Department of Physics & Astronomy

Fall 2008 Colloquia

 

Alexie Leauthaud

Alexie Leauthaud


Chamberlain Fellow
Lawrence Berkeley National Laboratory
Properties of Groups and Clusters of Galaxies via Weak Gravitational Lensing
October 13, 2008 4PM, Thornton 411

With a primary goal of conducting precision weak lensing measurements from space, the COSMOS survey has imaged the largest contiguous area observed by the Hubble Space Telescope (HST) to date using the Advanced Camera for Surveys (ACS). In addition, the COSMOS field also contains deep imaging with the XMM & CHANDRA telescopes, allowing for the detection of groups and clusters of galaxies through their extended X-ray emission. In this talk, I will present ongoing work to measure the dark matter properties of groups and clusters by studying the weak lensing signal that they imprint on distant faint galaxies. In particular, I will focus on measurements of their total mass as a function of their X-ray luminosity (Lx) in the aim of calibrating the Halo Mass - Lx relation.
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