Prof. dr. Leon Koopmans

I'm professor at the Kapteyn Astronomical Institute.

Previously, I've been Institute Fellow (now called "Giacconi Fellow") at the Space Telescope Science Institute, and research plus later visiting Fellow in the Theoretical Astrophysics Department at Caltech. I also worked as CERES Research Associate at the University of Manchester (JBO).

Research Interests:

My main research interests are in the field of cosmology, in particular the study of the nature and distribution of (dark) matter in the universe, the determination of the cosmological parameters and the formation of galaxies and first structures in the Universe. I prefer a strong interplay between observations, modelling and theory. I have two lines of research: Galaxy Structure & Evolution and the Epoch of Reionization

(1) In collaboration with Tommaso Treu (UCSB), I have started the Lenses Structure & Dynamics (LSD) Survey, and more recently also with collaborators at MIT/CfA and STScI/JPL, the Sloan Lens ACS Survey (SLACS), to measure the kinematic profiles (velocity dispersion and rotation velocity) of and discover new gravitational-lens galaxies out to redshifts of unity. The aim is the determine their internal mass structure and the evolution of their stellar content.

I have been a member of the ANGLES network, funded from 2004-2008 by the EU (FP6 RTN network) focussing on all aspects of strong lensing. Previously, I've also been involved in the CLASS (Cosmic Lens All Sky Survey) and CERES collaborations. The CLASS survey was part of the Consortium for European Research on Extragalactic Surveys (CERES) and has discovered the largest statistically complete radio-selected sample of gravitational lens systems to date, which is primarily used to constrain the cosmological parameters and the structure & evolution of galaxies at intermediate redshifts. For my research on lensing I was awared a VIDI career award in 2005.

(2) I am also co-PI in the Epoch of Reionization key-project of the Low Frequency Array (LOFAR). In particular, how to measure the 21-cm hyperfine transition line between z=6 and 11.5 from interferometric data, extract the EoR signal from the data, in the presence of foregrounds 4 orders of magnitude larger than the signal, and what can be learned from this. For my research on reionization I was awared a ERC ST Grant in 2010.

Projects Publications My Group Teaching (2016/2017)
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Maintained by: Leon Koopmans
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