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AGN feedback through sound wave dissipation
Citation
Shabala, SS and Alexander, P, AGN feedback through sound wave dissipation, Astrophysics and Space Science, 311, (1) pp. 311-315. ISSN 0004-640X (2007) [Refereed Article]
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Copyright Statement
The final publication is available at http://www.springerlink.com
DOI: doi:10.1007/s10509-007-9521-9
Abstract
We investigate the possibility of explaining the
observed ripples in the X-ray gas in the Perseus and Virgo
clusters through natural oscillations of a perturbed radio cocoon.
Such a perturbation would result from an expanding
overpressured cocoon of radio plasma overshooting its pressure
equilibrium point with the cluster gas. The oscillations
are heavily acoustically damped, and energy injection rates
required to sustain them are consistent with observed AGN
powers. Viscous dissipation of sound waves generated by
these oscillations heats the cluster gas. By comparing our
model with observations in Perseus and Virgo, we reproduce
the observed ripple separations and amplitudes. Spitzer
viscosity is largely sufficient in explaining the gas density
profile, suggesting that thermal conductivity is likely to be
heavily suppressed. In the central regions, viscous heating
can suppress cooling flows on timescales exceeding the radio
source lifetime.
Item Details
Item Type: | Refereed Article |
---|---|
Keywords: | Galaxies: active · Galaxies: clusters: general · Cooling flows · Intergalactic medium |
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: | 72548 |
Year Published: | 2007 |
Web of Science® Times Cited: | 3 |
Deposited By: | Physics |
Deposited On: | 2011-08-29 |
Last Modified: | 2011-08-29 |
Downloads: | 0 |
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