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SKA to be split between Australia, NZ and South Africa
Square Kilometre Array to be split between Australia, NZ and South Africa
26 May 2012
After many months of waiting, the Square
Kilometre Array (SKA) Organisation has finally announced
that the massive telescope array will be shared between
Australia-NZ and South Africa.
The SKA
Organisation made the announcement late on Friday at a
meeting in Amsterdam. See the announcement here. Below Australian experts
respond. More information and images are available on the Australian SKA website
Dr Lisa Harvey-Smith, CSIRO SKA Project Scientist
with CSIRO Astronomy & Space Science, comments:
"I welcome the SKA Organisation's announcement of a
dual-site implementation for the telescope in Australasia
and Southern Africa. This solution leverages the
considerable investment made by both parties, whilst
boosting the commitment to developing the planned high-tech
components of the array.
"Now this important milestone has been reached, it is time to focus on the detailed design and implementation of the project. I look forward to sharing this journey of astronomical discovery with all the international partners in this exciting global science project."
-----------
Professor
Bryan Gaensler, Director of the Centre for All-sky
Astrophysics, Sydney University, and was formerly the
International Project Scientist for the Square Kilometre
Array, comments:
"The Square Kilometre
Array is a concept that's been slowly growing and evolving
since 1991. But today this ambitious project took a sudden
giant leap towards reality with the announcement of the SKA
site decision. The decision is a complex one, which
recognises the enormous amount of international investment
that will be needed to make the SKA happen: the array will
be split between Africa and Australia/New Zealand.
"What this does not mean is that half the telescope will be built in each continent. Each site gets a full square kilometre of collecting area, with the full scientific functionality originally envisaged. However, the SKA's science goals require a facility that can tune into radio waves ranging from 70 MHz up to above 10,000 MHz. It's impossible for any single technology to cover this vast range, so the plan has always been to build two or even three different types of antennas, which together can span the full range needed.
"What the SKA project has decided is to put different technologies in different places, playing to the strengths of each site.
"The lowest frequency component, consisting of antennas that do not move or steer and that can collect signals from the whole sky at once, will be built in Australia and New Zealand. This capitalises on the superb radio quietness of the SKA core planned for Murchison in outback Western Australia - one of the few places on the planet that isn't polluted by FM radio and other artificial signals in this low frequency band.
"The higher frequency technology, consisting of more traditional steerable dishes like the one at Parkes, will be built in Africa. This naturally extends on the MeerKAT array of dishes already under construction at the SKA core site in the Karoo desert region of South Africa.
"The remaining piece of the puzzle are "phased array feeds", the fish-eye lens technology being developed by CSIRO for their Australian SKA Pathfinder (ASKAP) in Western Australia. These will be further developed and expanded in Australia and NZ, and then possibly later installed on dishes in Africa. Aus/NZ technology on an African telescope is truly a win-win scenario.
"Going forward, what this all means is that the money committed to construction by all the SKA's international partners can now begin to flow. The hard-working engineers and scientists in Aus/NZ and in Africa can go back to collaborating rather than competing. And the SKA will attract brilliant young researchers from around the world to help solve the daunting technological challenges ahead of us.
"Few people will appreciate the small teams at the heart of the two site bids who have sunk years of their lives into this project. For Australia and NZ, special mention must go to the extraordinary CSIRO team lead by Brian Boyle, Michelle Storey, Phil Diamond and Lisa Harvey-Smith, who made a superb case for Aus/NZ to host the SKA. Africa, led by Justin Jonas and Bernie Fanaroff, must also be congratulated, for creating a thriving African radio astronomy community and a stellar SKA site bid from scratch in barely 10 years. The governments involved have also all been extremely supportive: a positive sign that amidst all the other pressures and challenges, basic research and cosmic discovery still have a place in our nations' priorities.
"I am excited that the SKA now looks like it's really going to happen. I can't wait to point it at my favourite stars and galaxies, and to get the data in my hands!"
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Jonathan Nally,
editor of Australian space news web site, SpaceInfo.com.au
comments: "Today's SKA decision is a sensible solution
to the quandry of trying to choose between two very equal
bids.
"Significant precursor work has been done in both Australia and in South Africa ... on sites, facilities and telescope technology. It makes sense to take the best of these developments and continue to progress them.
"In Australia, a huge development effort by governments, the CSIRO and universities has seen a number of new radio telescopes already built, or soon to be finished, in Western Australia -- including ASKAP, the Australian Square Kilometre Pathfinder, which is to be equipped with unique and world-leading CSIRO antenna technology that dramatically boosts the efficiencies of radio telescopes. Even before it has begun operating, ASKAP's first five years of operations are completely booked out by teams from Australia and around the world. ASKAP will form the kernel of much of the Australian share of the split SKA.
"By necessity, big science these days is an international affair, and both Australian scientists and the worldwide scientific community will benefit greatly from the development of the SKA and the unforeseen discoveries it will bring."
From the UK SMC:
Dr Stephen Serjeant, Head of Astronomy and Reader in Cosmology at The Open University, comments:
"This was always going to be an extremely difficult and finely-balanced decision, given that both the Australian and the South African bids were extremely strong, with excellent governmental support, existing investment in precursor telescopes, plus very fine protected sites for radio astronomy perfect for the SKA location. This split site decision will involve some increased complication and cost, but both bids have managed to build tremendous national and international momentum and support, so any single-site decision would have been a very bitter blow to one community.
"I'm confident that the SKA split-site
decision will be to the lasting benefit of astronomy as a
whole, as well as to the industrial bases in all the hosting
countries. The SKA itself will revolutionise many areas of
fundamental science, from cosmology to fundamental physics
to the birth of planets to the first light in the
Universe."
ends
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