The first image from the international SKA Observatory’s telescope in Australia, SKA-Low, has been released, a milestone in its quest to reveal an unparalleled view of the Universe.
It is the first image from an early working version of the SKA-Low telescope, using just 1,024 of the planned 131,072 antennas and is an exciting indication of the scientific revelations that will be possible with the world’s most powerful radio observatory. SKA-Low is one of two telescopes under construction by the SKA Observatory (SKAO), co-hosted in Australia and South Africa on behalf of its member states and the global community.
The image shows an area of sky of about 25 square degrees, equivalent to approximately 100 full Moons. In it are around 85 of the brightest known galaxies in that region, all of which contain supermassive black holes. When complete, the same area of sky will reveal much more. Scientists calculate the telescope will be sensitive enough to show more than 600,000 galaxies in the same frame.
The image was produced using data collected from the first four connected SKA-Low stations, which together comprise the first 1,024 of SKA-Low’s two-metre-tall metal antennas. They were installed over the past year at Inyarrimanha Ilgari Bundara, the CSIRO Murchison Radio-astronomy Observatory on Wajarri Yamaji Country, and account for less than one percent of the full telescope.
SKA-Low Lead Commissioning Scientist Dr George Heald said he was delighted to see how well the first four stations were working together.
“The quality of this image was even beyond what we hoped for using such an early version of the telescope,” he said.
“The bright galaxies we can see in this image are just the tip of iceberg. With the full telescope we will have the sensitivity to reveal the faintest and most distant galaxies, back to the early Universe when the first stars and galaxies started to form. This is technically difficult work and the first step to unlocking the awesome science that will be possible.”
SKA-Low Telescope Director Dr Sarah Pearce said the team had achieved stellar results.
“This is the culmination of effort from many talented and committed people across teams, organisations and continents,” she said. “Getting to this point has taken engineers, astronomers and computer scientists from all over the world, working for decades.”
“It’s amazing to see all this work come together to give our first glimpse of the brilliant images that will come from SKA-Low, promising us a view of the Universe we’ve never seen before,” added Pearce.
The SKA telescopes – SKA-Low in remote Western Australia and its counterpart SKA-Mid in South Africa’s Northern Cape, are arrays that combine the data captured by individual antennas spread over large distances, working together as one big telescope.
SKAO Director-General Professor Philip Diamond said the image illustrated the dawn of the Observatory as a science facility.
“With this image we see the promise of the SKA Observatory as it opens its eyes to the Universe,” he said. ”This first image is a critical step for the Observatory, and for the astronomy community; we are demonstrating that the system as a whole is working. As the telescopes grow, and more stations and dishes come online, we’ll see the images improve in leaps and bounds and start to realise the full power of the SKAO.”
The SKA telescopes are being constructed in stages, with components coming from SKAO member countries around the world.
In Australia, SKA-Low is being built in collaboration with Australia’s national science agency, CSIRO. It will scale significantly to become the world’s largest low-frequency radio telescope within the next two years, part-way through construction.
The observatory site has been established with the support of the Australian and Western Australian governments.
