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ID: 10998.0, MPI für Astrophysik / Stellar Astrophysics
The hydrodynamics of dead radio galaxies
Authors:Reynolds, C. S.; Heinz, S.; Begelman, M. C.
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Monthly Notices of the Royal Astronomical Society
Journal Abbrev.:Mon. Not. Roy. Astron. Soc.
Issue / Number:2
Start Page:271
End Page:282
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We present a numerical investigation of dead, or relic, radio galaxies and the environmental impact that radio galaxy activity has on the host galaxy or galaxy cluster. We perform axisymmetric hydrodynamical calculations of light, supersonic, back-to-back jets propagating in a beta -model galaxy/cluster atmosphere. We then shut down the jet activity and let the resulting structure evolve passively. The dead source undergoes an initial phase of pressure driven expansion until it achieves pressure equilibrium with its surroundings. Thereafter, buoyancy forces drive the evolution and lead to the formation of two oppositely directed plumes that float high into the galaxy/cluster atmosphere. These plumes entrain a significant amount of low entropy material from the galaxy/cluster core and lift it high into the atmosphere. An important result is that a large fraction (at least half) of the energy injected by the jet activity is thermalized in the interstellar medium (ISM)/intracluster medium (ICM) core. The whole ISM/ICM atmosphere inflates in order to regain hydrostatic equilibrium. This inflation is mediated by an approximately spherical disturbance which propagates into the atmosphere at the sound speed. The fact that such a large fraction of the injected energy is thermalized suggests that radio galaxies may have an important role in the overall energy budget of rich ISM/ICM atmospheres. In particular, they may act as a strong and highly time-dependent source of negative feedback for galaxy/cluster cooling flows.
Free Keywords:hydrodynamics; cooling flows; galaxies : jets; X-rays : galaxies : clusters
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astrophysik/Hydrodynamics
External Affiliations:Univ Colorado, JILA, Campus Box 440, Boulder, CO 80309 USA; Univ Colorado, JILA, Boulder, CO 80309 USA; Univ Maryland, Dept Astron, College Pk, MD 20742 USA; Max Planck Inst Astrophys, D-85740 Garching, Germany; Univ Colorado, Dept Astrophys & Planetary Sci, Boulder, CO 80309 USA
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