Over 1000 space explosions detected in 47 days

By | October 13, 2021
Florida News Times

FAST from FRB121102 captures the actual pulse. credit: NAOC

An international research team led by Professor LiDi and Dr Wang Pei from the National Astronomical Observatory of China (NAOC) used 500 meters from a fast radio burst (FRB) 121102 to capture an extreme episode of a space explosion. Aperture Spherical Radio Telescope (FAST). A total of 1,652 independent eruptions were detected within 47 days of August 29, 2019 (UT).

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This is by far the largest set of Fed events, which exceeds the combined number reported in all other publications. Such burst sets allow the specific energy and energy distribution of the feds to be determined for the first time, thus shedding light on the central engine powering the feds.

the outcome . were published in Nature 13 October 2021.

The Fed was first revealed in 2007. These space explosions can occur in a thousandth of a second, which is a year’s worth of the Sun’s total energy output. The origins of the Fed are still unknown. Aliens are also considered in Fed’s model, but natural causes are clearly supported by observations. Recent focus has included exotic supermagnetization neutron stars, black holes, and cosmic stars left over from the Big Bang.

Scientists have found that a small fraction of the Fed repeats itself. This event facilitates follow-up, including the detection and identification of the Fed’s host galaxy.

Fed 121102 was the first known repeater and the first fully localized Fed. Scientists have confirmed that the dwarf galaxy originated. In addition, this fed is clearly connected to a permanent source of radio waves. Both clues are vital to solving the cosmic mystery of the Fed. The behavior of FRB 121102 is difficult to predict and is usually described as “seasonal”.

  • More than 1000 space explosions detected in 47 days by FAST

    Direct distribution of isotropic equivalent energy at 1.25 GHz for FRB121102. credit: NAOC

  • More than 1000 space explosions detected in 47 days by FAST

    A bursting “river” from the Milky Way as recorded by the FAST telescope. The number and energy of the explosions are displayed in a histogram, which mimics the Song Dynasty imperial western gate painting, “The Vast Land”. credit: NAOC

While testing the FAST FRB backend during the commissioning phase, the team noticed that FRB 121102 was frequently operating with fast pulses. Between August 29 and October 29, 2019, 1,652 independent burst events were detected in a total of 59.5 hours. The order of bursts changed over the course of the series, but 122 bursts were observed during peak hours. This corresponds to the highest incidence rate the Fed has ever seen.

Such high cadence facilitates statistical study of these fed eruptions. Researchers E. A distinctive feature of energy is discovered0= 4.8 × 1037 If it is less than erg, the burst generation efficiency will be reduced. The burst energy distribution can well be described as bimodal, that is, a low e-burst lognormal function and a high e-burst Lorentz function. This means that weak fed pulses are stochastic in nature and strong ones have two ratios. free amount.

“The total energy of this burst set reached 3.8% of the energy received from the magnetar, with no periodicity between 1 ms and 1000 seconds, both obtained from the compact object in which FRB121102 is isolated. This severely limits the possibilities.” limits,” Dr. Wang said.

More than six new feds have been discovered through the Commons Radio Astronomy Fast Survey, including a new repeater like 121102. “The sensitivity of FAST, the world’s largest antenna, has proven to help uncover the complexity of travelers in the universe, including FED,” said Professor Li.

The project has been part of a long-standing collaboration since the commissioning phase of the FAST telescope. Major partner institutions include Guizhou Normal University, University of Nevada Las Vegas, Cornell University, Max-Planck-Institute for Radioastronomy, West Virginia University, CSIRO, University of California Berkeley and Nanjing University.


Fast radio helps elucidate origins of bursts


for more information:
Di Lee, Bimodal burst energy distribution of the sources of repeated high radio bursts, Nature (2021). DOI: 10.1038/s41586-021-03878-5.. www.nature.com/articles/s41586-021-03878-5

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Chinese Academy of Sciences

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