IFPU Colloquium: Chandra, HST, and Radio Observations of Clusters of Galaxies
Starts 24 Sep 2019 14:30
Ends 24 Sep 2019 15:30
Central European Time
Leonardo Building - Euler Lecture Hall
Abstract. Clusters of galaxies are the most massive gravitationally bound objects in the Universe. While most of their mass is Dark Matter, the primary component of their visible matter is hot X-ray gas. A significant fraction of clusters are still growing through the infall of groups of galaxies or through the mergers of clusters. These cluster mergers are the most energetic events in the present Universe, after the Big Bang, releasing energies up to 10^64 ergs. Cluster mergers leave distinct signatures on the intracluster medium in the form of shocked gas and diffuse radio sources, relics. Most of the gravitational energy released during the merger is converted into shocks and gas turbulence in the cluster gas. This talk will highlight Chandra X-ray and radio results on the HST Frontier Fields clusters MACSJ017.5+3745, MACSJ1149.6+2223, and A2744, which are undergoing major mergers. Recent results on the merger of the A3411 and A3412 clusters show strong evidence for the electron re-acceleration at the merger site. Finally this talk will highlight results from the HST RELICS (Reionization Lensing Cluster Survey) which has led to the detection of very high redshift (z~10) galaxies which are strongly lensed by foreground clusters.
ICTP - Strada Costiera, 11
I - 34151 Trieste Italy (+39) 040 2240 111 firstname.lastname@example.org