On viscosity, conduction and sound waves in the intracluster medium

Details On viscosity, conduction and sound waves in the intracluster medium On viscosity, conduction and sound waves in the intracluster medium

2005-01-12

arxiv.org/abs/astro-ph/0501222v2

Mon.Not.Roy.Astron.Soc.363:891-896,2005

Astronomy and Astrophysics

Astrophysics

5 pages, 4 figures, MNRAS accepted

Scientific paper

10.1111/j.1365-2966.2005.09484.x

Recent X-ray and optical observations of the Perseus cluster indicate that the viscous and conductive dissipation of sound waves is the mechanism responsible for heating the intracluster medium and thus balancing radiative cooling of cluster cores. We discuss this mechanism more generally and show how the specific heating and cooling rates vary with temperature and radius. It appears that the heating mechanism is most effective above 10^7K, which allows for radiative cooling to proceed within normal galaxy formation but will stifle the growth of very massive galaxies. The scaling of the wavelength of sound waves with cluster temperature and feedback in the system are investigated.

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