Promotores: Prof.dr. F.P. Israel, Prof.dr. P.P. van der Werf

This thesis explores the theoretical and observational properties of distant massive galaxies that harbour active black holes in their centres and shine brightly at radio wavelengths.

When observing star-forming galaxies, we are not only seeing stellar light, but we also see how this interacts with galactic gas and dust. This thesis contains studies of the stellar, nebular and dust properties of low mass star-forming galaxies.

This thesis investigates the structural evolution and assembly of galaxies since the first few billions years after the big bang.

We investigate the buildup of galaxies from various vantage points. The first two chapters focus on the stellar content of galaxies, especially the distribution of stellar masses at birth and potential variations therein in various galactic environments.

This thesis aims to enhance our understanding of galaxies by testing theoretical models of galaxy formation against observations, particularly in the cases of extreme systems which have been found to have an excess of baryonic mass in their central regions, in the form of either supermassive black holes…

Promotor: H.J.A. Röttgering, Co-promotor: M. Haverkorn

Promotor: M. Franx, Co-Promotor: I.F. Labbé

Of all the mass in our Universe, 80% is thought to consist of a hypothetical and invisible substance called dark matter (DM).

Promotor: H.J.A. Röttgering, Co-promotor: G.K. Miley

Promotores: Prof.dr. M. Franx, Prof.dr. P.G. van Dokkum (Yale University)

Astronomen willen het heelal begrijpen, van de Oerknal tot nu, en hoe dit verder zal gaan. In Leiden concentreren ze zich daarbij op twee vragen: 'Hoe ontstaan sterren en planeten? en 'Hoe ontstonden in het jonge heelal sterrenstelsels en zwarte gaten?' Een nieuwe generatie telescopen – net klaar of…

Galaxies are environments where gas coalesces, cools, and is converted into stars. However, it remains unclear the exact mechanisms through which galaxies acquire, redistribute and lose their gas.

Galaxy intrinsic alignments induce a major astrophysical contamination to weak gravitational lensing measurements and need to be modelled and mitigated when extracting cosmological information from such measurements.

Promotor: Prof.dr. M. Franx, Co-Promotor: Rychard Bouwens

Wetenschappers bij de Leidse Sterrewacht onderzoeken de fundamenteel natuurkundige verschijnselen die voor structuur in het heelal zorgen. Deze processen brengen materie bijeen tot sterrenstelsels en gas bijeen tot sterren. Met behulp van krachtige telescopen en geavanceerde berekeningen en computersimulaties…

Promotores: Prof.dr. J. Schaye & Prof.dr. C. Steidel (California Institute of Technology)

Promotor: F.P. Israel, Co-Promoter: R. Meijerink

Hot astrophysical plasma is ubiquitous in the Universe, from comets in our Solar system to the largest scale structures -- the cosmic web filaments. These hot plasmas, with the temperature of a few millions of degrees, are often observed in the X-ray wavelength range.

Promotor: H.J.A. Rottgering, Co-Promotor: R.J. van Weeren

Promotores: Prof.dr. M. Franx, Prof.dr. M. Kriek (Univ. of California at Berkeley)

Sobral

This thesis investigates how galaxies form and what diversifies the evolutionary histories of galaxies.

Promotor: W. Jaffe, Co-promotor: K. Meisenheimer

Promotor: K. Kuijken, Co-Promotor: H. Hoekstra

Promotor: Koen Kuijken Co-promotor: Henk Hoekstra

Promotor: Prof.dr. K.H. Kuijken, Co-Promotor: H.Hoekstra

In this thesis, the research focuses on the properties of dark matter and dark matter haloes and how they connect with the galaxies we can observe in the Universe.

In this thesis, we use low-frequency and high-frequency radio observations to address the following questions regarding quasars: is the radio loud/quiet quasar dichotomy real?

This thesis presents pioneering work on the panchromatic emission of some of the most luminous galaxies in the early Universe: star forming galaxies and active galactic nuclei.

Promotor: A. Achúcarro Co-promotor: A. Boyarsky

Promotor: Jelle S. Kaastra Co-promotor: Jelle de Plaa

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OB associations are loose groups of young, massive stars. They constitute the last stage of the massive starformation process, and the context in which new stars are formed.

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Improvements of weak gravitational lensing shape measurements are presented and some used for data analysis.

Galaxies form and evolve through close interaction with their surroundings. As a result, the heavy elements ('metals') that are synthesized in stars, are found both inside and outside galaxies.

Promotor: Prof.dr. H.J.A. Rottgering

This thesis is about cosmological inflation and its relation to observations.