Probing Turbulence in the Coma Galaxy Cluster

Details Probing Turbulence in the Coma Galaxy Cluster Probing Turbulence in the Coma Galaxy Cluster

2004-04-06

arxiv.org/abs/astro-ph/0404132v2

Astron.Astrophys. 426 (2004) 387-397

Astronomy and Astrophysics

Astrophysics

12 pages, 13 figures (low resolution), version accepted by Astron. Astrophys

Scientific paper

10.1051/0004-6361:20041039

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 $\sim 10$ percent of the total intracluster medium pressure in turbulent form. The results also provide observational constraints on the viscosity of the gas.

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