Fourier coherence length between lensing mass and X-ray gas maps diagnoses cluster dynamical state, classifying only 16% as relaxed under a strict threshold and showing 24% disagreement with earlier classifications.
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Excessive external shear in ellipsoidal lens models of quadruply-lensed quasar NLRs always resolves position anomalies and reduces flux-ratio anomalies, concealing signals commonly attributed to dark-matter substructure.
Galaxy clusters have an average projected ellipticity of 0.310 with axis ratio 0.527, showing no significant mass or redshift dependence, measured via weak lensing on DES Y3 data and verified with mocks.
A masked and initialized variant of Kaiser-Squires weak lensing inversion recovers cluster mass maps with residuals below 0.02 sigma in unmasked nonlinear regions on simulated data without shape noise.
citing papers explorer
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Lensing-Reconstructed Dark Matter-Intracluster Medium Coherence as a Probe of Cluster Dynamical State: Application to HSTFF, RELICS, and CLASH Clusters
Fourier coherence length between lensing mass and X-ray gas maps diagnoses cluster dynamical state, classifying only 16% as relaxed under a strict threshold and showing 24% disagreement with earlier classifications.
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The Subversive Role of Excessive External Shear in Concealing Lensing Anomalies
Excessive external shear in ellipsoidal lens models of quadruply-lensed quasar NLRs always resolves position anomalies and reduces flux-ratio anomalies, concealing signals commonly attributed to dark-matter substructure.
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Constraining Galaxy Cluster Triaxiality via Weak Lensing -- I. Preparation for the Rubin Data Beyond Leading Order
Galaxy clusters have an average projected ellipticity of 0.310 with axis ratio 0.527, showing no significant mass or redshift dependence, measured via weak lensing on DES Y3 data and verified with mocks.
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Nonlinear Weak Lensing reconstruction for Galaxy Clusters
A masked and initialized variant of Kaiser-Squires weak lensing inversion recovers cluster mass maps with residuals below 0.02 sigma in unmasked nonlinear regions on simulated data without shape noise.