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Galaxy Dynamics: The dynamics of galaxy discs

Series
Theoretical Physics - From Outer Space to Plasma
Video Embed
Dr John Magorrian will talk about the dynamics of galaxy discs
In galaxy discs it is energetically favourable for angular momentum to move outwards and mass to move inwards. This transportation is effected by spiral arms, but what causes them? Simple linear response calculations demonstrate that even the smallest perturbation is amplified manyfold, while the differential rotation of the disc means that the response is stretched out into a spiral-like pattern. John Magorrian will introduce the notion of the disc as a resonant cavity, within which spiral density perturbations rattle back and forth.

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Episode Information

Series
Theoretical Physics - From Outer Space to Plasma
People
John Magorrian
Keywords
galaxy
gravity
dynamics
Department: Department of Physics
Date Added: 25/01/2018
Duration: 00:44:24

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