Seminar: Rachel Paterno-Mahler [West Los Angeles College]
The Search for High Redshift Galaxy Clusters and What’s Behind Them
Sep 20, 2018 11:00 AM to Sep 20, 2018 12:00 PM at Building 8 - Room 241
Galaxy clusters are the largest gravitationally bound objects in our universe. As such, they can be used to investigate many properties of our universe, including the large-scale structure and dark matter distribution, galaxy formation and evolution, and cosmological parameters. Many of these properties depend on accurately determining cluster mass, which is calculated from an easily observable quantity such as X-ray luminosity or temperature of the cluster, over a wide range of redshifts. In addition, galaxy clusters can be used as cosmic telescopes to observe the background universe, from understanding the fundamental size scale of star formation during the period of peak star formation to discovering a statistically significant sample of high-redshift galaxies, which are necessary to constrain the number of galaxies at each age of the universe. I will discuss two surveys that I am using to accomplish these goals. First, I will present the COBRA (Clusters Occupied by Bent Radio AGN) Survey, which uses bent, double-lobed radio AGN (active galactic nuclei) as tracers to find high-redshift galaxy clusters. Second I will discuss RELICS (Reionization Lensing Cluster Survey), where we look for galaxies forming very early in the history of the universe in order to create a representative sample.