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MHD Aspects of Galactic Center Physics

Published online by Cambridge University Press:  23 September 2016

J. Heyvaerts
J. Heyvaerts*
Affiliation:
Laboratoire d'Astrophysique de l'Université Paris 7, DAEC – Observatoire de Meudon, 92195 Meudon Principal Cedex, France

Abstract

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This review addresses the question of MHD phenomena in the galactic center, which are expectedly important in view of the large value of the magnetic field. A physical similarity with other MHD environments where magnetic fields are dominated by a dense driver and dominate a more tenuous halo is recognized. Known physics rules this type of coupling. Most proposed MHD theories of the galactic center fit, at least partly, in this general frame. One of them views Sgr A and its environment up to 50pc as an active corona, similar to that of the sun. whose driver is some central accretion disk, which may (or may not) be the molecular ring. This unified picture is outlined and is shown to naturally explain a number of otherwise puzzling observed features, such as the radio arc and bridge, possibly the ionized minispiral and some aspects of the general energy balance of this region.

Type
Magnetic Phenomena
Information
Symposium - International Astronomical Union , Volume 136: The Galactic Center , 1989 , pp. 301 - 312
Copyright
Copyright © Kluwer 1989 

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