9/16/2023 0 Comments Event horizon telescope paper(Center) The simulated image based on a general relativistic magneto-hydrodynamical simulation. This is the first time that a black hole's spin information has been obtained.įigure 2: (Left) The observed image of the black hole shadow of the super massive black hole in the center of M87. The asymmetrical shape of the photon ring indicates that the black hole spins such that the southern side is approaching us. This confirmed that the mass of the super-massive black hole at the center of M87 is 6.5-billion times that of the Sun. They performed several simulations with supercomputers considering general relativity and magneto-hydrodynamics, and they compared the observed results to the simulations. In one of the six papers of EHT results appearing in the Astrophysical Journal Letters, the mass and spin of this black hole are discussed by the EHT theoretical and simulation working group. Comparing the observed image to simulation results provides the mass and spin direction of the black hole. In addition, if the black hole is spinning, the black hole shadow and the photon ring should have asymmetrical shapes because space-time is dragged in the spin direction. What can we learn from this image taken by the EHT? The space-time around a black hole is distorted by its strong gravity. The size of the ring is only about 40 microarcseconds across - equivalent to measuring the diameter of a baseball on the surface of the moon from the Earth.ĭownload: , Figure 1: The first image of the shadow of the black hole in the center of M87 taken with EHT.
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