Viktor Ziskin
Institut d'Astrophysique de Paris (Paris, France)
Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris
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| « Simulations of Cooling Flow Clusters with Thermal Conduction » |
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Viktor Ziskin |
| Recent high resolution X-ray observations have dramatically changed our understanding of the gas in the intracluster medium. Regarding cooling flows, in particular, which were believed to be a widespread phenomenon in all types of clusters as well as large galaxies, the new data has turned this view around completely. Massive cooling flows of the kind that were being predicted a decade ago - and supported by the data at the time - have not been observed, and no consensus exists, yet, about the mechanisms by which they might be suppressed. One of the solutions to this problem currently being proposed is that thermal conduction may be able to bring energy from the hot outer regions of the cluster and thus balance radiative cooling in the core. Different semi-analytical models and one-dimensional simulations give diverging answers as to whether or not conduction can be the mechanism, and I will argue that full, three-dimensional simulations are needed. I will review the problems surrounding cooling flows in clusters, briefly review the methods of numerical simulations and the inclusion of heat conduction in particular, and show preliminary results of such simulations. |
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vendredi 7 novembre 2003 - 11:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |