Probing turbulence in the Coma galaxy cluster

被引：243

作者：

Schuecker, P

Finoguenov, A

Miniati, F

Böhriner, H

Briel, UG

机构：

[1] Max Planck Inst Extraterr Phys, D-85741 Garching, Germany

[2] Max Planck Inst Astrophys, D-85741 Garching, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2004年 / 426卷 / 02期

关键词：

X-rays : galaxies : clusters; galaxies : clusters : general; cosmology : theory; turbulence;

D O I：

10.1051/0004-6361:20041039

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 similar to10 percent of the total intracluster medium pressure in turbulent form. The results also provide observational constraints on the viscosity of the gas.

引用

页码：387 / 397

页数：11

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