Physics Program Presents
Friday, October 16, 2020
Fantastic 'Lobes' and Where to Find Them:
A Study of Early Universe Galaxy Clusters with Bent, Double-Lobed Radio Sources
12:00 pm – 1:00 pm EST/GMT-5
Emmet Golden-Marx, Boston UniversityGalaxy clusters are the largest gravitationally-bound structures in the universe. These cosmic megacities are made up of hundreds of galaxies, hot X-ray emitting gas, and dark matter. Although there are large populations of well-studied, relatively nearby clusters, as we probe earlier in the universe, galaxy clusters change and evolve. As such, understanding how these massive structures and the galaxies within them change over time is essential to understanding the evolution of the universe. To identify distant clusters, we take advantage of energetic supermassive black holes (called Radio Active Galactic Nuclei – Radio AGNs), which are an excellent tracer of large structures in the local and early universe. Specifically, we use a particular type of radio AGN--a bent, double lobed radio source--to identify galaxy clusters because of the link between the radio source’s appearance and the cluster’s gas. In this talk, I will present recent findings from the COBRA survey (Clusters Occupied by Bent Radio AGN). Specifically, I will show how we identify galaxy clusters by their populations of red elliptical galaxies and how the radio sources that we use to identify our clusters might be interacting with their host clusters to characterize the cluster’s evolutionary state.
For more information, call 845-758-6822, or e-mail firstname.lastname@example.org.
Time: 12:00 pm – 1:00 pm EST/GMT-5
Location: Online Event