The spectacular gamma radiation produced by the collapse of a dying star may change the understanding of the universe


A group of scientists in Namibia in southwest Africa recorded an amazing cosmic explosion, which is the brightest gamma radiation emitted by a collapsing star to date. They say these explosions usually occur when a massive star with a mass five to ten times the mass of the sun suddenly explodes and turns into a black hole. Scientists say that the gamma-ray burst (GRB) is one of the highest-energy radiation so far, and it is also the longest gamma-ray glow so far. 

It is also one of the closest gamma bursts to the earth in history, about 1 billion light-years away. In contrast, a typical GRB occurs approximately 20 billion light-years away. The team of scientists said that this observation challenges the established theory of gamma-ray bursts in the universe. In addition, this closeness of events means that scientists can see the “color” of radiation. Scientists were able to track the glow for up to three days after the initial explosion. 

They pointed out in a research paper published in Deutsches Elektronen-Synchrotron (DESY) that the results were surprising. According to the DESY website, its research center is one of the world’s leading particle acceleration facilities. It is part of the Helmholtz Society, Germany’s largest scientific organization. “Our observations reveal strange similarities between X-rays and the high-energy gamma rays emitted by the explosion glow,” said Silvia Zhu, assuming that the two emission components must be produced by different mechanisms. 

One of the established theories. According to the DESY Research Center, the incident was captured by the High Energy Stereo System (HESS) on August 29, 2019, after the Fermi and Swift satellites detected a radiation burst in the Bojiang constellation. Collapse and form a neutron star or black hole. Then the relativistic jet leaves the star and a supernova occurs. 

Then some matter is scattered and accelerated in the magnetic field surrounding the shock wave. About 900 million years later, the radiation from this gamma-ray burst reached the earth and was detected by satellites and telescopes (such as HESS). Gamma-ray bursts also occur when two ultra-high-density star bodies called neutron stars collide.

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