A supermassive black hole erupted in X-rays, and its radio jets followed 300 days later

By combining roughly two decades of observations from NASA's Swift X-ray Telescope with radio monitoring, astronomers have caught a supermassive black hole at the heart of the Perseus Cluster suddenly flaring in X-rays, and about 300 days later, its powerful radio emission flared too. Their paper describing the connection between this black hole's accretion disk and the jets it launches was submitted to the arXiv preprint server on Aug. 13 and accepted for publication in the Astrophysical Journal Letters.