A gigantic sonic boom generated by a super-massive black hole has been found with NASA’s Chandra X-ray Observatory, along with evidence for a cacophony of deep sound. This discovery was made by using data from the longest X-ray observation ever of M87, a nearby giant elliptical galaxy. M87 is centrally located in the Virgo cluster of galaxies and is known to harbour one of the Universe’s most massive black holes.
https://chandra.harvard.edu/photo/2006/m87/