Buoyant bubbles in a cooling intracluster medium I. Hydrodynamic bubbles

摘要: Aims. Over the past several years, numerous examples of X-ray cavities coincident with radio sources have been observed in so-called "cool core" clusters galaxies. Motivated by these observations, we explore evolution and effect on a cooling intracluster medium (ICM) numerically, adding relevant physics step step. Methods. In this paper present first set hydrodynamical, high resolution (1024 3 effective grid elements), three-dimensional simulations, together two-dimensional test cases. The simulations follow cavities, modeled as bubbles filled relativistic plasma, cluster atmosphere, while ICM is subject to cooling. Results. We find that bubble rise retards development flow inducing motions ICM, which repeatedly displace material core. Even initially significantly far from center affect flow, although much later than beginning simulation. is, however, modest: time increased at most only 25%. As expected, overall pure hydrodynamic odds showing some additional has be considered match data.