Journal Article

Swimming against the current: simulations of central AGN evolution in dynamic galaxy clusters

Brian J. Morsony, Sebastian Heinz, Marcus Brüggen and Mateusz Ruszkowski

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 407, issue 2, pages 1277-1289
Published in print September 2010 | ISSN: 0035-8711
Published online September 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17059.x
Swimming against the current: simulations of central AGN evolution in dynamic galaxy clusters

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We present a series of three-dimensional hydrodynamical simulations of central active galactic nuclei (AGN)-driven jets in a dynamic, cosmologically evolved galaxy cluster. Extending previous work, we study jet powers ranging from Ljet= 1044 erg s−1 to Ljet= 1046 erg s−1 and in duration from 30 to 200 Myr. We find that large-scale motions of cluster gas disrupt the AGN jets, causing energy to be distributed throughout the centre of the cluster, rather than confined to a narrow angle around the jet axis. Disruption of the jet also leads to the appearance of multiple disconnected X-ray bubbles from a long-duration AGN with a constant luminosity. This implies that observations of multiple bubbles in a cluster are not necessarily an expression of the AGN duty cycle. We find that the ‘sphere of influence’ of the AGN, the radial scale within which the cluster is strongly affected by the jet, scales as RL1/3jet. Increasing the duration of AGN activity does not increase the radius affected by the AGN significantly, but does change the magnitude of the AGN's effects. How an AGN delivers energy to a cluster will determine where that energy is deposited: a high luminosity is needed to heat material outside the core of the cluster, while a low-luminosity, long-duration AGN is more efficient at heating the inner few tens of kpc.

Keywords: galaxies: active; galaxies: clusters: general; intergalactic medium; galaxies: jets

Journal Article.  7309 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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