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Probing the Epoch of Reionization with Lyman-alpha emitters

Luggenhorst, Thijs (2018) Probing the Epoch of Reionization with Lyman-alpha emitters. Bachelor's Thesis, Astronomy.


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In this thesis, a physical model for high-redshift Lyman-alpha emitters (LAEs) at the end of the Epoch of Reionization is analyzed. The aim of the research is to find out how the clustering of LAEs, divided in luminosity categories faint, intermediate and bright, changes as reionization proceeds. Three snapshots of a simulation box (of size 80 Mpc/h in all three spatial dimensions) at a fixed redshift of z = 6.6 are taken at different stages of reionization ((a) <χ_HI> = 0.50, (b) <χ_HI> = 0.25 and (c) <χ_HI> = 0.10). A sample of Lyman Break Galaxies (LBGs) is also analyzed for comparison between LAEs and LBGs. Bright galaxies show more clustering than intermediate ones, which show more clustering than faint galaxies. The clustering of LAEs is found to be highest at <χ_HI> = 0.50 and lowest at <χ_HI> = 0.10. This means that more LAEs are detected as reionization proceeds. The clustering model is compared to observational results by Kashikawa et al. (2006) and Ouchi et al. (2010). The clustering of LAEs in the model is found to be higher than the results by aforementioned authors. Reasons for the difference between the results include the fact that only one line-of-sight to the galaxy simulation box was considered, a fixed escape fraction f_esc = 0.50 for all galaxies in the model, a limit of the ionized fraction of <χ_HI> = 0.10, coincidental homogeneous sky observations, or the lack of confirmed LAEs in observations.

Item Type: Thesis (Bachelor's Thesis)
Supervisor name: Hutter, A.K.
Degree programme: Astronomy
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 12 Dec 2018
Last Modified: 18 Dec 2018 15:24

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