Galaxies in the local Universe fall into two main categories of spirals and ellipticals. In this Thesis, we explore the structural evolution of galaxies into this bimodal distribution.

Radio jets are important to the evoultion of galaxies. However, it is still not fully understood how a radio jet can be triggered.

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.

The thesis deals with the study of giant radio galaxies (GRGs), which are radio galaxies of megaparsec sizes.

The formation and evolution of galaxies is fundamentally driven by the formation of new stars out of cold gas.

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.

Outflows are crucially important for the gas budget and evolution of luminous star-forming galaxies and AGNs, with observed mass outflow rates of the same order as the star formation rate. Greater star formation and black hole growth lead to more intense feedback and outflows, resulting in self-regulated…

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

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.

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

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.

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

The origin and evolution of galaxies are closely linked to many different physical phenomena.

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

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

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

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

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

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

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…

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

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

Understanding how galaxies form, interact, and evolve comes largely from comparing theory predictions with observational data. Numerical simulations of galaxies provide the most accurate approach to testing the theory, as they follow the non-linear evolution of gas and dark matter in great detail and…

Noord-Korea zou volgens Zuid-Koreaanse inlichtingen al 1500 militairen in Rusland trainen voor de oorlog in Oekraïne. Noord-Korea-deskundige Remco Breuker van de Universiteit Leiden geeft in diverse media zijn visie op deze ontwikkeling.

Sobral

Nu in Nederland wordt geprotesteerd tegen bezuinigingen op het hoger onderwijs, besteedt radioprogramma Spraakmakers aan demonstraties wereldwijd. Hoogleraar Remco Breuker vertelt hoe demonstraties in Zuid-Korea eraan toegaan.

Dark matter is one of the biggest mysteries of the Universe. Its properties cannot be explained with the known laws of physics and elementary particles.

Wetenschappers waarschuwen voor geopolitieke risico's door onderwijsbezuinigingen. Breuker en Wits stellen in de Volkskrant dat Nederlandse universiteiten worden gekortwiekt op een cruciaal moment.

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

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.

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

Hoogleraar Koreastudies Remco Breuker verschijnt sinds zijn optreden bij Pauw steeds vaker in de media. NRC publiceerde een profiel over de door velen bestempelde 'sombere' academicus.

Gemiddeld 71% van de afgestudeerden Geesteswetenschappen vindt binnen twee maanden een goede baan. Toch lijkt het niet altijd even makkelijk om aan die eerste baan te komen. Columnisten Remco en Christel vertellen over de dingen die zij allemaal ondernemen.

Hoogleraar Koreastudies Remco Breuker geeft in Trouw zijn mening over het beperkte protest tegen het kabinet-Schoof. Ondanks enkele kleinschalige demonstraties blijft grootschalig verzet uit.

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

Met muziek, films en series verovert Zuid-Korea de wereld. Opvallend is het engagement dat regelmatig doorklinkt in deze culturele uitingen. In OneWorld legt hoogleraar Remco Breuker uit waar dit vandaan komt.