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Simulation of radio plasma in clusters of galaxies

Simulation of radio plasma in clusters of galaxies
Simulation of radio plasma in clusters of galaxies
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.
0035-8711
545-555
Brüggen, M.
22978d12-1091-42aa-a172-6cda407ba55b
Kaiser, C.R.
a486973d-799c-401e-aa99-47dddd3972f7
Churazov, E.
a56d266c-65ec-4dcf-9355-4d481026ab4f
Enßlin, T.A.
b6f8fbf1-cd3e-478d-b727-6f06f921a707
Brüggen, M.
22978d12-1091-42aa-a172-6cda407ba55b
Kaiser, C.R.
a486973d-799c-401e-aa99-47dddd3972f7
Churazov, E.
a56d266c-65ec-4dcf-9355-4d481026ab4f
Enßlin, T.A.
b6f8fbf1-cd3e-478d-b727-6f06f921a707

Brüggen, M., Kaiser, C.R., Churazov, E. and Enßlin, T.A. (2002) Simulation of radio plasma in clusters of galaxies. Monthly Notices of the Royal Astronomical Society, 331 (3), 545-555. (doi:10.1046/j.1365-8711.2002.05233.x).

Record type: Article

Abstract

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.

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Published date: April 2002

Identifiers

Local EPrints ID: 14778
URI: http://eprints.soton.ac.uk/id/eprint/14778
ISSN: 0035-8711
PURE UUID: 90c18ba9-6a26-420d-a507-4b4b3fb6b1fe

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Date deposited: 28 Feb 2005
Last modified: 15 Jul 2019 19:33

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Contributors

Author: M. Brüggen
Author: C.R. Kaiser
Author: E. Churazov
Author: T.A. Enßlin

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