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eROSITA discovers a 'changing-look' Seyfert galaxy
- May 17, 2026 at 8:00 PM
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Astronomers have tracked a dramatic "changing-look" active galactic nucleus (AGN) whose central supermassive black hole appeared to switch off and then rapidly reignite. The galaxy, HE 1237−2252, dimmed in X-rays by a factor of 17 within just 18 months before recovering again. The paper outlining its analysis was uploaded to the arXiv preprint server on May 8.
Originally published at Phys.org