Black Hole Spin Cranks-Up Radio Volume
Black holes absorb light and all other forms of radiation, making them impossible to detect directly. But the effects of black holes, in particular accretion disks where matter is shredded and superheated as it spirals down into the black hole, can release enormous amounts of energy. The accretion disks around supermassive black holes (black holes with masses millions of times that of the Sun) are some of the brightest objects in the Universe.
A team led by Dr. Andreas Schulze at the National Astronomical Observatory of Japan investigated the possibility that the spin of the supermassive black hole might play a role in determining if the high-speed jets form. Because black holes cannot be observed directly, Schulze’s team instead measured emissions from oxygen ions [O III] around the black hole and accretion disk to determine the radiative efficiency; i.e. how much energy matter releases as it falls into the black hole. From the radiative efficiency they were able to calculate the spin of the black hole at the center.
By analyzing nearly 8000 quasars from the Sloan Digital Sky Survey, Schulze’s team found that on average the O III oxygen emissions are 1.5 times stronger in radio loud quasars than in radio quiet quasars. This implies that spin is an important factor in the generation of jets.
Schulze cautions, “Our approach, like others, relies on a number of key assumptions. Our results certainly don’t mean that spin must be the only factor for differentiation between radio-loud and radio-quiet quasars. The results do suggest, however, that we shouldn’t count spin out of the game. It might be determining the loudness of these distant accreting monsters.”
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