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Title: Modelling tidal streams from galactic satellites
Author: Hasanuddin
Awarding Body: University of Leicester
Current Institution: University of Leicester
Date of Award: 2019
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Astrophysical simulations are very useful for understanding the physical phenomena of the stellar systems. In this simulation, the computational cost is one of the main concern. To tackle this issue, a choice of the time-step criterion is crucial. In this thesis, I study the efficiency of the time-step depending on the tidal force. This quantity follows gauge invariance under adding a constant acceleration where this property is not owned by conventional time-step criteria. Time step function based on the tidal force is more efficient than other time-step criteria. The observed tidal streams are very important to constrain the Galactic potential and the distribution of sub-haloes structure in the Milky-Way. In this thesis, I present a restricted N-body model for tidal debris to simulate the formation of tidal streams from Galactic satellites. If the satellite orbits are close to a Galactic disc, the structures of tidal debris do not spread in one dimension like the conventional streams but form two dimensions structures like a ribbon. This phenomenon can be explained analytically by action-angle variables and Hamiltonian formalism. This restricted N-body method has fewer ad-hoc assumptions and is more accurate than the alternative (and popular) particle sprinkling techniques at only a modest increase of the computational expense.
Supervisor: Dehnen, Walter ; Wilkinson, Mark Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available