This thesis focuses on the X-ray spectral analysis of merging galaxy clusters and the plasma code development for future high-resolution X-ray spectroscopy observations.

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

This thesis focus on the interaction between M dwarf stellar winds and Galactic cosmic rays and the possible effects on the habitability of exoplanets.

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I have studied the hot, diffuse gas around and between galaxies. Specifically, I have used the EAGLE numerical simulations of galaxy formation to predict the properties of this gas, and I have used those properties to predict specific observables: soft X-ray absorption and emission lines.

Promotor: J.S. Kaastra Co-promotor: E. Constantini

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

PhD defence

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 dissertation provides a comprehensive overview of the grammar of Bantawa, a Kiranti (Rai) language spoken in Eastern Nepal.

This thesis examines silicon pore optics (SPO), a technology that exploits silicon wafers from the semiconductor industry to create extremely high quality X-ray optics, by studying its manufacturing process, applications, and prospects.

The Netherlands Organisation for Scientific Research NWO allocates nearly € 19.5 million to a Dutch cluster that contributes to the development of an X-ray camera and spectrograph for the new European space telescope Athena. Leiden Observatory is one of the members of the cluster.

Scientists from Leiden and Delft recently discovered old texts using X-ray radiation. The subject was reported in the English newspaper The Guardian.

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

The intracluster medium (ICM) is a hot, tenuous and X-ray emitting gas that pervades galaxy clusters.

X-ray and CT scanners are widely used devices in research, diagnostics and the industrial sector. And yet they are not nearly as fast and accurate as we would like. Mathé Zeegers is researching the newest technique in the field at the Centre for Mathematics and Computer Science: spectral X-ray imaging.…

A special type of mirror to reflect X-rays has more possible applications than space research. Targeted radiation therapy for cancer, for example. Next to his full-time job, physicist David Girou mapped out the possibilities. He will receive his PhD on 14 June.

'Don’t Let the sunny weather fool you' a film made by Visual Ethnography alumna Guusje Meeuwissen has been selected for the RAI film festival in London this year. It's a short film about the everyday lives of a farmer and a fisherman in the Philippines, and their capacity to adapt to a changing natural…

Through the clever use of two types of telescopes, a team of researchers has produced stunning images of clusters of galaxies. This not only produces beautiful images, but also provides more information about the enormous amounts of energy released around supermassive black holes in clusters. The astronomers,…

Promotor: M. de Jong, Co-Promotor: Samtleben

Pulsars were first discovered in 1967 and since then the population has grown and expanded over several wavelengths.

Promotor: J.W.M. Frenken, Co-Promotor: R. Felici

Promotor: Prof.dr. M. de Jong, Co-Promotor: Dr. A.J. Heijboer

Promotor: Prof.dr. M. Ubbink

Promotor: A. Doelman, Co-promotor: J.D.M. Rademacher

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

This inspiring collection adds stories to the fact that 68% of PhDs in the Netherlands continue their career outside academia.

What impact does a mid-season wildfire have on grassland invertebrates?

Promotor: Prof.dr. J.W.M. Frenken

Following the Big Bang, structure in the Universe started collapsing under the force of gravity. This resulted in the formation of the first stars, galaxies and clusters of galaxies.

The research aims to explore the evolutionary adaptability of enzymes and the impact of temperature on protein evolution pathways, using M. tuberculosis β-lactamase BlaC as the object of study. Enzymes inherently embody a delicate balance between activity and stability, and the acquisition of new enzymatic…

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.

The skin barrier function is provided by the stratum corneum (SC). The lipids in the SC are composed of three lipid classes: ceramides (CERs), cholesterol (CHOL) and free fatty acids (FFAs) which form two crystalline lamellar structures. In the present study, we investigate the effect of CER chain length…

Promotor: G.R. de Snoo Co-promotor: C.J.M. Musters

With textnets it is possible to visualize and analyze textual data in novel ways.

Does a mid-season fire impact invertebrate populations?

Develop a tool to assess land tenure, access to land and, and land tenure conflict in Timor-Leste

Assistant Professor Karlsson Linnér, who works at the Department of Economics, is one of the recipients of a Veni grant. His research on the accuracy of preventive genetic testing is a fine example of the intersection of economic science and law.

The main topic of this PhD thesis is the Arakelov ray class group of a number field, an algebraic object that contains both the ideal class group structure and the unit group structure.

Radiography is an important technique to inspect objects, with applications in airports and hospitals. X-ray imaging is also essential in industry, for instance in food safety checks for the presence of foreign objects.

In this thesis, I studied the origin and evolution of the non-thermal radiation in merging galaxy clusters.

To construct catalysts that can produce fuels from CO2 innumerable times, we need to learn much more about how catalysis works. Irene Groot is conducting groundbreaking research into catalysis at the atomic level.

This book argues that Dutch Brazil (1624–54) is an integral part of Atlantic history and that it made an impact well beyond colonial and national narratives in the Netherlands and Brazil.