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Chauffage Compressionnel de l'Environnement des Disques Magnétisés :
Du Centre Galactique aux Microquasars

Abstract : At the Galactic Center, the gas temperature is such that, if it were
collisional and mostly composed by hydrogen, it would escape quickly, so
that the power required to sustain the related energy losses would be huge.
We however show that the specific conditions of this region can lead to form
a helium plasma that is confined by the Galactic potential. In this
favorable situation, we study a possible heating mechanism based on the high
viscosity of the hot plasma and friction with cold molecular clouds flowing
in this region.

The corona of microquasars is a very similar issue but it is probably weakly
collisional. In this regime we study a heating by magnetic pumping, by which
the resonance between the periodic motion of some coronal ions and the
periodic excitation by an instability in the disc itself can energize the
corona. We show that this mechanism is inefficient to explain the hot
temperature.
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-00011431
Contributor : Simone Lantz <>
Submitted on : Friday, January 20, 2006 - 10:38:36 AM
Last modification on : Wednesday, October 21, 2020 - 4:32:14 PM
Long-term archiving on: : Monday, September 17, 2012 - 11:00:50 AM

Identifiers

  • HAL Id : tel-00011431, version 1

Citation

Renaud Belmont. Chauffage Compressionnel de l'Environnement des Disques Magnétisés :
Du Centre Galactique aux Microquasars. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00011431⟩

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