Welcome!

I am a staff astronomer at the observatory of Leiden University and work on ELT/METIS and VLTI/MATISSE.

My main research interest is in the nuclear regions of active galaxies (Active Galactic Nuclei, AGNs) which I study using very high spatial resolution techniques, such as infrared interferometry and adaptive optics, and with spectroscopy.

AGNs are thought to play a major role in transforming galaxies from gas-rich spiral galaxies to the so called ‘red and dead’ ellipticals, at least in the most luminous galaxies. There is some agreement that ‘AGN feedback’ is important in this transformation as it could push out the molecular gas out of which stars form. However, clear observational evidence for this outflow is very hard to collect, especially at high redshift where this ‘co-evolution’ mostly occurs. In ‘local’ AGNs cosmic evolution does not play a role, but the physical processes in the nuclei can actually be resolved and studied in detail. It is my hope and my ambition that the insights we gain from resolved studies of the AGN phenomenon in the local universe will ultimately provide us with a better understanding of the global evolution of galaxies from the early universe until now.


Latest news

 Together with a number of colleagues, I am currently organising the workshop “Ground-based thermal infrared astronomy – past, present and future” at ESO Garching, in the week 30 March – 3 April 2020. The workshop aims to bring together experts in the field and can be seen as a follow-up conference to our last year’s Lorentz Center workshop on the same topic.

Registration is open until 8 March 2020.

We will support remote attendance (for free!).

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