Gas Perturbations in the Cool Cores of Galaxy Clusters: Effective Equation of State, Velocity Power Spectra, and Turbulent Heating

摘要: We present the statistical analysis of X-ray surface brightness and gas density fluctuations in cool cores 10 nearby, X-ray-bright galaxy clusters that have deep Chandra observations show observational indications radio-mechanical active galactic nucleus (AGN) feedback. Within central parts cores, total variance is dominated by isobaric and/or isothermal on spatial scales similar to 10-60 kpc, which are likely associated with slow motions bubbles relativistic plasma. Adiabatic fluctuations, weak shocks sonic turbulence, constitute less than 10% all clusters. The typical amplitude small, or 10-15 kpc. observed subdominant contribution adiabatic small support a model gentle AGN measured one-component velocities typically below 100-150 km s(-1) <50 kpc can be up 300 100 scales. nonthermal energy <12% thermal energy. Regardless source drives these motions, dissipation such provides heat sufficient balance radiative cooling average, albeit significant uncertainties. results presented here previous conclusions based Virgo Perseus Clusters agree Hitomi measurements. With next-generation observatories like Athena Lynx, techniques will yet more powerful.