An international group of astronomers discovered that a black hole in the center of the Galaxy Milky Way produces irregular flashes during long-term periods of time. This is reported in the article published in the MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY.
Supermassive black hole Sagittarius A * is a source of radi-x-ray and gamma radiation. It flashes daily, emitting radiation, which is 10-100 times brighter than ordinary signals. To determine the nature of mysterious radiation, the researchers analyzed the data for 15 years, collected by SWIFT spacecraft.
The results showed a high level of black hole activity from 2006 to 2008 and a sharp decline in activity over the next four years. However, after 2012, the frequency of flashes increased again, but regularities in these changes have not yet been identified. Astronomers in the future are calculated to determine whether variations are caused in radiation by passing near the black hole of gas clouds or stars or they are explained by other reasons.