Australia’s newest radio telescope is predicted to find an unprecedented 700,000 new galaxies, say scientists planning for CSIRO’s next-generation Australian Square Kilometre Array Pathfinder (ASKAP).
In a paper published in the Monthly Notices of the Royal Astronomical Society, Australian researchers have combined computer simulations with ASKAP’s specifications to predict the new telescope’s extraordinary capabilities.
“ASKAP is a highly capable telescope. Its surveys will find more galaxies, further away and be able to study them in more detail than any other radio telescope in the world until the SKA Is built,” says Alan Duffy from The Univ. of Western Australia node of the International Centre for Radio Astronomy Research.
“Our simulation is similar to testing a Formula 1 car in a wind tunnel before using it on the track.”
ASKAP will start scanning southern skies in 2013 as a forerunner to the massive Square Kilometre Array (SKA), which will be shared between Australia-New Zealand and Southern Africa.
Duffy says two ASKAP surveys, WALLABY and DINGO, would examine galaxies to study hydrogen gas – the fuel that forms stars – and how those galaxies had changed in the last 4 billion years, allowing us to better understand how our own galaxy, the Milky Way, grew.
“We predict that WALLABY will find an amazing 600,000 new galaxies and DINGO 100,000, spread over trillions of cubic light years of space.”
Duffy says the new ASKAP galaxy surveys would also allow astronomers to probe the nature of one of astronomy’s greatest mysteries - Dark Energy.
Combining a large simulation of the Universe with new theories of galaxy formation − including the effects of supermassive black holes − had led scientists to accurately predict where as-yet undiscovered galaxies should be located, Duffy says.
“We calculated how much of the model Universe ASKAP could observe using details of the telescope’s capabilities,” says co-author Baerbel Koribalski, who has recently been appointed as an Office of the Chief Executive Science Leader at the CSIRO.
Co-author Associate Prof. Darren Croton from Swinburne Univ. of Technology also says the predictions would be used to help scientists refine how to handle the large quantity of data ASKAP will produce and test theories of galaxy formation.
“If we don't see this many galaxies, then the Universe is strangely different to our simulations,” Associate Prof. Croton says.
ASKAP will become part of the world’s largest telescope – the SKA.
ICRAR is a joint venture between Curtin University and The Univ. of Western Australia providing research excellence in the field of radio astronomy.