NOAO >   Observing Info >   Approved Programs >   2014A-0157

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Proposal Information for 2014A-0157


PI: Andrej Favia, University of Maine, andrej.favia@umit.maine.edu
Address: Physics Department, 120 Bennett Hall, Orono, ME 04469, United States

CoI: David Batuski, University of Maine
CoI: Paul Howell, Boston University

Title: Mapping Dark Matter through Weak Lensing in the Extremely Overdense Aquarius and Microscopium Supercluster Cores

Abstract: We propose deep imaging of intra-cluster regions near the cores of two extremely overdense superclusters (overdensity 50-100 in terms of average spatial density of rich clusters): the Aquarius supercluster (ASC) and the Microscopium supercluster (MSC), both located at ~ - 30^\circ, for the purpose of mapping their dark matter distributions through weak lensing of sources behind them. These superclusters are similar in overdensity to the Corona Borealis supercluster (CSC). Our application of the Fundamental Plane (Batiste & Pearson, 2013) to the CSC suggests that there is collapse going on in the supercluster, whereas N-body analyses (Pearson & Batuski, 2013) indicate contrary results to that. The N-body analyses use only the masses within the clusters, which were shown to be insufficient to drive supercluster collapse, suggesting the presence of a yet undetected inter-cluster dark matter component. The ASC and MSC are similar objects to CSC. The DECam presents the perfect opportunity to trace the distribution of intra-cluster dark matter by imaging regions in our two supercluster cores (~ 3^\circ \times 3^\circ), with one field in each supercluster. Our analysis of the proposed photometry will map the distribution of dark matter through its weak lensing effects on sources behind our target supercluster cores.


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NOAO >   Observing Info >   Approved Programs >   2014A-0157

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