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Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/3284

Title: Reconstruction of cluster masses using particle based lensing
Authors: Deb, Sanghamitra
Keywords: Physics;Gravitational lenses;Galaxies -- Clusters
Issue Date: 17-Jun-2010
Abstract: Clusters of galaxies are among the richest astrophysical data systems, but to truly understand these systems, we need a detailed study of the relationship between observables and the underlying cluster dark matter distribution. Gravitational lensing is the most direct probe of dark matter, but many mass reconstruction techniques assume that cluster light traces mass, or combine different lensing signals in an ad hoc way. In this talk, we will describe ”Particle Based Lensing” (PBL), a new method for cluster mass reconstruction, that avoids many of the pitfalls of previous techniques. PBL optimally combines lensing information of varying signal-to-noise, and makes no assumptions about the relationship between mass and light. we will describe mass reconstructions in three very different, but very illuminating cluster systems: the ”Bullet Cluster”(1E 0657-56), A901/902 and A1689. The “Bullet Cluster” is a system of merging clusters made famous by the first unambiguous lensing detection of dark matter. A901/902 is a multi-cluster system with four peaks, and provides an ideal laboratory for studying cluster interaction. we am particularly interested In measuring and correlating the dark matter clump ellipticities. A1689 is one of the richest clusters known, and has significant substructure at the core. It is also my first exercise in optimally combining weak and strong gravitational lensing in a cluster reconstruction. we find that the dark matter distribution is significantly clumpier than indicated by X-ray maps of the gas.we conclude by discussing various potential applications of PBL to existing and future data.
URI: http://hdl.handle.net/1860/3284
Appears in Collections:Drexel Theses and Dissertations

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