NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-19 T12:48:56 PDT
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For refcode 2004A&A...426..387S:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2004A&A...426..387S Probing turbulence in the Coma galaxy cluster P. Schuecker, A. Finoguenov, F. Miniati, H. Bohringer and U. G. Briel Received 6 April 2004 / Accepted 8 July 2004 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. Keywords: X-rays: galaxies: clusters, galaxies: clusters: general, cosmology: theory, turbulence
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