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: email@example.com
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.