Morphological asymmetry in mock HI observations of Simba galaxies

Talens, Rutger (2024) Morphological asymmetry in mock HI observations of Simba galaxies. Bachelor's Thesis, Astronomy.

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Abstract

The HI discs of galaxies are particularly sensitive to disruption from external influences, due to their extent to large radii. Asymmetries in a galaxy’s HI morphology are therefore thought to leave clues of a galaxy’s dynamical history, from which we could infer how it has interacted with its local environment. Since such interactions are often also responsible for the accretion or removal of gas, which play a crucial role in galaxy evolution, characterizing how these external processes induce asymmetries in HI morphology could reveal the importance of such processes and local environment in the evolution of galaxies. In this study, we set out to examine the changes in morphological HI asymmetries for a sample of 36 simulated galaxies that had experienced mergers, tidal interactions, or were isolated. The galaxies were simulated with the Simba simulations, from which we produced mock HI cubes with properties similar to real observations. We have quantified the HI asymmetry using the Amod parameter, which makes use of the moment-0 map, and investigated trends in asymmetry over 11 snapshots in time, spanning a total of ∼2.3 Gyr. Our findings imply a strong correlation between the various environmental influences a galaxy is subject to and the asymmetry in HI morphology of the galaxy.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Verheijen, M.A.W. and Hank, N.A.N. and Fraternali, F.
Degree programme:	Astronomy
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	12 Jul 2024 08:43
Last Modified:	12 Jul 2024 08:43
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/33298

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