Potential supernova may actually be a black hole
DOI: 10.1063/PT.5.028444
Space.com : A bright object called SDSS1133, located just outside a dwarf galaxy known as Markarian 177, has long been thought to be a supernova. However, Michael Koss of the Swiss National Science Foundation has discovered that images of the object show that it has remained bright for more than 60 years, much longer than any known supernova. Recent observations have also revealed that SDSS1133 is getting brighter. Because supernovas tend to explode in a bright flash and then fade over time, Koss and his colleagues propose that SDSS1133 may actually be a black hole. It could have been created when two galaxies collided and their central black holes merged. To determine whether SDSS1133 is indeed a black hole, the researchers are looking for the presence of a specific form of carbon in the surrounding material.
