University of Groningen
Detailed stellar populations of dwarf elliptical galaxies Sen, Seyda
DOI:
10.33612/diss.118163076
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Publication date: 2020
Link to publication in University of Groningen/UMCG research database
Citation for published version (APA):
Sen, S. (2020). Detailed stellar populations of dwarf elliptical galaxies. Rijksuniversiteit Groningen. https://doi.org/10.33612/diss.118163076
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Propositions
accompanying the dissertation
Detailed Stellar Populations of Dwarf Elliptical Galaxies
1) In dwarf elliptical galaxies (dEs) [Na/Fe] is underabundant with respect to solar, whereas [Mg/Fe] is around solar. This is exactly opposite to what is found in giant ellipticals where both Na and Mg are overabundant. (Chapter 2)
2) dEs fall on a relatively tight relation between [Na/Fe] and [Fe/H], which includes Local Group dwarf galaxies, the Milky Way, and giant elliptical galaxies. (Chapter 2)
3) To study the population of dwarf ellipticals, it will be very useful to study a large sample by making a large cluster wide survey of deep integral-field spectroscopic observations. (This thesis)
4) The new set of high resolution indices defined in Chapter 3 makes it possible to study in detail individual element abundance ratios of many elements in small, unresolved galaxies outside the Local Group. (Chapter 3 and 4)
5) A growing body of evidence indicates that dwarf galaxies form their stars slowly, like the disk of our Milky Way, which implies that dwarf ellipticals form from star forming dwarfs losing their interstellar medium when entering the cluster. (Chapter 2 and 4) 6) Observational studies using powerful, forthcoming instruments will allow us to build a
much clearer picture of how the various chemical elements were built up in dwarf galaxies and in the Universe. (This thesis)
7) A prerequisite of the universality of science is freedom of work and communication in science, and the opportunity for every nation and everyone to participate in, and profit from science. For this, not only our knowledge should cross borders but also we scientists should be able to cross borders without visa.
8) When seeking answers, science often comes with many more questions. 9) “Our true mentor in life is science.” (M. K. Atatürk)
