"China Sky Eye" re -enables fast radio power to reveal the secrets and go further

In the vast universe, there will be a raw electricity critical attack, just a few milliseconds. Who issued these radio storms? What information do they include? In the past ten years, astronomers have been exploring the truth.

Relying on the "Fast), Chinese researchers have observed the outbreak of nearly 2,000 times of repeated fast -moving radio violence FRB20201124A, and obtained the largest fast -moving radio violence margin observation sample to date. They found that this fast radio violence was in a very complicated dynamic evolutionary strong magnetic field environment, and for the first time, it was detected that a magnetic field change in a astronomical unit (that is, the distance from the sun to the earth) around the fast radio violence was detected. These findings show that FRB 20201124A is very active, and it may come from a double -star system, which takes a key step towards the mechanism of determining the rapid radio storm. Related results were published online on September 21 in "Nature" and "Nature · Communication" magazines.

Fast radio violence is a fierce outbreak of radio power in the vast universe. It lasts extremely short, usually only a few milliseconds.

Don't underestimate these millisecond flashes. Although it exists very short, its energy is particularly high. In these few milliseconds, it can release the power of tens of billions of years on the planet in the form of radio waves.

Since the first fast radio violence in 2007, astronomers have discovered hundreds of rapid flashing from the vast universe. However, "the origin and energy mechanism of fast radiation storms are one of the biggest puzzles of today's literature, and scientists have been arguing about this." Li Keja, a researcher at Peking University/Chinese Academy of Sciences, emphasized.

Initially, the fast radio violence detected by astronomers mainly came from outside the galaxy. In 2020, astronomers detected fast radio storms from the Magnah Magnetic Star (that is, a neutron star with a strong magnetic field). "This shows that some fast radio violence originated from magnetic stars, but the origin of fast radio storms from outside the galaxy is still unknown. At the same time, although fast radio storms have a large number of observation materials in radio power bands, the astronomical circles have been in the core area of ​​their core areas for a long time. Direct observations are still very little. "Li Keja admitted.

Using Fast, the research team conducted long -term monitoring of FRB20201124A. "In the 82 -hour observation of 54 days, we measured the 1863 explosive pulse signals from this fast radio storm. Its high explosion rate made it one of the most active repeated violence." Li Keja said.

Through the in -depth observation of this fast radio violence, the research team obtained several important discoveries, all of which are the first international internationally.

They "filmed" the "movie" that dynamically evolved in Faraday rotation of fast radio violence. "Faraday rotation can help us measure the strength of the magnetic field in the cosmic environment," Li Keja explained. For the first time, they discovered the strange evolution of Faraday rotation volume, that is, in the first 36 days, the Faraday rotation caused irregular short -term changes, and it was almost unchanged in the subsequent 18 days.

At the same time, the research team discovered the hate of fast radio storm, that is, the FRB 20201124A has maintained a high explosion rate in the early stage, and then suddenly extinguished within 74 hours. In this regard, Li Koga explained: "We have been continuously observed the fast radio violence every day or two days, one or two hours of observation, and suddenly one day this fast radio violence cannot be seen, and then continue to continue. It was observed for 15 days and did not find its signal. It suddenly disappeared the distance between the last observation of 74 hours. "

"For the first time, we also measured the phenomenon of fast radio violence polarization with the length of electromagnetic waves. These phenomena showed that the environment within a day and ground around this fast radio violence was very complicated and dynamically evolved." Li Koga said said Essence

In addition, through international cooperation, the research team used the 10 -meter Kake optical telescope to conduct in -depth observation of the host galaxy of this fast -moving electric storm. Common communication author and professor of Peking University, Dong Su Bo, said that they found that their host galaxy was a galaxy -based galaxy of the galaxy.

More importantly, researchers also found that the star density of the area of ​​this Express Electric Storm is low, not far from the center of the galaxy.

"We believe that this environment is inconsistent with the super -bright supernova model caused by the extreme explosion of large -quality stars, and it is also not consistent with the young magnetic star model formed after the Gamma rays." Provided new understanding.

Where does this fast radio violence come? Wang Fayin, the first author of "Nature · Communication" and the author of the communications author and professor of Nanjing University, said that the team he led first discovered the magnetic field around FRB 20201124A. Similarly, we believe that FRB 20201124A may produce a double star system composed of magnetic stars and BE stars (hotter than the sun, larger, and faster stars). "

In the model constructed by the Wang Fayin team, the evolution of the Faraday rotation volume was generated by fast radio violence radiating through the BE star disk. When the magnetic star moved between the star and the observer, the magnetic field around the FRB 20201124A changed the direction.

"This study provides important clues for the origin of fast radio ritors, that is, some fast radio storms may originate from the double star system." Wang Fain said.

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