Pawsey’s Galaxy Supercomputer Aids Telescope in Creating New Atlas of the Universe

December 2, 2020

Dec. 2, 2020 — The Australian Square Kilometre Array Pathfinder (ASKAP), developed and operated by Australia’s national science agency, CSIRO, mapped approximately three million galaxies in just 300 hours.

The Rapid ASKAP Continuum Survey is like a Google map of the universe where most of the millions of star-like points on the map are distant galaxies—about a million of which we’ve never seen before.

CSIRO Chief Executive Dr. Larry Marshall said ASKAP brought together world-class infrastructure with scientific and engineering expertise to unlock the deepest secrets of the universe.

“ASKAP is applying the very latest in science and technology to age-old questions about the mysteries of the universe and equipping astronomers around the world with new breakthroughs to solve their challenges,” Dr. Marshall said.

“It’s all enabled by innovative receivers developed by CSIRO that feature phased array feed technology, which see ASKAP generate more raw data at a faster rate than Australia’s entire internet traffic.

“In a time when we have access to more data than ever before, ASKAP and the supercomputers that support it are delivering unparalleled insights and wielding the tools that will underpin our data-driven future to make life better for everybody.

Credit: CSIRO

“Minister for Industry, Science and Technology, Karen Andrews said ASKAP is another outstanding example of Australia’s world-leading radio astronomy capability.

“ASKAP is a major technological development that puts our scientists, engineers and industry in the driver’s seat to lead deep space discovery for the next generation.

This new survey proves that we are ready to make a giant leap forward in the field of radio astronomy,” Minister Andrews said.

The telescope’s key feature is its wide field of view, generated by new CSIRO-designed receivers, that enable ASKAP to take panoramic pictures of the sky in amazing detail.

Using ASKAP at CSIRO’s Murchison Radio-astronomy Observatory (MRO) in outback Western Australia, the survey team observed 83 percent of the entire sky.

The initial results are published in the Publications of the Astronomical Society of Australia.

This record-breaking result proves that an all-sky survey can be done in weeks rather than years, opening new opportunities for discovery.

The new data will enable astronomers to undertake statistical analyses of large populations of galaxies, in the same way social researchers use information from a national census.

“This census of the universe will be used by astronomers around the world to explore the unknown and study everything from star formation to how galaxies and their super-massive black holes evolve and interact,” lead author and CSIRO astronomer Dr. David McConnell said.

With ASKAP’s advanced receivers the RACS team only needed to combine 903 images to form the full map of the sky, significantly less than the tens of thousands of images needed for earlier all-sky radio surveys conducted by major world telescopes.

“For the first time ASKAP has flexed its full muscles, building a map of the universe in greater detail than ever before, and at record speed.

We expect to find tens of millions of new galaxies in future surveys,” Dr. McConnell said.

The 13.5 exabytes of raw data generated by ASKAP were processed using hardware and software custom-built by CSIRO.

The Pawsey Supercomputing Centre’s Galaxy supercomputer converted the data into 2-D radio images containing a total of 70 billion pixels.

The final 903 images and supporting information amount to 26 terabytes of data.

Pawsey Executive Director Mark Stickells said the supercomputing capability was a key part of ASKAP’s design.

“The Pawsey Supercomputing Centre has worked closely with CSIRO and the ASKAP team since our inception and we are proud to provide essential infrastructure that is supporting science delivering great impact,” Mr Stickells said.

The images and catalogs from the survey will be made publicly available through the CSIRO Data Access Portal and hosted at Pawsey.


Source: Annabelle Young, CSIRO

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