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Probing Turbulence in the Coma Galaxy Cluster | | P. Schuecker
; A. Finoguenov
; F. Miniati
; H. Boehringer
; U.G. Briel
; | | Date: |
6 Apr 2004 | | Subject: | astro-ph | | Abstract: | 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. | | Source: | arXiv, astro-ph/0404132 | | Services: | Forum | Review | PDF | Favorites | |
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