AGN feedback in clusters: shock and sound heating
arXiv:1304.0400 · doi:10.1002/asna.201211863
Abstract
Observations support the view that feedback, in the form of radio outbursts from active nuclei in central galaxies, prevents catastrophic cooling of gas and rapid star formation in many groups and clusters of galaxies. Variations in jet power drive a succession of weak shocks that can heat regions close to the active galactic nuclei (AGN). On larger scales, shocks fade into sound waves. The Braginskii viscosity determines a well-defined sound damping rate in the weakly magnetized intracluster medium (ICM) that can provide sufficient heating on larger scales. It is argued that weak shocks and sound dissipation are the main means by which radio AGN heat the ICM, in which case, the power spectrum of AGN outbursts plays a central role in AGN feedback.
4 pages, from the meeting "Galaxy Clusters as Giant Cosmic Laboratories," Madrid, May 2012, to appear in Astronomical Notes
References in corpus (6)
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Cited by in corpus (8)
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- The Onset of Thermally Unstable Cooling from the Hot Atmospheres of Giant Galaxies in Clusters - Constraints on Feedback Models
- Triggering and Delivery Algorithms for AGN Feedback
- High Radio Frequency Properties and Variability of Brightest Cluster Galaxies
- Mapping the Gas Turbulence in the Coma Cluster: Predictions for Astro-H
- Radio Weak BL Lac objects in the Fermi era
- Radio galaxies in ZFOURGE/NMBS: no difference in the properties of massive galaxies with and without radio-AGN out to z = 2.25
- A Multiwavelength Study of the Massive Cool Core Cluster MACS J1447.4+0827