Over 1,000 powerful cosmic explosions detected by FAST telescope in 47 days

An international research team led by Prof. LI Di and Dr WANG Pei of the National Astronomical Observatories of the Chinese Academy of Sciences (NAOC) detected an intense ring of cosmic explosions from Fast Radio Burst (FRB) 121102, using 500 meters. The spherical aperture radio telescope (FAST). A total of 1,652 independent bursts were detected in 47 days as of August 29, 2019 (UT).

This is the largest set of FRB events to date, more than the number reported in all other publications combined. This set of pulses is used to determine the characteristic power and power distribution of any FRB, thus illuminating the central motor that powers the FRBs.

These results were published in temper nature October 13, 2021.

FRBs were first discovered in 2007. These cosmic explosions can be as short as a millisecond while producing the equivalent of a year of the sun’s total energy output. The origin of FRBs remains unknown. Although aliens were also factored into the models for FRBs, the sightings clearly favor natural causes. Recently focused dots include exotic hypermagnetized neutron stars, black holes, and cosmic strings left behind by

Big Bang
The Big Bang is the leading cosmological model explaining how the universe as we know it began roughly 13.8 billion years ago.

“>le Big Bang.

FRB 121102 Pulse rate distribution of isotropic equivalent energy

1.25 GHz isotropic equivalent power burst rate distribution for FRB 121102. Credit: NAOC

Scientists have found that a small portion of FRB repeats itself. This phenomenon facilitates follow-up studies, including locating and identifying FRB host galaxies.

FRB 121102 is the first known iterator and the first well-translated FRB. Scientists have determined its origin in a dwarf galaxy. In addition, this FRB is clearly associated with a stable radio source. Both clues are crucial in solving the cosmic mystery of FRBs. The behavior of FRB 121102 is difficult to predict and is commonly referred to as “seasonal”.

While testing the background noise of the FAST FRB during the break-in phase, the team noticed that the FRB 121102 was operating with repeated light pulses. Between August 29 and October 29, 2019, 1,652 independent explosion events were detected in 59.5 hours. While the rhythm of the gusts varied throughout the series, 122 gusts were observed during the rush hour, which is the highest event rate ever observed for an FRB.

A river of shards of a galaxyA river of shards of a galaxy

A “river” of galaxy bursts as recorded by the FAST telescope. The number of pulses and energies are shown in the graphs, simulating Wang Shiming’s “Wide Land” painting of the Song Dynasty. credit: NAOC

Such a high tempo facilitates a statistical study of these bursts of FRB. Researchers have discovered a distinct energetic characteristic of E.= 4,8 x 1037 erg, below which burst generation has become less efficient. The energy distribution of the bursts can be rightly described as bimodal, i.e. a lognormal function for low emission bursts and a Lorentz function for high emissivity bursts, which implies that the weakest FRB pulses can be random in nature; and that the strongest pulses involve a relationship between two independent quantities.

“The total energy of this group of bursts already amounts to 3.8% of what is available from a magnetar and no periodicity has been found between 1 millisecond and 1000 seconds, which considerably limits the possibility that FRB 1211102 came from an isolated compact object, ”said Dr. Wang.

More than six new FRBs were discovered by the Commensal Radio Astronomy Rapid Survey (CRAFTS, https://crafts.bao.ac.cn/), including a new repeater similar to 121102. “As the largest antenna in the world , Professor LI said, FAST sensitivity has been shown to help reveal the intricacies of cosmic transients, including FRBs. ”

This project is part of a long-standing collaboration since the operational phase of the FAST telescope. Major partner institutions include Guizhou Normal University, University of Nevada Las Vegas, Cornell University, Max Planck Fuer Institute for Radio Astronomy, University of West Virginia, CSIRO, University of California to Berkeley and Nanjing University.

Reference: “Bimodal Burst Power Distribution of a Repeated Fast Wireless Burst Source” by D. Li, P. Wang, WW Zhu, B. Zhang, XX Zhang, R. Duan, YK Zhang, Y. Feng, NY Tang, S. Chatterjee, JM Cordes, M. Cruces, S. Dai, V. Gajjar, G. Hobbs, C. Jin, M. Kramer, DR Lorimer, C. Miao, C. Niu, JR Niu, ZC Pan, L. Qian, L. Spitler, D. Werthimer, GQ Zhang, FY Wang, XY Xie, YL Yue, L. Zhang, QJ Zhi and Y. Zhu, October 13, 2021 Available temper nature.
DOI: 10.1038 / s41586-021-03878-5

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