THE heart of our Milky Way galaxy is blinking at us, according to scientists. Mysterious signals from Sagittarius A, a huge black hole at the centre of our galaxy, were picked up by one of the world’s most powerful telescopes. In a new study, experts at Keio University in Japan outline how the strange, repeating signals may form. “This emission could be related with some exotic phenomena occurring at the very vicinity of the supermassive black hole,” team member Professor Tomoharu Oka said. Researchers studied readings of Sagitarius A (Sag A) taken in 2017 by the Atacama Large Millimeter/submillimeter Array (ALMA). They found a previously-undiscovered light signal coming from the supermassive black hole, which is four million times as massive as our Sun.The burst of energy likely originated from a region of swirling hot gas around Sag A known as its accretion disk. Activity appears to stem from the innermost edge of the disk. The edge is close to the black hole, which is spinning gas and debris around at close to the speed of light. During this process, random “hot spots” appear that flash millimeter and submillimeter light – the signal detected by the scientists.What is a black hole? The key… Read full this story
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