Astronomers reveal the secret of instant radio bursts

A five-meter five-meter apothecary spherical radio telescope (FAST) in China. Credit: Bojong Wang, Jinchen Jiang and Kisehe Ngui

UNLV astronomers Bing Zhang contribute to the understanding of the mechanisms of rapid radio explosions in three papers published in nature.

Rapid Radio Explosion or FRBs – Strong, milliseconds of time Radio waves come from the deep outside Milky Way Galaxy – One of the most mysterious astronomical phenomena ever observed. FRBs were first discovered in 2007 by astronomers around the world using radio telescopes to monitor the explosion and find clues as to where it came from and how it was produced.

UNLV astronomer Bing Zhang and his international collaborators have recently discovered these mysterious sources, which led to a series of findings in the journal. Nature Finally, it can shed light on the physical structure of FRBs.

The first paper is Zang’s co-author and leading theologian. Published in the October 28 issue Nature.

“There are two major questions about the origins of the FRB,” said Zhang, who observed his team using a five-meter-wide Apterur spherical telescope in China. “The first is what are the engines of FRBs and the second is the method of producing FRBs. We find the answer to this second question in this paper.

Two competing theories have been proposed to interpret the FRBs method. One theory is that the most powerful explosions in the universe are similar to the gamma-ray explosion (GRB). The other concept is more similar to a radio pulse that rotates neutron stars that emit brighter and more balanced radio particles. Models such as GRB predict a constant polarization angle during each explosion sar liner– Similar models predict polarization angle differences.

The team used FAST to look for a recurring FRB source and then found 11 explosions. Interestingly, seven of the 11 bright explosions showed different polarization angles during each explosion. The angles of polarization were not only different in each explosion, but also different patterns of volcanoes.

K-J. “Our observations are fundamentally against GRB-like models and support for pulsary-like models,” he said. Lee from Cavili Institute of Astronomy and Astrophysics, Peking University and associate paper author.

Four other papers on FRBs have been published in Nature Linn November 4: These include a number of research papers published by the FAST team led by Jang and national astronomers from China and Peking University. Researchers related to the Canadian Hydrogen Map Map (CHMA) and the Intercontinental Radio Release 2 (STARE2) team also collaborated on the publications.

“Just as the first paper raised our awareness of the mechanism behind the FRBs, these papers unraveled their mysterious origins,” Zhang said.

Magnets are incredibly dense, urban-sized neutron stars with the most powerful magnetic fields in the universe. Magnets occasionally produce short X-ray or soft gamma-ray blasts through the distribution of magnetic fields, so they are considered to be compelling sources of energy for FRBs during high-intensity explosions.

The earliest evidence of this is that on April 28, 2020, a magnificent radio explosion occurred in the Milky Way galaxy about 30,000 light-years from Earth, from a magnet placed in our backyard. As expected, the FBC was associated with a bright X-ray.

“We now know that the most powerful magnets in the universe can produce at least some or perhaps all FRBs,” says Zhang.

The show featured two small radio telescopes, CHIME and STARE2, which agreed to distinguish bright events from many other celestial bodies.

Zang’s team has been using FAST for some time to look at the source of the magnet. Unfortunately, the FBC is not looking at its immediate source. However, Fast reported some interesting “ignorance” discoveries on November 4. Nature Articles There were 29 other X-rays released during the FAST observation campaign. However, none of these explosions were accompanied by radio explosions.

“Our investigations and tests of the CHIME and STARE2 teams will refine the full picture of the FRB-magnetar associations,” Zhang said.

Zhang also worked together to put it all in perspective Nature Publish a one-author review of various discoveries and implications for the field of astronomy.

“Thanks to recent observations, FRB’s theories can be thoroughly evaluated,” Zhang said. “The production methods of FRBs are very narrow. But there are still many obvious questions. This will be an exciting field for years to come. ”

Reference: “Rapid Radio Explosion Physical Techniques” by Bing Zhang, ed. 4 November 2020, Nature.
Doy: 10.1038 / s41586-020-2828-1

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