TURBULENCE PRODUCED BY TSUNAMIS IN GALAXY CLUSTERS

摘要: Clusters of galaxies are filled with X-ray emitted hot gas the temperature T 2-10 keV. Recent observations have been revealing unexpectedly that many cluster cores complicated, peculiar structures, which imply dynamical motion gas. Moreover, spectra indicate radiative cooling cool is suppressed by unknown heating mechanisms (the `cooling flow problem`). Here we propose a novel mechanism reproducing both inhomogeneous structures and dynamics in cores, based on state-of-the-art hydrodynamic simulations. We showed acoustic-gravity waves, naturally expected during process hierarchical structure formation universe, surge gas, causing serous impact core. This reminds us tsunamis ocean surging into an distant island. found waves create fully-developed, stable turbulence, reproduces complicated if wave amplitude large enough, they can suppress The turbulence could be detected near-future space missions such as ASTRO-E2.