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NASA's Fermi telescope has confirmed gamma-ray emissions from SN 2017egm, a superluminous supernova powered by a magnetar, validating theoretical models of magnetar wind nebulae. This detection, achieved after nearly two decades of data analysis, provides critical constraints on high-energy astrophysical processes and informs future observational strategies for instruments like the Cherenkov Telescope Array.
Fermi Detects Gamma Rays From a Supernova 400× More Luminous
NASA’s Fermi Gamma-ray Space Telescope observed a rare, luminous supernova, likely powered by a supermagnetized neutron star.
After nearly 20 years of searching Fermi data for definitive signals, astronomers have finally detected gamma rays from a supernova exhibiting an unusually powerful burst of energy. NASA’s Fermi Gamma-ray Space Telescope observed SN 2017egm, a superluminous supernova located 440 million light-years away, producing 10 or more times the amount of visible light normally seen. The gamma rays detected by Fermi occurred from July 5, 2017, to October 25, 2017, corresponding to 43 to 155 days after the supernova’s discovery, suggesting the explosion was powered by a supermagnetized neutron star formed in the star’s collapse. The team performed a deeper analysis to compare how well different models reproduced the observed…
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