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December 9th 2019

The iconic 50-year old Westerbork Synthesis Radio Telescope (WSRT) has been upgraded with a new high-speed, wide-field radio camera called Apertif. Using a technique called beamforming, 12 of the 14 dishes are now able to map a part of the sky that is 37 times larger than before. Apertif is also a pathfinder of the Square Kilometre Array (SKA), the future largest and most sensitive radio telescope in the world, recognised by the SKA project.

Evolution of galaxies
Apertif will map a big part of the northern sky to make radio images of the neutral hydrogen gas in the Universe, providing a unique and new view of the properties and distribution of gas in galaxies. It will also look at a smaller part of the sky in much more detail, giving us a sharper picture of very faint, nearby galaxies, as well as galaxies in the very distant Universe. These two surveys will lead to new insights into the formation and evolution of galaxies. The collected data will be used by future researchers for decades to come.

The exploding Universe
The upgraded telescope will also search for the most powerful explosions in the Universe, called Fast Radio Bursts (FRBs). The origin and nature of these extremely bright flashes of radio light, that travel billions of light years to reach Earth, are still largely a mystery. Because the flashes last only a fraction of a second, they are very easy to miss and difficult to observe. This is going to change with Apertif, which will continuously make a high-speed movie of the radio sky that will be analysed by the most powerful GPU-supercomputer in the Netherlands.

Institute-wide effort
The upgrade of Westerbork has been an institute-wide effort for ASTRON. "To develop a complex instrument such as Apertif, many people from multiple disciplines have to collaborate closely," says project leader Agnes Mika. "That’s why engineers from different departments have been working together in one room for more than a year. This improved the communication and problem-solving significantly. I am very proud of the whole team, and happy to see Apertif become operational."

More information
For more information, please visit the ASTRON website.