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          Institute: MPI für Astrophysik     Collection: High Energy Astrophysics at MPA     Display Documents



ID: 10389.0, MPI für Astrophysik / High Energy Astrophysics at MPA
Simulation of radio plasma in clusters of galaxies
Authors:Brüggen, M.; Kaiser, C. R.; Churazov, E.; Ensslin, T. A.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Mon. Not. Roy. Astron. Soc.
Volume:331
Issue / Number:3
Start Page:545
End Page:555
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present three-dimensional hydrodynamical simulations of buoyant gas in a typical cluster environment. In these simulations, hot matter was injected continuously into a small region offset from the cluster centre. In agreement with previous analytic estimates, we found that the bubbles evolve very differently depending on the rate of energy injection. Using tracer particles we computed the efficiency of the bubbles to stir the intracluster medium (ICM) and find that recurrent low-power sources are more effective in mixing the inner cluster region than rarer large outbursts. Moreover, we computed radio maps of the bubbles based on different assumptions about the magnetic field. In the radio band the bubbles closely resemble FR I sources. For the bubbles to be detectable for long enough to account for FR I sources, we found that reacceleration has to take place. The bubbles are generally difficult to detect, both in the radio and in the X- ray band. Thus it is possible to hide a significant amount of energy in the form of bubbles in clusters.
Free Keywords:galaxies : active; galaxies : clusters : individual : Virgo; cooling flows; X-rays : galaxies
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik
Identifiers:ISI:000175270500004
ISSN:0035-8711
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