A prominent research theme at ASTRON involves the study of Cosmic Dawn (CD) and Epoch of Reionization (EoR) with LOFAR. These eras span the first billion years of the Universe’s history when the first stars and galaxies appeared and died, forming the first elements that make up everything that we see around us today. This period in the history of the Universe remains the least explored. Advancing our understanding of this early universe has been a primary motivation for the construction of the Square Kilometre Array.

Searching the 21-cm line

LOFAR is searching for the 21-cm line signal from diffuse neutral hydrogen between 110 and about 200 MHz, corresponding to a Cosmic time between 400 and 900 million years after the Big-Bang. More recently, the AARTFAAC system on LOFAR is also being used to search for similar signal from the earlier cosmic dawn epoch, about 200 million years after the big bang.

Most of the current group members are based at ASTRON and the Kapteyn Astronomical Institute of the University of Groningen, but the team involves members from e.g. the UK, Germany and Sweden.

Research staff

Andre Offeringa

Harish Vedantham

Latest tweets

Morgen 10/6 is een gedeeltelijke zonsverduistering. De @radiotelescoop gaat dit in samenwerking met @OudeSterrewacht live volgen, livestream: http://camras.nl/livestream. Onze collega’s in Leiden zorgen voor beeld en @radiotelescoop meet de intensiteit van de zonsverduistering.

Congratulations to @AstroJoeC for winning the Louise Webster Prize @AstroSocAus for his @nresearchnews paper on ‘Wolf-Rayet' stars (a kind believed to explode as supernovae) ! 🎉

🏆 More on the prize: https://asa.astronomy.org.au/prizes_and-grants/prizes-awards/louise-webster-prize/

📡 More on the paper: https://www.astron.nl/cosmic-serpent-reveals-new-way-massive-stars-die/

Another impressive result for LOFAR! An international team of astronomers from @UniLeiden & @mediainaf discovered a galaxy that seems to be wagging it's tail, a tail of 2,5 million light years long! https://bit.ly/2QBTL9W 💫

Another impressive result for @LOFAR! An international team of astronomers from @UniLeiden & @mediainaf discovered a galaxy that seems to be wagging it's tail, a tail of 2,5 million light years long! https://bit.ly/2QBTL9W 💫

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