Abstract
Gravitational flexion measures toward substructure in the Frontier Fields
Bulletin of the American Astronomical Society, #231, id. 252.13
Jan 2018
Abstract
We present results for utilizing weak lensing analysis in the identification and classification of the dark matter substructure in galaxy clusters. Using a previously developed flexion analysis package (FLEXTOOL) gravitationally lensed images are analyzed for their flexion signal, the anisotropic inward "bowing" of a lensed object. The measured flexion signal can be decomposed toward a nearest-neighbor lensing galaxy as a means for identifying dark matter structure within the lensing galaxy cluster. A figure-of-merit is developed for classifying the underlying substructure using source object size, measured flexion strength and nearest-neighbor radial distance. The analysis is applied to the Abell 2744 and MACS J0416.1-2403 galaxy clusters in the HST Frontier Fields program. This is the first such work that directly identifies individual substructure using weak gravitational flexion.
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Details
- Title
- Gravitational flexion measures toward substructure in the Frontier Fields
- Creators
- Joseph Michael Fabritius - Drexel UniversityDavid M Goldberg - Drexel UniversityJustin P Bird - Drexel University
- Publication Details
- Bulletin of the American Astronomical Society, #231, id. 252.13
- Conference
- 231st Meeting of the American Astronomical Society (Washington, District of Columbia, United States, 08 Jan 2018 - 12 Jan 2018)
- Publisher
- American Astronomical Society
- Resource Type
- Abstract
- Language
- English
- Academic Unit
- Physics
- Identifiers
- 991021906511104721