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Astronomy Colloquium: "Counting Giants: Cosmology from Massive Sunyaev-Zel'dovich Galaxy Clusters"

Event Type
Department of Astronomy
Astronomy 134
Sep 3, 2013   4:00 - 5:00 pm  
Felipe Menanteau
Originating Calendar
Astronomy Colloquium Speaker Calendar

We have reached the era where microwave surveys such as the Atacama

Cosmology Telescope (ACT), the South Pole Telescope (SPT) and Planck are

reporting their samples of massive galaxy clusters through the

Sunyaev-Zel'dovich (SZ) effect. In this talk I will introduce a new set

of optically-confirmed high redshift galaxy clusters discovered by ACT

through the SZ effect observations since 2009 as well as our ambitious

program to identify and characterize the galaxy clusters using a

plethora of multi-wavelength observations (Chandra, XMM, Spitzer,

Hubble, Gemini and VLT). As part of this program I will discuss our

discovery of "El Gordo" as the most massive and hottest (X-ray) cluster

known in the distant universe and its implications within the LCDM

framework. I will also discuss our large program aimed to calibrate the

different mass scaling relations for clusters necessary to exploit their

counts as a function of mass and redshift to probe of structure growth

and cosmology.

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