A Multi-Resolution Weak Lensing Mass Reconstruction Method

Abstract

Motivated by the limitations encountered with the commonly used direct reconstruction techniques of producing mass maps, we have developed a multi-resolution maximum-likelihood reconstruction method for producing two dimensional mass maps using weak gravitational lensing data. To utilize all the shear information, we employ an iterative inverse method with a properly selected regularization coefficient which fits the deflection potential at the position of each galaxy. By producing mass maps with multiple resolutions in the different parts of the observed field, we can achieve a comparable level of signal to noise by increasing the resolution in regions of higher distortions or regions with an over-density of background galaxies. In addition, we are able to better study the sub-structure of the massive clusters at a resolution which is not attainable in the rest of the observed field. We apply our method to the simulated data and to a four square degree field obtained by the Deep Lens Survey.

Preprint (30 pages, 10 figures), Submitted to ApJ

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Cited by in corpus (8)

• Cosmology and Fundamental Physics with the Euclid Satellite
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• SHELS: Testing Weak Lensing Maps with Redshift Surveys
• Dark Matter Structures In The Deep Lens Survey
• Testing Weak Lensing Maps With Redshift Surveys: A Subaru Field
• Shedding Light on the Matter of Abell 781
• Weak-lensing Mass Reconstruction of Galaxy Clusters with a Convolutional Neural Network -- II: Application to Next-Generation Wide-Field Surveys
• Continuous image distortion by astrophysical thick lenses