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Astrophysics Luncheon Seminar

Understanding Lensing Galaxy Clusters: What are we Learning from Simulations?
Presented by Massimo Meneghetti
Jet Propulsion Laboratory / Bologna Observatory

Monday, October 21, 2013
12:00 noon in 169-336

I will discuss how the usage of numerical simulations and ray-tracing techniques can help us understanding some of the controversies currently present in the field of gravitational lensing by galaxy clusters. After a brief introduction on the topic, I will first focus on simulations aimed at characterizing the largest gravitational lenses in the Universe. Then, in the attempt to better compare simulations and observations, I will talk about state-of-the-art image simulations of lensing, showing how their usage is allowing to understand biases and systematics in the lensing analysis. Finally, I will focus on the CLASH Multi-Cycle-Treasury program of the HST and I will explain how we are deriving theoretical expectations for several properties of the clusters in the sample using a large set of high-resolution cluster-sized halos extracted from the Multidark cosmological box.

JPL Contact: Julian Merten (626-375-4366)

SVCP Astrophysics

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