Straat, Jill (2025) Tracers of the outer Milky Way stellar halo. Master's Thesis / Essay, Astronomy.
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Abstract
In this thesis, we aimed to learn more about stellar streams by looking at different tracers in the Halo. To achieve this, we used Blue Horizontal Branch stars, RR Lyraes and Red Giant Branch stars from Gaia, Pristine and Pan-STARRS1 to study the metallicity distribution and stellar ratios of the Sagittarius stream, Jhelum and GD-1. We developed a method to select these streams based on position and proper motion to avoid biasing towards a specific survey while selecting the streams. Using these samples, we found that the metallicities in Sgr from the RGBs were well traced by the RRL metallicities. The distribution of the RRL was shifted down by 0.5 dex lower compared to the RGB metallicities. This is likely because RRLs are biased to metal-poor stars. The relation between the stellar ratio and metallicity was researched for Jhelum, GD-1, and Sgr Leading and Trailing arm. We found the strongest correlation between stellar ratio and metallicity for RRL/BHB, with an average Pearson correlation coefficient of 0.87. The other stellar ratios, RGB/RRL and RGB/BHB, also had good correlations but were slightly worse due to the large uncertainties caused by lower numbers of statistics.
| Item Type: | Thesis (Master's Thesis / Essay) |
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| Supervisor name: | Starkenburg, E. |
| Degree programme: | Astronomy |
| Thesis type: | Master's Thesis / Essay |
| Language: | English |
| Date Deposited: | 06 Feb 2025 08:47 |
| Last Modified: | 06 Feb 2025 08:47 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/34692 |
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