Homepage of Huib Intema

NOTE: I have moved to Leiden Observatory since July 2015. My homepage will remain here for now.


Welcome to my homepage. I am a radio astronomer working at Leiden Observatory, the astrophysics research institute of Leiden University in The Netherlands. My area of expertise is low-frequency radio interferometry, studying the Universe at radio frequencies below 1 GHz with telescopes like the Low-Frequency Array (LOFAR), the Very Large Array (VLA) and the Giant Metrewave Radio Telescope (GMRT). These are technically challenging observations to process, complicated by the need to image and deconvolve hundreds of sources in a typical Field Of View (FOV) of several degrees in diameter, the abundant presence of man-made Radio Frequency Interference (RFI), and the distorting effects of the Earth's ionosphere. Over the course of several years, I have build and refined a set of software tools to process these observations in an efficient and reproducible way, yielding high-quality images. These tools are now systematically applied in many different science projects involving low-frequency radio interferometric observations.

My primary astronomical goal is to understand the origin of large-scale diffuse radio emission in clusters of galaxies. This emission extends over areas of hundreds of kilo- parsecs – often a Mega-parsec or more – and appears to be unrelated to any individual galaxy in the cluster. Only a fraction of the known clusters harbors this kind of emission, but all of these show signs of recent merging activity. This strongly suggests that the energy required to generate these emission regions comes from the potential energy released in the merger, but the exact physical mechanisms are still debated. Understanding these mechanisms is part of the puzzle in understanding how the largest gravitationally bound structures in the Universe form and evolve.

At Leiden Observatory, I lead a project to characterize, model, suppress the effects of the ionosphere on low-frequency radio observations. This is specifically aimed at improving the quality of current LOFAR images, and to support the development of the SKA.


Dr. Huib T. Intema
Research scientist and project manager at Leiden Observatory (2015 – now)
Former VLA research associate at NRAO Socorro (2012 – 2015)
Former Jansky Fellow at NRAO Charlottesville (2009 – 2012)
Former Ph.D. student at Leiden Observatory (2005 – 2009), supervised by Huub Röttgering and George Miley
Former senior software engineer at High Tech Automation (1996 – 2000)
Contact info
Curriculum Vitae
Travel agenda

Research interests

Formation and evolution of galaxy clusters
Radio sky surveys
High redshift radio galaxies
Sub-GHz radio interferometry
Radio interferometry calibration and imaging techniques and algorithm development

Current and ongoing projects

SPAM: a Python-based data reduction extension to AIPS, including direction-dependent (ionospheric) calibration and imaging
T-RaMiSu: the Two-meter Radio Mini Survey
VLA low-band CASA Guide (under construction)
VLA Low-Band system: wide-bandwidth upgrades for the VLA 4- and P-band systems
Low-frequency radio imaging of the galaxy cluster Abell 2256
Low-frequency radio follow-up of Chandra-SPT clusters
MACS-Planck radio halo survey (PI Giulia Macario@OCA Nice)
Distant cluster halo/relic survey (PI Reinout van Weeren@Harvard)
Remote sensing of the ionosphere with radio interferometry (PI Joe Helmboldt@NRL)
ATLAS GMRT 610 MHz imaging of the ELAIS S1 field (PI Ray Norris@ATNF)
GMRT 330 MHz imaging of the COSMOS field (PI Alex Karim@Bonn)
GMRT 610 MHz imaging of the XXL-North field (PI Vernesa Smolcic@Zagreb)
P-band monitoring of the galactic center (PI Scott Hyman@SBC)

Project archive

The Bootes field at 150 MHz
LBGs in a wide field around radio galaxy TN J1338-1942 at z=4.1
Hydrodynamical modeling of spherical gravitational collapse


Publications on ADS
Pre-prints on arXiv

Statistics on Google Scholar
Ph.D. thesis at Leiden University digital library (2009)

Social media

skype huib.intema on skype
facebook Huib Intema on facebook
linkedin Huib Intema on linkedin
google Huib Intema on Google+
folder Homepage files on FTP

Useful links

NRAO archive
GMRT archive
GMRT observing schedule
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Topic revision: r32 - 2015-07-16, HuibIntema

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