"China Eye" will be ascended to "Nature": "Shooting" fast radio radio radio ranceling near the environment, obtaining multiple "world first"

The "China Eye" observation results have once again appeared on "Nature" magazine. Using the "China Sky Eye" FAST Telescope, the National Observatory of the Chinese Academy of Sciences and scholars of Peking University and the University of Nevada University in the United States observed a fast radio violence. The magnetic field change in the surrounding environment recently. The results were published at "Nature" magazine at 23:00 on September 21, 2022.

Fast radio violence (FRB) is an occasional radio explosion in the universe. The energy band energy released within a few milliseconds can be equivalent to tens of billions of times of total power generation in the world. In 2007, scientists reported FRB for the first time and have found hundreds of them so far. However, due to the short research time and limited observation sensitivity, astronomers are still unclear about the physical origin and central mechanism of fast radio storms.

"In the past, we could only observe the environmental conditions of several light years around FRB and dozens of light years. This time, thanks to Fast's ultra -high sensitivity, we observed a astronomical unit around the FRB center (the distance from the sun to the earth, The environmental changes of about 150 million kilometers) have created the "International's first" of multiple FRB observations. "Li Keja's work of the paper communication author Li Keja spanned the Department of National Observatory and Peking University Astronomy. He told reporters that this research The object is a new event FRB 20201124A discovered by Canadian astronomers in 2020. It is about 1.5 billion light years from the earth. It is determined that it may be repeated violence. The research team has continuously observed it with FAST on April 1, 2021.

▲ This result art map: fast radioactive storm and host galaxy art imagination. The world's largest single -caliber radio telescope China Tianyan (bottom left) and the highest -caliber optical telescope (upper right) with the highest space resolution of the space resolution to undertake this research observation. (Drawing: Yu Jingchuan, Fu Hai)

What surprises the scientific research team is that this FRB daily signal data is changing drastically. Therefore, their team did not end the observation until June 11, a few days after their signal "extinguished". In a total of 82 hours of observation in 54 days, it obtained 1863 explosive pulse signals from the FRB. This is by far the largest to date Express radio electrical storm margin observation sample. Scientists have come to a series of results of subversion of previous cognition.

First of all, the research team "filmed" the "movie" that dynamically evolved the Dynamic evolution of FRB Faraday rotation (to assist the magnetic field strength in the measurement environment). "For the first time, we discovered the strange evolution of Faraday's rotation volume. It will have no regular and short -term standard evolution in the first 36 days, and it is almost unchanged in the following 18 days." Based on the year as a unit, I have never seen this time. This time, astronomers also discovered FRB's hate -FRB 20201124A was very active at first, and then suddenly went out of 72 hours.

▲ The short -term standard of Faraday rotation volume evolved. Fast observations are observed, but the outbreak of FRB is not detected, indicating that FRB suddenly goes out.

In addition, astronomers first detected the high -circular polarization pulse that was significantly different from all FRBs before this FRB, and its maximum value reached 75%. It also found the phenomenon of polarizing oscillation of frequency dependencies for the first time. In the past, the astronomy community believed that the polarization of FRB was a line oscillation. This time, it was discovered that the previous cognition was subverted. At the same time, these phenomena also show that the environment close to the FRB center is very complicated and evolved dynamically.

▲ The oscillation phenomenon of the line/round polarization and polarizing position angle detected in FRB 20201124A.

Through international cooperation, the team also used the 10 -meter Kakkuki Telescope (KECK) to deeply observe the host galaxy of FRB 20201124A. The stars have low density.

▲ The team's spectrum and high -resolution imaging observation of FRB20201124A's host galaxy through the KECK telescope observation.

"The previously detected FRB was mainly outside the Milky Way. People thought that FRB should exist in areas with a large star density in galaxies. This discovery shows that the FRB does not originate from the super -bright supernova or supernova or the star or the extreme star explosion caused by the extreme star explosion or Young Magnetic Star formed after gamma rays. "East Su Bo, a researcher at the Institute of Astronomy and Celestial Physics of Peking University, said that this provides new clues for human understanding of the origin of FRB.

At present, nearly a hundred people in China Eye Fast Fast Fast Radio -Storm are closely cooperating with the scientific research team of major projects, and they are looking forward to finding direct observation evidence that decide the core physical process and energy mechanism of fast radio violence, guide the joint observation of international multi -bands, and reveal the physical physical physics of fast radio storms sooner. origin.

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Author: Xu Qimin

Photo: Provided by the respondent

Editor in charge: Ren Quan

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