Academic Journal
Magnetised plasma turbulence in clusters of galaxies
| العنوان: | Magnetised plasma turbulence in clusters of galaxies |
|---|---|
| المؤلفون: | K. T. Chy˙zy, R. -j. Dettmar, K. Otmianowska-mazur, M. Soida, A. A. Schekochihin, S. C. Cowley, R. M. Kulsrud, G. W. Hammett, P. Sharma |
| المساهمون: | The Pennsylvania State University CiteSeerX Archives |
| المصدر: | http://arxiv.org/pdf/astro-ph/0411781v1.pdf. |
| سنة النشر: | 2004 |
| المجموعة: | CiteSeerX |
| الوصف: | Cluster plasmas are magnetised already at very low magnetic field strength. Low collisionality implies that conservation of the first adiabatic invariant results in an anisotropic viscous stress (Braginskii viscosity) or, equivalently, anisotropic plasma pressure. This triggers firehose and mirror instabilities, which have growth rates proportional to the wavenumber down to scales of the order of ion Larmor radius. This means that MHD equations with Braginskii viscosity are not well posed and fully kinetic description is necessary. In this paper, we review the basic picture of small-scale dynamo in the cluster plasma and attempt to reconcile it with the existence of plasma instabilities at collisionless scales. The intracluster medium (ICM) is a unique environment for studying astrophysical turbulence: it is made of amorphous diffuse fully ionised plasma with almost no net rotation or shear. The ICM is, therefore, in a certain sense, a case of “pure ” turbulence. The presence of magnetic fields in the ICM with B ∼ 1.10 µG and field scale ∼ 1 kpc is well documented (e.g., Carilli & Taylor 2002). Because of the availability of the rotation measure data from extended radio sources, it is possible to infer the magnetic-energy spectra for some of the clusters |
| نوع الوثيقة: | text |
| وصف الملف: | application/pdf |
| اللغة: | English |
| Relation: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.255.799; http://arxiv.org/pdf/astro-ph/0411781v1.pdf |
| الاتاحة: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.255.799 http://arxiv.org/pdf/astro-ph/0411781v1.pdf |
| Rights: | Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
| رقم الانضمام: | edsbas.E37AC03D |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |