Please use this identifier to cite or link to this item:
|Title:||Time-dependent dynamics of a planar galaxy model|
|Publisher:||Blackwell Publishing for the Royal Astronomical Society|
|Citation:||Monthly Notices of the Royal Astronomical Society, 1990, Vol.245, p713|
|Abstract:||Time-dependent models of collisionless stellar systems with harmonic potentials allowing for an essentially exact analytic description have recently been described. These include oscillating spheres and spheroids. This paper extends the analysis to time-dependent elliptic discs. Although restricted to two space dimensions, the systems are richer in that their parameters form a 10-dimensional phase space (in contrast to six for the earlier models). Apart from total energy and angular momentum, two additional conserved quantities emerge naturally. These can be chosen as the areas of extremal sections of the ellipsoidal region of phase space occupied by the system (their product gives the conserved volume). The present paper describes the construction of these models. An application to a tidal encounter is given which allows one to go beyond the impulse approximation and demonstrates the effects of rotation of the perturbed system on energy and angular-momentum transfer. The angular-momentum transfer is shown to scale inversely as the cube of the encounter velocity for an initial configuration of the perturbed galaxy with zero quadrupole moment.|
|Description:||Sorry, the full text of this article is not available here. Please click on the alternative location to access it.|
|Copyright:||(1990) Royal Astronomical Society|
|Appears in Collections:||Research Papers (A&A)|
Files in This Item:
There are no files associated with this item.
Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.