2004/04/30 by P. Schuecker, A. Finoguenov, F. Miniati +2 · 1 citation
Physics and Astronomy · #astro-ph
paper · pdf · doi:10.1051/0004-6361:20041039
published as Astron.Astrophys. 426 (2004) 387-397 · 12 pages, 13 figures (low resolution), version accepted by Astron. Astrophys
arxiv created 2004/07/26 · arxiv updated 2009/12/01
Spatially-resolved gas pressure maps of the Coma galaxy cluster are obtained from a mosaic of XMM-Newton observations in the scale range between a resolution of 20 kpc and an extent of 2.8 Mpc. A Fourier analysis of the data reveals the presence of a scale-invariant pressure fluctuation spectrum in the range between 40 and 90 kpc and is found to be well described by a projected Kolmogorov/Oboukhov-type turbulence spectrum. Deprojection and integration of the spectrum yields the lower limit of ∼ 10 percent of the total intracluster medium pressure in turbulent form. The results also provide observational constraints on the viscosity of the gas.