/source_science.py(100 draws): median sigma/|mu| 0.23% (|mu| 1-3), 0.50% (3-10), 2.0% (10-30), 8.8% (>30, on the critical curve) — consistent with the run's scalar errors (0.9-1.9%); map shows the low-error plane with a bright ring along the critical curveFull API Changes (for automation & release notes)
Added
autogalaxy.plot.magnification_fractional_error_2d_from(magnification_list, magnification_best) -> Array2D— half the 16th-84th percentile range of |mu| over the draws / |mu_best|; inf where mu_best = 0.autogalaxy.plot.plot_magnification_uncertainty_2d(magnification_list, magnification_best, grid, mass_obj=None, contour_levels=(2, 5, 10, 20, 50, 100), include_critical_curves=True, tangential_critical_curves=None, radial_critical_curves=None, vmin=0.0, vmax=None, title=..., colormap="default", output_path=None, output_filename="magnification_uncertainty_2d", output_format=None, ax=None)—vmax=Nonecaps at the 95th percentile.Generated by the PyAutoLabs agent workflow.
🤖 Generated with Claude Code