Dual site agreed for Square Kilometre Array telescope

A view of the site chosen for SKA satelites.


The Members of the SKA Organisation today agreed on a dual site solution for the Square Kilometre Array telescope, a crucial step towards building the world’s largest and most sensitive radio telescope.

The ASKAP and MeerKAT precursor dishes will be incorporated into Phase I of the SKA which will deliver more science and will maximise on investments already made by both Australia and South Africa.

The majority of the members were in favour of a dual-site implementation model for SKA. The members noted the report from the SKA Site Advisory Committee that both sites were well suited to hosting the SKA and that the report provided justification for the relative advantages and disadvantages of both locations, but that they identified Southern Africa as the preferred site. The members also received advice from the working group set up to look at dual site options.

The majority of SKA dishes in Phase 1 will be built in South Africa, combined with MeerKAT. Further SKA dishes will be added to the ASKAP array in Australia. All the dishes and the mid frequency aperture arrays for Phase II of the SKA will be built in Southern Africa while the low frequency aperture array antennas for Phase I and II will be built in Australia / New Zealand.

“This hugely important step for the project allows us to progress the design and prepare for the construction phase of the telescope. The SKA will transform our view of the Universe; with it we will see back to the moments after the Big Bang and discover previously unexplored parts of the cosmos.” says Dr Michiel van Haarlem, Interim Director General of the SKA Organisation.

The SKA will enable astronomers to glimpse the formation and evolution of the very first stars and galaxies after the Big Bang, investigate the nature of gravity, and possibly even discover life beyond Earth.

“Today we are a stage closer to achieving our goal of building the SKA. This position was reached after very careful consideration of information gathered from extensive investigations at both candidate sites,” said Professor John Womersley, Chair of the SKA Board of Directors.

Factors taken into account during the site selection process included levels of radio frequency interference, the long term sustainability of a radio quiet zone, the physical characteristics of the site, long distance data network connectivity, the operating and infrastructure costs as well as the political and working environment.

The agreement was reached by the Members of the SKA Organisation who did not bid to host the SKA (Canada, China, Italy, the Netherlands and the United Kingdom). The Office of the SKA Organisation will now lead a detailed definition period to clarify the implementation.

Scientists and engineers from around the world, together with industry partners, are participating in the SKA project which is driving technology development in antennas, data transport, software and computing, and power. The influence of the SKA project extends beyond radio astronomy. The design, construction and operation of the SKA have the potential to impact skills development, employment and economic growth in science, engineering and associated industries, not only in the host countries but in all partner countries.

South African Minister Naledi Pandor's reply

The long and eagerly awaited announcement regarding the site for the Square Kilometre Array (SKA) radio telescope was made following the meeting of the members of the SKA Organisation at Schiphol Airport in the Netherlands.

After nine-years of work by the South African and Australian SKA site bid teams, the independent SKA Site Advisory Committee (SSAC), composed of world-renowned experts, carried out an objective technical and scientific assessment of the sites in South Africa and Australia, and identified by consensus Africa as the preferred site.

However, in order to be inclusive, the SKA Organisation has agreed to consider constructing one of the three SKA receiver components in Australia. Two will be constructed in Africa. A meeting of the members has decided to split the project which is an unexpected decision given the search for a single site. We had hoped the unambiguous recommendation of the SSAC would be accepted as the most sound scientific outcome. We accept the compromise in the interest of science and as acknowledgement of the sterling work done by our scientists and the excellent SKA project team.

An important aspect of the site decision is the recognition of the MeerKAT telescope, being designed and built in the Northern Cape Karoo by South African scientists and engineers, as a critical step towards the implementation of the SKA. The MeerKAT will supplement the sensitive SKA Phase 1 dish array, providing the majority of the collection area of what will be the most sensitive radio telescope in the world. This recognition is substantive evidence of the great strides made by the local radio astronomy community since South Africa signalled its interest in the SKA.

South Africa, with its eight partner countries – Botswana, Ghana, Kenya, Madagascar, Mauritius, Mozambique, Namibia and Zambia – have been working on the bid to host the SKA since 2003. The final proposal was submitted to the SKA Siting Group on 15 September 2011.

On the basis of its analysis of technical, scientific and other factors, the SSAC unambiguously and by consensus found in favour of the African proposal, as well as the African implementation plans and cost factors. Consequently, the SSAC recommended South Africa and its partner countries as the preferred site for the SKA.

The SKA project is a global scientific enterprise to build one of the largest scientific instruments ever envisaged. It is being designed to answer fundamental questions in physics, astronomy and cosmology in order for us to understand the origin and workings of the Universe better, and to reveal new and unexpected phenomena that will enthral and challenge us. Since 2005, we have awarded nearly 400 grants and bursaries to postdoctoral fellows and PhD and MSc students and undergraduate students.

We remain committed to the SKA project.



 
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