Why Do Black Holes And Galaxies Spin?

Astronomers have found a new way of measuring the spin in supermassive black holes, which could lead to better understanding about how they drive the growth of galaxies. The scientists at Durham University, UK, publish their work in a paper in the Oxford University Press journal Monthly Notices of the Royal Astronomical Society. The team of astronomers observed a black hole - with a mass 10 million times that of our Sun - at the center of a spiral galaxy 500 million light years from Earth while it was feeding on the surrounding disc of material that fuels its growth and powers its activity. By viewing optical, ultra-violet and soft x-rays generated by heat as the black hole fed, they were able to measure how far the disc was from the black hole.



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