| Type |
Journal Article |
| Names |
Brian J. Morsony, Sebastian Heinz, Marcus Brüggen, Mateusz Ruszkowski |
| Publication |
Monthly Notices of the Royal Astronomical Society |
| Volume |
407 |
| Issue |
2 |
| Pages |
1277-1289 |
| Date |
September 1, 2010 |
| Short Title |
Swimming against the current |
| URL |
http://adsabs.harvard.edu/abs/2010MNRAS.407.1277M |
| Library Catalog |
NASA ADS |
| Abstract |
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 =
1044ergs-1 to Ljet =
1046ergs-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 R ~
L1/3jet. 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. |
| Tags |
GALAXIES: CLUSTERS: GENERAL, galaxies: active, galaxies: jets, intergalactic medium |