Giovinazzo, Emma (2022) Modelling Lyman-α Emitters in the Epoch of Reionization. Master's Thesis / Essay, Astronomy.
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Abstract
Lyman-α emitters are a class of star forming galaxies selected for their strong emission in the Lyman-α line and are uniquely useful to study the end of the Epoch of Reionization. However, Lyman-α is a resonant line, so its complex radiative transfer effects make the interpretation of the line challenging and require the use of appropriate radiative transfer codes for anything but the simplest gas distributions. I have used the RASCAS radiative transfer code to perform synthetic observations on a sample of galaxies from the OBELISK simulation at redshift z = 6 to study a variety of galaxy properties. I have also explored how the ionizing radiation escape fraction in the simulation compares to the value inferred from the Lyman-α spectrum. Lastly, I have studied how the dust distribution affects the Lyman-α line by comparing two different dust models, one where the dust follows the metals and another one where the dust was taken directly from OBELISK. Overall, I have concluded that weak trends seem to exist between observable and intrinsic properties, with a large scattering possibly due to a large variation in galaxy properties and that my sample only partially follows the relation between Lyman-α peak separation and ionizing radiation escape fraction. Moreover, the two dust models produce similar results, although with a small systematic effect hinting that the models might start diverging at high gas masses, and some spatial variation.
| Item Type: | Thesis (Master's Thesis / Essay) |
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| Supervisor name: | Dayal, P. and Trebitsch, M. |
| Degree programme: | Astronomy |
| Thesis type: | Master's Thesis / Essay |
| Language: | English |
| Date Deposited: | 03 Oct 2022 09:13 |
| Last Modified: | 03 Oct 2022 09:13 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/28792 |
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