Lunch talk on Dec. 30, 2024

Galaxy cluster merger shocks

Speaker: Chong Ge (XMU)

Venue: SWIFAR Building 2111

Time: 12:45 PM, Monday, Dec. 30, 2024

Abstract: 

Galaxy clusters are the most massive virialized systems in the Universe, forming hierarchically through the merger of smaller substructures. Major cluster mergers are the most energetic events since the Big Bang, with a substantial portion of the merger energy dissipated into the intracluster medium (ICM) through shock heating. The shocks can also re-accelerate pre-existing seed relativistic electrons in intracluster magnetic fields to produce radio synchrotron emissions known as radio relics or radio shocks. We find that seed electrons of radio relics may originate from star-forming (SF) activities besides the active galactic nucleus (AGN). We also constrain the intracluster magnetic fields based on the X-ray and radio observations. In addition, we provide evidence that cluster merger shocks can change cluster member galaxies and AGN jets.

Report PPT:  SWIFAR_Chong Ge.pdf