Oral Presentation
Cool-core/non-cool-core dichotomy: the interplay among cluster mergers, radiative cooling, and AGN feedback
Presenter: Hsiang-Yi Karen Yang (National Tsing Hua University)
The origin of cool-core (CC) and non-cool-core (NCC) dichotomy of galaxy clusters remains uncertain. Previous simulations have found that cluster mergers are effective in destroying CCs but fail to prevent overcooling in cluster cores when radiative cooling is included. Feedback from active galactic nuclei (AGN) is a promising mechanism for balancing cooling in CCs; however, the role of AGN feedback in CC/NCC transitions remains elusive. In this talk, I will present results from the first comprehensive set of three-dimensional binary cluster merger simulations with varied mass ratios and impact parameters incorporating AGN feedback and radiative cooling, aiming to investigate the heating effects from mergers and AGN feedback on CC destruction. We find that AGN feedback is essential in regulating the merging clusters, and that the outcomes of CC survival/destruction critically depend on the merger parameters.
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