11–14 Aug 2014
Niels Bohr Institute
Europe/Copenhagen timezone

Stratified Turbulence, Heating, Cooling and Diffusion in Galaxy Clusters

11 Aug 2014, 16:00
25m
Auditorium A (Niels Bohr Institute)

Auditorium A

Niels Bohr Institute

Blegdamsvej 17 Copenhagen

Speaker

Prof. Alexander Schekochihin (University of Oxford)

Description

I will discuss what can be inferred about the structure of stratified turbulence in galaxy clusters from basic assumptions such as a generalised principle of critical balance [3,4]. I will then discuss how the conclusions from this exercise lead to a useful prescription for deducing velocity spectra in the ICM from the density fluctuation spectra [2] (measurable by existing X-ray observatories). One of the most striking observational consequences one can draw from such observations is that turbulent heating and radiative cooling in the cores of the brightest galaxy clusters appear to match each other locally in radial location (upcoming paper by I. Zhuravleva et al. [1]). Finally, I will discuss the role of turbulent diffusion vs. turbulent heating in a stratified ICM. References: [1] I. Zhuravleva, E. M. Churazov, A. A. Schekochihin et al. 2014, submitted [2] I. Zhuravleva et al. 2014, ApJ 788, L13 [arXiv:1404.5306] [3] S. V. Nazarenko & A. A. Schekochihin 2011, JFM 677, 134 [arXiv:0904.3488] [4] A. A. Schekochihin, I. Zhuravleva & E. M. Churazov 2014, in preparation

Primary author

Prof. Alexander Schekochihin (University of Oxford)

Co-authors

Dr Eugene Churazov (MPA) Dr Irina Zhuravleva (KIPAC)

Presentation materials

There are no materials yet.