AGN-ICM interaction in nearby cool core clusters
Energetics and transport processes
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Beschreibung
I present a detailed investigation of the AGN-ICM interaction in cool core clusters. I focused on M87 in the Virgo cluster and on Hydra A, where I found the first two known classical AGN-driven shocks with spectroscopically confirmed temperature and pressure jumps corresponding to consistent Mach numbers. I ran 1D hydrodynamic simulations of the large-scale shock in Hydra A to estimate its Mach number, age and energy. I also present 3D simulations which show that a bulk flow of the ICM is needed to reproduce the observed shock front shape. Also for M87 I found a “cold front” suggesting the presence of bulk motions in the form of sloshing in the ICM. Cool, metal-rich filaments, which can often be resolved into multi-temperature components, suggest moreover the crucial role of the AGN in uplifting the chemical elements produced by the central galaxy and transporting them into the ICM in both clusters. In M87, where the statistics allow detailed modeling of the temperature structure on small spatial scales, I found a correlation between the amount of cooler gas (compared to the surrounding ICM) and the metal abundance and deduced the metallicity of the gas uplifted by the AGN. I estimated the gas mass, Fe mass and energy associated with the uplift for both clusters and compared these energies with those needed to create the AGN-driven shocks. I moreover discussed the mechanisms and timescales required to produce the observed amount of metals and metal abundance ratios.
Autor*in
Aurora Simionescu
Themen in »AGN-ICM interaction in nearby cool core clusters«
Active galactic nuclei Black holes Cooling flows Galaxy clusters