Investigating stellar streams in the retrograde Milky Way halo

Esselink, Anna (2022) Investigating stellar streams in the retrograde Milky Way halo. Bachelor's Thesis, Astronomy.

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Abstract

This thesis aims to detect stellar streams in the retrograde Milky Way halo using the Reduced Proper Motion selected halo sample created by Viswanathan et al. (2022) using data from Gaia EDR3. The sample provides photometric distances, that are more reliable than the Gaia parallaxes, for around 48 million stars. For seven globular clusters that were identified in the sample, the mean photometric and metallicity-dependent distance were computed. This provided reliable distances for three globular clusters. For the other clusters, the stars in the sample belonged to the main sequence turn-off instead of the main sequence. Consequently, their magnitudes were incorrectly assigned, resulting in incorrect distances. The color cut 0.45 > G−GRP > 0.715 was shown to effectively remove the majority of stars corresponding to the main sequence turn-off. To systematically find stellar streams the sample was probed for different spatial and proper motion intervals in the outer halo to create a series of plots. The streams GD-1, Jhelum, Indus, Ophiuchus, Ylgr, and Orphan were identified through these plots.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Starkenburg, E. and Viswanathan, A.
Degree programme:	Astronomy
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	03 Aug 2022 14:22
Last Modified:	01 Sep 2022 10:27
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/28017

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