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Australian researchers have published SPICE-RACS, the largest and most detailed map yet of magnetic fields across the sky, produced from data gathered by the Australian Square Kilometre Array Pathfinder (ASKAP) at the CSIRO Murchison Radio-astronomy Observatory.
The work uses the Rapid ASKAP Continuum Survey (RACS) catalogue of nearly 4 million radio sources and isolates roughly 350,000 polarised sources to trace the direction and strength of magnetism through the southern sky.
The dataset is about five times larger than previous efforts and reveals the Milky Way at roughly ten times finer detail in places, showing regions where fields point toward or away from Earth.
Published in the Publications of the Astronomical Society of Australia, the SPICE-RACS products and images have been released publicly for global scientific use.
Authors say the map will help probe how magnetism shapes galaxy formation, star-formation rates, interactions such as the Magellanic Clouds’ influence on the Milky Way, and the origin and evolution of cosmic magnetic fields.







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