葡京官网

Science : A black hole may lurk at the heart of every galaxy

作者:车梨侠    发布时间:2019-02-27 08:07:04    

By Jeff Kanipe Toronto, Canada IT’S a rare galaxy that lacks a supermassive black hole at its centre, according to an international team of astronomers. What’s more, says the team, the mass of the supermassive black hole, believed to be a dormant quasar, appears to match that of its host galaxy. Using the Hubble Space Telescope and ground-based telescopes in Hawaii, Doug Richstone of the University of Michigan and colleagues measured the wavelength and intensity of the light coming from the central regions of 27 nearby galaxies. The data revealed that there were supermassive black holes at the centres of all 27 galaxies. The researchers then worked out the masses of the black holes by measuring the masses and velocities of the stars orbiting them. They found a strong correlation between the mass of a galaxy and the mass of its central supermassive black hole. Richstone suggests that the central black holes are “fossil quasars. We believe that most galaxies at one time burned brightly as a quasar.” He says the development of the black hole probably depended on the development of its host galaxy. Richstone admits that his conclusions may not apply to all galaxies. He says his group is suggesting only that supermassive black holes may be a common feature among most galaxies. “All we can do is extrapolate and argue about the physics. We think we’re starting to get a clue about the global picture [of black holes and galaxies], and it looks simple. What we seem to be discovering makes sense.” Charles Steidel, an astronomer at the California Institute of Technology in Pasadena and a researcher on the early Universe,

 

Copyright © 网站地图