Astronomers have made a noteworthy discovery regarding the Seyfert galaxy HE 1237−2252, which exhibited a remarkable change in its active galactic nucleus (AGN).
The central supermassive black hole in this galaxy appeared to switch off, leading to a dimming in X-ray emissions by a factor of 17.
This phenomenon underscores the dynamic behavior of supermassive black holes, highlighting their complex nature in the universe.