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Astrophysics Colloquium

Galaxy Protoclusters
Presented by Nina Hatch
School of Physics and Astronomy, Unversity of Nottingham, UK

Thursday, April 16, 2015
4:00 P.M. in 169-336

Abstract
Galaxy clusters are the largest collapsed structures in the Universe. They are used both as cosmological probes, and as laboratories for studying galaxy formation and evolution. In my talk I will discuss some recent theoretical work investigating the early-time (1 < z < 3) formation of these clusters. At this epoch the clusters were not the collapsed, virialized structures we see today. Instead we see their progenitors; a diffuse collection of small haloes that will merge over several billion years to form the cluster. The term "protocluster" is often used to describe this early state. I will use detailed semi-analytic models to discuss the difference between high-redshift clusters and protoclusters. I will then present some recent observations of protoclusters at z~2, revealing their complex structure for the first time, and show how the properties of the member galaxies are highly dependent on where they are located within this structure. Finally, I will show how these protoclusters can be used as laboratories for studying galaxy evolution during the epoch of peak star formation and AGN feedback.

JPL Contact: Daniel Stern (4-7264)


SVCP Astrophysics


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