2020-07-04

The scientific community announced that this is the first time humans have discovered a visible light explosion from a merged black hole

By ddzyx

This is the first time humans have observed visible light explosions from black hole merger!

In recent years, the merger of black holes in our universe has been discovered through ripples in space and time called gravitational waves. Now, for the first time, astronomers have observed visible light from the merger of black holes in a peculiar 3 black hole system.

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In recent years, scientists have observed two black holes surrounding each other Sometimes they spiral close together and then merge. Scientists have never seen such a merger, and what they observe is an elusive signal produced by the merger of black holes, called gravitational waves, which means ripples in time and space. At the same time, theorists have proposed ways in which black hole mergers may explode under visible light. This month, astronomers in California announced for the first time that they had seen one of them producing light.

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Evidence comes from the California Institute of Technology’s robotic Zwicky transient facility ( ZTF), located in Paloma Observatory near San Diego. ZTF’s job is to survey the night sky, and its task is to capture a large number of unknown rare flares and eruptions. On May 21, 2019, the ZTF machine telescope detected a flare generated by a distant and active supermassive black hole called J1249+3449 . This object is estimated to be 12.8 billion light years away. At about the same time, two gravitational wave detectors-the laser interferometer gravitational wave observatory (LIGO) and the European Virgo detector-also detected an event. They labeled the gravitational wave event as 190521g.

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Now, more than a year has passed, astronomers have done After careful analysis, the two events were coordinated and reviewed-one in visible light and one in gravitational waves. In the end, scientists think it is likely to come from the same black hole merge. Because these flares occur on the correct time scale and in the correct position, basically consistent with the gravitational wave event. So scientists concluded that flares are probably the result of the merger of black holes, but we cannot completely rule out other possibilities.

According to the scenarios described by these scientists, once two smaller black holes merge into a new black hole, this new black hole undergoes a”repulsion” activity, making it in the gaseous disk of the supermassive black hole Randomly flew inside. It was this repulsive activity that produced a bright flare. Astronomers believe that this flare is expected to start a few days to a few weeks after the initial gravitational wave generated during the merger. At that time, ZTF did not immediately capture this event, but when the scientists returned to view the ZTF archived images a few months later, they found a signal that started a few days after the gravitational wave event in May 2019. . ZTF observed that the flare slowly weakened over a month.

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Scientists are trying to make the light of supermassive black holes more detailed The observation, that is, the spectrum, but when they observe, the flare has gradually shown its legs. A spectrum can provide more support for the idea that flares come from the merger of black holes in a supermassive black hole disc. However, the researchers say they can largely rule out other possible causes of the observed flares, including supernovae or tidal rupture events, in which a black hole basically engulfs a star.

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Scientists believe that the new The black hole formed should cause another flare in the next few years. In a word:In recent years, the merger of black holes in our universe has been discovered through ripples in space and time called gravitational waves. Now, astronomers believe for the first time that they have observed visible light from the merger of black holes in a peculiar 3 black hole system. . This discovery will greatly promote our understanding of the black hole system.