This thesis develops a method for direction dependent calibration of the ionosphere in radio interferometric data.

In this thesis new methodologies are developed for the detection and systematic study of radio sources in the early universe. This allows us to gain a deeper understanding of the formation and evolution of galaxies, the activity of supermassive black holes, and the final phase transition of our universe:…

Welke impact hebben discussies over en bewezen beschuldigingen van etnisch profileren op organisaties en de (grens)politieagenten die op operationeel niveau werken? Gedurende een periode van drie jaar (november 2023 – november 2026) zal dit innovatieve transdisciplinaire onderzoeksproject zich richten…

Programma's die de symptomen van sociale angst bij kinderen willen verminderen, omvatten doorgaans meerdere onderdelen, zoals blootstelling en mentale herstructurering. Het is onbekend of afzonderlijke onderdelen positieve effecten opleveren bij kinderen of dat een combinatie van onderdelen nodig is…

Werken aan ICT bij een topuniversiteit? Met uitstekende carrièremogelijkheden? Ontdek het werken bij het ICT Shared Service Centre van de Universiteit Leiden.

Hoe is het om te werken bij de Universiteit Leiden en hoe zijn wij als werkgever? Diverse medewerkers delen graag hun ervaringen. Bekijk de video’s.

Samen met co-auteur M. De Jong schreef Willem van Boom een bijdrage over het Experiment resultaatgerelateerde beloning en of dat experiment aan zijn doel zal beantwoorden.

Wij bieden ruimte voor iedereen, ongeacht gender, culturele achtergrond, seksuele oriëntatie, gezondheid, religie, leeftijd en sociaal-economische achtergrond.

Wil je reageren op een vacature bij de Universiteit Leiden? Lees meer over onze sollicitatieprocedure. Dan weet je precies wat je kunt verwachten.

We weten dat het academische werk in grote lijnen onderwijs, onderzoek en dienstverlening omvat, maar hoe kunnen we, als we niet naar docenten luisteren, hen echt begrijpen en ondersteunen in hun rol om de agency van docenten te bevorderen?

Op 15 november 2023 is de Tijdelijke wet transparantie turboliquidatie (Tijdelijke wet) ingevoerd. Turboliquidatie is de snelle procedure voor ontbinding en beëindiging van rechtspersonen die geen baten meer hebben maar mogelijk nog wel schulden. Turboliquidatie is in de praktijk veruit de meest voorkomende…

Het Leids Astronomisch Dispuut Frederik Kaiser is een vereniging die zich inzet voor de studenten die in Leiden sterrenkunde studeren. Daarnaast zijn ze ook erg betrokken bij de publieksactiviteiten in de Oude Sterrewacht en helpen ze bij de ontwikkeling en uitvoering van andere projecten in het geb…

Voor Sterrenkunde is de matchingsactiviteit een verplicht onderdeel van de toelatingsprocedure voor studenten met een Nederlandse vooropleiding.

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.

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

Promotor: J. Schaye

A large diversity of exoplanetary systems has been found, but it is still unclear what drives this diversity.

In astronomy, the interpration of observations and measurements plays a crucial role: we rely purely and fundamentally on the information that reaches us as observers. And 80% of all matter in the universe is undetectable directly.

In this thesis, we present new laboratory data of interstellar dust analogues.

The focus of the dissertation

Promotor: Prof.dr. A.G.G.M. Tielens

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…

Stellar feedback is a crucial ingredient in the evolution of galaxies.

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…

Within the field of astronomy, understanding how galaxies grow and evolve from the Big Bang to the present day is a challenging and complex question.

Planets are formed in disks of gas and dust around young stars.

Promotor: Koen Kuijken Co-promotor: Henk Hoekstra

Promotor: Prof.dr. E.F. van Dishoeck, Co-Promotor: M.R. Hogerheijde

Polycyclic aromatic hydrocarbons (PAHs) are the most abundant class of organic compounds in space. The PAH field evolves from the constant interaction between experimentalists, theorists, modellers and observers. While laboratory research and quantum chemical calculations together set up the molecular…

This research delves into a region of space known as the interstellar medium (ISM), which is essentially the area between the stars filled with gas and dust.

Galaxies form and live inside dark matter haloes. As a consequence, they are exposed to the tidal fields generated by the surrounding matter distribution: this imprints a preferential direction to the galaxy shapes, which leads to a coherent alignment on physically close galaxies, called intrinsic a…

This thesis revolves around the electronic spectroscopy of molecules in the laboratory and the search for the carriers of the diffuse interstellar bands (DIBs).

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

Even though more than 4000 extra-solar planets are known today, only a small fraction of these has been captured in an image. To better understand the planet formation mechanisms in solar-like environments we started the Young Suns Exoplanet Survey (YSES).

The next generation of high-contrast imaging instruments on space-based observatories requires sophisticated wavefront sensing and control in addition to a high-performance coronagraph.

Many galaxy clusters exhibit bright diffuse radio emission that traces the underlying structure of the intracluster medium (ICM).

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.

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?

It has now been well established that shocks and turbulent motions in the intra-cluster medium (ICM) generated through cluster mergers can produce large-scale synchrotron emission.

This thesis focuses on protoplanetary disks: flattened structures of gas and dust around young stars in which planets are expected to form and grow.

Carbonaceous asteroids preserve a record of early solar system processes, where minerals and organic molecules, like polycyclic aromatic hydrocarbons (PAHs), offer clues to planetary evolution and prebiotic chemistry.

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

The field of exoplanet research is rapidly advancing through the development of new technology, observing techniques, and post-processing methods.

An Active Galactic Nucleus (AGN) is a highly luminous region at the center of a galaxy, powered by the accretion into a supermassive black hole and emitting energy from radio waves to gamma rays, often outshining the host galaxy.

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.

To study how planetary systems come into existence we study much younger systems still in formation.

The expedition commanded by Nicolas Baudin to Tenerife, Mauritius, Australia, Timor and South Africa in 1800-1804 is fully researched in regard to ornithology.

One of the key discoveries in exoplanet research over the past decade is the abundance of small planets in our Milky Way. Despite their high numbers, our understanding of their atmospheres remains limited, and it is unknown if they possess atmospheres at all.

Patterned detectors are an existing technology that can be found in almost all color cameras.