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Astronomers at the Massachusetts Institute of Technology (MIT) and universities in Canada and the United States say they have detected a radio signal from a distant galaxy that is blinking frequently.
The scientists say in a paper published in the journal Nature, which was co-authored by members of the Canadian Hydrogen Intensity Mapping Experiment (CHIME)/FRB Collaboration. Fast Radio Blast (FRB) It is located a few billion light years from Earth.
CHIME is an interferometric radio telescope at the Dominion Astrophysics Observatory in British Columbia, Canada. It was designed to detect radio waves emitted by hydrogen in the early stages of the universe, and has detected hundreds of FRBs.
FRBs are millisecond-long flashes of radio waves that can be seen billions of light years away. FRBs were first discovered 15 years ago; Hundreds of similar radio flashes have been detected, although most FRBs were observed only once.
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A star consisting of a compressed neutron star, a star made up of compressed neutrons, is believed to be the remnant of a supernova explosion.
(Foto: QAI Publishing/Universal Images Group via Getty Images)
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what exactly FRB.source It, named FRB 20191221A, remains a mystery.
Astronomical scientist Let the signal frequency It could come from a magnetar or radio pulsar – a type of neutron star – “on steroids”. A neutron star is the dense, collapsing core of a giant star.
However, the duration of the 20191221A FRB is the most famous.
The wireless signal, captured in December 2019, lasted up to three seconds, or about 1,000 times longer than the average FRB.
“This is very unusual,” Danielle Mitchell, a postdoctoral researcher at MIT’s Kavli Institute for Astrophysics and Space Research, recalled in a statement. “It wasn’t very long, and lasted about three seconds, but there was a very accurate periodic peak, with every millisecond—boom, boom, boom—radiating like a heartbeat. This is the first time the same signal appears periodically. .” “
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It is currently the longest FRB with the clearest periodic pattern to date and the team has detected bursts of radio waves that repeat every 0.2 seconds with a different pattern.
Length (approx [3-second]) duration and the nine or more components that make up the pulse profile make this source deep into the FRB. Such a short periodicity provides strong evidence for the origin of neutron star events. Furthermore, our findings support emission originating from the neutron star magnetosphere, compared to emission regions located farther from the star, as predicted by some models.”
In addition, FRB 20191221A appears a million times brighter than radio emissions from our pulsars and magnetosphere.
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Composite image of cosmic cliffs in the Carina Nebula, created with NIRCam and MIRI instrument data from NASA’s James Webb Space Telescope, a revolutionary instrument designed to look across the universe until the dawn of the universe and released July 12, 2022.
(NASA, ESA, CSA, STScI, Webb ERO Production Team / Handout via REUTERS)
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“CHIME has now discovered many FRBs with different properties,” Micheli said. “We have seen some people living in very turbulent clouds, while others appear to be in a clean environment. From the characteristics of this new signal, we can tell that in the vicinity of this source, there is a plasma cloud that must be very turbulent.”
The team aims to detect more signals from this source, which MIT says is in a version that could be used as an “astrophysic clock” — and maybe even measure the expansion rate of the universe.
Future telescopes promise to detect thousands of FRBs per month, Micheli said, which could lead to “more periodic signals being detected.”
This announcement comes after the release of the first image of James Webb Space Telescopedating back billions of years.