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University of Groningen

Galactic dynamics in the era of Gaia

Hagen, Jorrit

DOI:

10.33612/diss.111512030

IMPORTANT NOTE: You are advised to consult the publisher's version (publisher's PDF) if you wish to cite from it. Please check the document version below.

Document Version

Publisher's PDF, also known as Version of record

Publication date: 2020

Link to publication in University of Groningen/UMCG research database

Citation for published version (APA):

Hagen, J. (2020). Galactic dynamics in the era of Gaia. Rijksuniversiteit Groningen. https://doi.org/10.33612/diss.111512030

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Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum.

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Propositions

accompanying the dissertation

Galactic dynamics in the era of Gaia

1. Observations made with the Gaia satellite provide an important test bed for galaxy evolution models (Chapter 1).

2. The systematic errors on the local dark matter density estimate are much larger than the formal statistical errors (Chapter 2).

3. Whether or not the tilt of the velocity ellipsoid in the Milky Way is spherically aligned across the volume probed by Gaia will be determined by analysis of future data releases (Chapter 3).

4. Not all substructures in the space of orbital parameters are due to merger debris (Chapter 4).

5. The mass of dwarf spheroidal galaxies can be determined rea-sonably well, even if they are modelled by assuming an incorrect potential functional form and shape (Chapter 5).

6. A future giant leap for understanding the dynamics of the Milky Way would be to measure stellar accelerations.

7. Good astronomical observations are meaningful on their own, simulations first need to be tested observationally before their predictions can be interpreted.

8. Astronomy outreach fosters curiosity, curiosity drives astronomy.

9. Planet Earth should always be treasured, as well as its night sky.

10. Science is based on facts, but scientists are not fully objective.

11. The direct detection of gravitational waves has thrilled the world.

12. Working in an internationally oriented (research) institute is an effective way of learning about different cultures.

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