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Mémoire de synthèse : De la théorie aux modèles d'éjections

Abstract : Ejections from stars is a common phenomenon. Stellar or extra-galactic jets are characterized by strongly accelerated plasma in the form of a bipolar flow more or less collimated along the rotation axis of the source. We have analysed the role of rotation, pressure and magnetic fields in the processes of accelerating and collimating the plasma jets and on their stability. We have shown the existence in these flows of MHD horizons and ergospheres analogous to their well known counterparts in the metrics of Black Holes. Self similar models of jets and winds allowed us to define general physical criteria for the classification of outflows depending on their energy distribution. We have applied such models to various objects such as the solar wind, jets from Young Stellar Objets and jets from Active Galactic Nuclei. For these objects, specific extension to the relativistic domain is demanded which is a point under consideration.
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Contributor : Christophe Sauty <>
Submitted on : Tuesday, November 9, 2004 - 3:08:21 PM
Last modification on : Wednesday, October 14, 2020 - 4:12:47 AM
Long-term archiving on: : Friday, April 2, 2010 - 8:50:01 PM


  • HAL Id : tel-00007354, version 1



Christophe Sauty. Mémoire de synthèse : De la théorie aux modèles d'éjections. Astrophysique [astro-ph]. Université Paris-Diderot - Paris VII, 2002. ⟨tel-00007354⟩



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