Since its discovery in 2007, astrophysicists have been searching for the source of a powerful cosmic radio burst called FRB, which lasts only a few milliseconds. Now, three independent studies have confirmed that such signals observed in the Milky Way are from the magnetar SGR 1935 + 2154, a neutron star with a very strong magnetic field located 30,000 light years away.
Incoming call Fast radio burst (Federal Reserve Board Its English abbreviation: Fast radio burst) Was first discovered in 2007, when it was reviewing 2001 data provided by the Australian Radio Telescope. Although astronomers have been increasing their observations of these rare and short-lived “radioactive explosions” since then, the origin of this phenomenon and the underlying physical principles are still poorly understood.
Identifying the source of these bursts is challenging because they only last a few milliseconds and are therefore difficult to locate.Although extraterrestrial transmitters have even been proposed, most theories believe that they are caused by Neutron StarThe remains of a dense giant star left after a supernova explosion.
Author of three articles this week natural Report the signature of this signal detected by multiple ground and space telescopes in our own galaxy.Outburst is called Federal Reserve Board 200428 And come from Magnetar, A neutron star with a very strong magnetic field.
Neil Gellers Space Observatory on April 27, 2020 rapid ÿ Fermi Recorded multiple bursts of X-rays and gamma rays from the named magnetar SGR 1935 + 2154, Located 30,000 light years away from us in the constellation Vulpecula
On the second day, April 28, 2020 (hence the name FRB 200428), two ground-based telescopes pointed to that area of the sky and detected a radio explosion: Canadian Hydrogen Intensity Map Experiment (CHIME) with Transient Astronomical Radio Transmission 2 (STARE2) survey de EE UU.
The members of both groups are the authors of two of the studies. In a report signed by CHIME, it was confirmed that the galaxy mechanical body SGR 1935 + 2154 was the source of FRB 200428. In this case, the observations of STARE2 are consistent in this fast radio burst, which is also consistent with The X-ray explosion coincided. From the magnetar.
For its part, although this FRB is not directly registered, the Chinese telescope Five-hundred-meter aperture spherical telescope (FAST) Allows to set limits on radio flux during the 29 short bursts of high-energy gamma rays that are also emitted by electromagnetic waves, thereby providing insight into the background and events of these fast radio bursts.
El telescopio FAST (The Five-hundred-meter Spherical Aperture Telescope) en Guizhou, China. / Bojun Wang, Jinchen Jiang, Qisheng Cui
The results of the Chinese team were published in the third article. Researchers from the Institute of Astrophysics of Andalusia (IAA-CSIC) and other international centers also participated in the meeting. The study concluded that FRBs associated with other shorter gamma-ray bursts are “rare.”
Magnets are the source of FRB, but there may be other sources
One of the authors of this work and other reviews, Bing ZhangScientists from Nanjing University (China) and the University of Nevada (USA) said that although other possible sources have not been completely ruled out, magnetars can at least produce some fast radio bursts, perhaps all.
Also published in parallel articles naturalAstrophysicists Amanda Weltman and Anthony Walters from the University of Cape Town in South Africa cherish these new results on FRB and emphasize the importance of international scientific cooperation and covering the sky from multiple locations to achieve these results.
They also reported a possible mechanism that could explain how FRBs are formed: magnetars produce a Electronic “flares” And other charged particles collide with other previously emitted particles in less than a few milliseconds.Collision produces a Shock front Outwardly, this generates a huge magnetic field.
Then, the electrons revolve around the lines of magnetic force, which emits a burst of radio waves.In addition, the shock wave heats up the electrons, causing them to emit X-ray film, As scientists discovered when analyzing other events related to the burst FRB 200428.
The underlying mechanism of fast radio burst (FRB) formation. /A. Wiltman and A. Walters/Nature
CHIME cooperation: “Bright millisecond-level radio pulses emitted by the Milky Way’s magnetars”. Christopher Bochenek et al. “Fast radio bursts related to galactic magnetars”. Zhang Bing and others: “There is no pulse radio emission during the galaxy’s magnetar burst phase” comment: “The physical mechanism of fast radio pulse bursts.” A. Weltman and A. Walters: “A rapid broadcast broke out in our own galaxy”. natural, November 2020.