"Astronomers from the International Centre of Radio Astronomy Research (ICRAR) have released an incredible image of the Milky Way shining in low-frequency radio light, revealing a spectacular realm invisible to the human eye - and indeed most telescopes. Made by meticulously stitching together thousands of observations over eighteen months, the epic mosaic shows a galaxy awash with the circular blotches of supernova remnants, the leftovers of a catastrophic explosion that destroys a star."
"The map is made from two surveys taken with the Murchison Widefield Array, a massive radio telescope in Australia comprising over 4,000 antennas spread across nearly three square miles. The first survey completed in 2015 called GLEAM imaged the entire southern night sky, and a follow-up survey, GLEAM-X, performed it again with a higher sensitivity three years later. To combine the thousands of observations, the team used a technique called image domain gridding to correct for the differences caused by the time between which the two surveys were taken."
A low-frequency radio mosaic of the Milky Way was created by stitching thousands of observations taken over eighteen months. The image reveals numerous circular blotches identified as supernova remnants and details of star formation and interaction across the galaxy. The map combines two surveys from the Murchison Widefield Array—the 2015 GLEAM survey and the higher-sensitivity GLEAM-X follow-up three years later. Image domain gridding corrected differences between observations taken at different times. Corrections for ionospheric distortions were applied to prevent apparent shifts in source positions. The Murchison Widefield Array comprises over 4,000 antennas spread across nearly three square miles.
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