international-year-astronomy

JANET TAKES PART IN GLOBAL REAL-TIME RADIO-ASTRONOMY PROJECT

33 hour observation by 17 telescopes to celebrate launch of International Year of Astronomy

Lovell radio telescope 14January 2009: To celebrate the beginning of the International Year of Astronomy, 17 telescopes from around the world are taking part in a 33 hour real-time astronomical observation starting on 15 January 2009. This will enable astronomers to simultaneously observe areas of space through multiple telescopes, providing more detailed images of the universe than previously obtained. JANET, the UK’s national education and research network is participating in this collaboration, connecting with GÉANT2, the high bandwidth, pan-European research network and other research data networks across the globe, under the coordination of the Joint Institute for VLBI in Europe (JIVE).

Telescopes in the UK, Germany, Italy, Finland, Sweden, Poland, the Netherlands, US, Chile, Puerto Rico, Australia, China and Japan are taking part in the observation. The telescopes are observing three quasars J0204+1514, 0234+285 and 3C395, switching between the three to accommodate different frequency observing capabilities of the participating telescopes and streaming the data in real-time to JIVE.

The JANET Lightpath service is supporting this work by providing two 1Gbit/s links from the largest UK radio telescope, the Lovell telescope at Jodrell Bank near Manchester, to London, and then onwards over GEANT and Surfnet to the Science Centre in the Netherlands where the signals from all the telescopes are brought together.

The observation is being demonstrated live at the opening event of the International Year of Astronomy which is being held at UNESCO headquarters in Paris on 15/16 January 2009.

Through a technique called real-time, electronic Very Long Baseline Interferometry (e-VLBI), astronomers use multiple radio telescopes to observe the same region of sky simultaneously. Data collected by each telescope is sampled and sent to a central processor via high-speed communication networks. This central data processor, a purpose-built supercomputer, decodes, aligns and correlates the data for all possible pairs of telescopes. This results in the generation of images of cosmic radio sources with up to 100 times better resolution than images from the best optical telescopes.

EXPReS, a three-year project funded by the European Commission, uses data networks to link the telescopes, to send the data electronically and to correlate it in real-time. This eliminates the shipping of disks and provides astronomers with correlated data in a timely fashion, allowing them to exploit short-lived astronomical events such as supernovae and gamma ray bursts.

"As we enter the International Year of Astronomy this observation demonstrates how we can see further into the universe through real-time collaboration between astronomers across the globe," commented Dai Davies, general manager, DANTE. "Without high speed connectivity such real-time observations would be impossible, showing the power of research networking to assist leading organisations such as JIVE that are pushing back the frontiers of knowledge."

As well as GÉANT2 network, the observation is using the following data networks – APAN, AARNet, AMPATH, AtlanticWave, CANARIE, CENIC, Centennial, CSTNET, DFN, FUNET, GARR, Internet2, JANET, JGN2plus, Jülich Supercomputing Centre, MIT Lincoln Laboratory, Netherlight, NGIX, NORDUnet, PIONIER, RedCLARA, REUNA, Southern Cross Cables Network, StarLight, SUNET, SURFnet and TransPAC2.

"The International Year of Astronomy aims to make the general public more aware of the advances in astronomy and our understanding of the universe," commented Dr Huib van Langevelde, coordinator for the EXPReS project and director of JIVE. "This demonstration is particularly appealing as it shows how modern day techniques can advance astronomy by allowing new discoveries. High speed, scalable networks are at the heart of our operations, and working with partners such as DANTE enables us to chart evidence of previously unseen astronomical events."