9/17/2023 0 Comments Flare 2 revit"The two black holes are so close to each other in the sky that one cannot see them separately they merge to a single point in our telescopes," Mauri Valtonen, an astronomer at the University of Turku in Finland who led the research, said in a statement. This indicated two black holes swirling around each other, with the shorter cycle being the orbital period and the longer cycle arising from the orientation of this orbit shifting over time. They identified two cycles - one of about 12 years and one of about 55 years. It was only after determining two different types of signals that astronomers were able to speculate about the true binary nature of this AGN.Īround four decades ago, Aimo Sillanpää, an astronomer at the University of Turku in Finland and co-author of the new research, and his colleagues noticed a prominent pattern in the emission of OJ 287. Though this quasar had been well studied, the black holes had appeared as a single merged dot in observations. OJ 287, which lies in the direction of the constellation Cancer, was discovered over 120 years ago in photographic plates that showed the quasar at its heart.
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