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Sound waves in the intracluster medium


Shabala, SS and Alexander, P, Sound waves in the intracluster medium, Royal Astronomical Society. Monthly Notices, 392, (4) pp. 1413-1420. ISSN 0035-8711 (2009) [Refereed Article]

DOI: doi:10.1111/j.1365-2966.2008.14125.x


We present an analysis of the behaviour of a perturbed radio cocoon. Comparisons with observations of sound waves detected in the Perseus and Virgo clusters suggest the separations of observed ripples correspond to the natural oscillation frequency of the cocoon. An energy injection rate consistent with active galactic nucleus power is required to offset the strong acoustic damping of cocoon oscillations, suggesting the sources are in equilibrium with the intracluster medium (ICM), and the oscillations are effectively undamped. Viscous dissipation of sound waves provides ICM heating that can quench cooling flows on time-scales greatly exceeding the oscillation time-scale. Thermal conductivity is likely to be heavily suppressed.

Item Details

Item Type:Refereed Article
Keywords:waves – galaxies: active – galaxies: clusters: general – cooling flows – intergalactic
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Astronomical sciences not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Shabala, SS (Associate Professor Stas Shabala)
ID Code:72490
Year Published:2009
Web of Science® Times Cited:6
Deposited By:Physics
Deposited On:2011-08-29
Last Modified:2015-02-17

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