Volume 426, Number 2, November I 2004
|Page(s)||387 - 397|
|Section||Cosmology (including clusters of galaxies)|
|Published online||11 October 2004|
Probing turbulence in the Coma galaxy cluster*
Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, 85741 Garching, Germany e-mail: firstname.lastname@example.org
2 Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str., 85741 Garching, Germany
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.
Key words: X-rays: galaxies: clusters / galaxies: clusters: general / cosmology: theory / turbulence
© ESO, 2004
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