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Time evolution of gaps in tidal streams

Koppelman, H.H. (2016) Time evolution of gaps in tidal streams. Master's Thesis / Essay, Astronomy.

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We model the time evolution of gaps in tidal streams caused by collisions with dark matter subhalos, whose existence is predicted by the cold dark matter cosmological model. Detecting and analyzing these subhalos is therefore key to verifying this model. We develop a prescription to describe the evolution of a gap as the divergence of two nearby orbits in action-angle variables: one orbit on each side of the gap. We test this model in a spherical and in an axisymmetric potential, finding very good matches to the N-body experiments. Overall, we find that gaps grow linear in time t. We conclude that the size of the gap not only depends on the geometry of the impact, and on the size of the subhalo, but also on the orbital phase of the collision. Encounters with different subhalo parameters will produce the same gap size at different times.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Astronomy
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 08:25
Last Modified: 15 Feb 2018 08:25

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