Black hole detected spinning at almost the speed of light
Four other objects did not bring surprises to the researchers, and the speed of their rotation around their axis turned out to be half that of Q2237 + 0305. To determine the angular velocity of quasars - supermassive black holes in the active nuclei of large galaxies, an original approach was used, which a team of scientists from the Oklahoma and Florida State Universities, as well as the United States Naval Academy, had previously developed. According to their theory, the radiation of the Fe Ka superionized iron line reflected from the accretion disk can carry information about the physical parameters of the substance incident on the black hole.
During observations, gravitational lensing was used: the effect that occurs when photons, on their way from the source to the observer, pass by a massive object - another black hole or a large star. In this case, when observing through a telescope, not one quasar or star will be visible, but five, and this picture is called the “Einstein cross”. Researchers found in the field of view of Chandra five objects necessary for testing their theory and were able to find out the speed of their rotation around its axis. Thus, their work became the first ever measurement of the physical parameters of matter in the immediate vicinity of the event horizon. The results of the study have yet to be verified by other methods, and the scientific work itself was published in The Astrophysical Journal and its preprint is available on the arXiv resource.I wonder how a nuclear reactor works and can robots build a house?
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