Cosmic Magnetic Field Map Reveals New Universe Secrets

The Cosmic Magnetic Breakthrough

A global team led by Australia's national science agency, CSIRO, has created the largest cosmic map of magnetic fields ever produced. By measuring light from nearly 4 million galaxies as it twisted and traveled through intergalactic space, researchers can now investigate fundamental questions about the physics of the universe and the galaxy we live in.

The Technology Behind the Discovery

The encyclopaedic chart, named "SPICE_RACS" (Spectra and Polarisation In Cutouts of Extragalactic Sources from the Rapid ASKAP Continuum Survey), was made possible by Australia's most powerful radio telescope array, the Australian Square Kilometre Array Pathfinder. Located at the Inyarrimanha Ilgari Bundara observatory in Western Australia, this instrument is capable of scanning immense areas of the sky and deep into the far reaches of distant galaxies.

Scientific Significance

Dr Alec Thomson, a CSIRO astronomer and astrophysicist, explained: "We still don't actually know how magnetic fields started in the universe, or how they've changed across time since the big bang. And so this type of map helps us start to answer those questions and be able to look at the details of the magnetic universe."

Advancing Previous Research

Prof Naomi McClure-Griffiths, an author of the paper and chief scientist of the Square Kilometre Array observatory, noted that previous efforts to map magnetic fields didn't even cover the southern sky. "For the past 20 years we have been working with essentially the same dataset," she said. "Now, we can finally answer some big questions with a much better picture of the universe's magnetic structures."

The Future of Cosmic Discovery

The dataset, which is five times larger and much more detailed than previous efforts, has been made available to scientists around the world. Prof Lisa Harvey-Smith, an astrophysicist at UNSW Sydney, emphasized that this open repository will enable numerous discoveries: "The result of creating the map is not the end product – the end product will be over the next few years with scientists dipping in and doing their own studies of particular star-forming regions or particular galaxies. And there'll be so many discoveries that flow on from this map."