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Astronomers detect “strange” radio frequency emission bursts from distant galaxies

https://sputniknews.com/20220609/astronomers-detect-weird-radio-frequency-radiation-burst-from-galaxy-far-away-1096136273.html

Astronomers detect “strange” radio frequency emission bursts from distant galaxies

Astronomers detect “strange” radio frequency emission bursts from distant galaxies

Fast radio bursts (FRBs) are very short radiated bursts (duration of about 1 millisecond) that flare brightly at radio frequencies. … 09.06.2022, Sputnik International

2022-06-09T00: 08 + 0000

2022-06-09T00: 08 + 0000

2022-06-09T00: 08 + 0000

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A new study published in the journal Nature found a second example of a highly active and repetitive fast radio burst with a limited source of weak but persistent radio radiation between bursts, which was discovered by astronomers. Revealed “strange” nature. This discovery raises new questions about the nature of these mysterious energy pulses, and their usefulness as research tools for the nature of intergalactic space. Studies show that the first pulse discovered in 2019 was studied using the National Science Foundation’s Karl G. Jansky Super Large Array (VLA) and other telescopes. The pulse called FRB20190520B is China’s FAST (Five-100 meter spherical radio telescope). On May 20, 2019, Burst reached Earth and data from its telescope was discovered in November of that year. Unlike many other Feds, 20190520B is reported to emit frequently repeated radio bursts, according to follow-up observations. The location of the object was established by VLA measurements in 2020 and demonstrated in visible light studies with the Subaru Telescope in Hawaii. Being on the outskirts of a dwarf galaxy about 3 billion light-years away from Earth. According to VLA data, objects generate weak radio waves between bursts. According to Casey Law, a Caltech astronomer who was part of the research team, these features suggest that they resemble the first confirmed observations that are permanently active. Fed. The discovery was important because it provided the first information about the Fed’s environment and distance, according to scientists. However, the 2016 object, known as the Fed 121102, was distinguished from all other known Feds by a combination of repetitive bursts from a compact location and continuous radio emission between bursts. The difference between the Fed 20190520B and the Fed 121102, and everything else, supports the hypothesis that there are two types of the Fed, the researchers said. Astronomers speculate that the Fed can be created by two separate mechanisms, or by objects that function differently at different stages of their existence. The ultra-dense neutron stars that remain after a large star explodes as a supernova, or a neutron star with an ultra-strong magnetic field called a magnetar, are reported to be the most likely producers of the FRB. According to ScienceDaily, the effectiveness of the Fed as a tool is questionable by one feature of the Fed 20190520B to investigate substances between them and the Earth. Astronomers frequently study the effects of intervening substances on radio waves emitted by distant objects in order to better understand their flimsy substances. One such effect occurs when radio waves flow across a space containing free electrons. In this scenario, high frequencies travel faster than low frequencies. This effect, known as dispersion, can be studied to determine the electron density in space between an object and the Earth, or to provide an estimate of the distance to an object if the electron density is known or assumed. increase. This effect is often used to calculate the distance of a pulsar. The galaxy in which FRB20190520B occurs is estimated to be approximately 3 billion light-years away from Earth, according to an independent assessment based on the Doppler shift of the galaxy’s light caused by the expansion. universe. Burst signals, on the other hand, usually have a dispersion level that indicates a distance of 8 to 9.5 billion light-years. According to astronomers, FRB 20190520B may be a “newborn” and is still surrounded by dense material that was blown up by a supernova explosion that left behind neutron stars. The dispersion of the burst signal decreases as the material decomposes as well. According to them, in this scenario, recurring bursts are characteristic of the young Fed and can decline with age. One of the Fed’s most interesting features is that most of these explosions have been observed only once. Once it explodes, it disappears. As a result, it is nearly impossible to predict, track and examine them. The Fed identified in the Milky Way galaxy has been reported to come from a magnetar (a type of dead star), suggesting that the eruption of the magnetar is responsible for at least some Feds.

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Fast radio bursts (FRBs) are very short radiated bursts (duration of about 1 millisecond) that flare brightly at radio frequencies. Most of them come from distant galaxies, but our Milky Way has only one and is very bright. It instantly releases as much energy as 500 million suns.

According to new research, astronomers have discovered a second example of a highly active and repetitive fast radio burst with a limited source of weak but persistent radio radiation between bursts, revealing its “strange” nature. Revealed Release In Journal Nature.

This discovery raises new questions about the nature of these mysterious energy pulses, and their usefulness as research tools for the nature of intergalactic space. Studies show that the first pulse discovered in 2019 was studied using the National Science Foundation’s Karl G. Jansky Super Large Array (VLA) and other telescopes.

The pulse designated as FRB 20190520B was discovered by FAST (500m Spherical Radio Telescope) in China.

On May 20, 2019, Burst reached Earth and data from its telescope was discovered in November of that year. Unlike many other Feds, follow-up studies have reported that 20190520B emits frequently repeated radio bursts.

The position of the object was established by measuring with VLA in 2020. As a result, a study of visible light with the Subaru Telescope in Hawaii demonstrated that it is located on the outskirts of a dwarf galaxy about 3 billion light-years away from Earth. According to VLA data, objects generate weak radio waves between bursts.

According to Casey Law, an astronomer at the California Institute of Technology who was part of the research team, these features appear to resemble the first confirmed observations of the Fed’s sustained activity. It suggests that.

“With these characteristics, this is very similar to the first Fed, which was also positioned by the VLA in 2016,” Law said. Science daily report. “Now we have two like this, and that raises some important questions.”

The discovery was important because it provided the first information about the Fed’s environment and distance, according to scientists. However, the 2016 object, known as the Fed 121102, was distinguished from all other known Feds by the combination of repeated bursts from a compact location and continuous radio emission between bursts.

Researchers say that the differences between the Fed 20190520B and the Fed121102, and everything else, support the hypothesis that there are two types of the Fed. Astronomers speculate that the Fed can be created by two separate mechanisms, or by objects that function differently at different stages of their existence. The ultra-dense neutron stars that remain after a large star explodes as a supernova, or a neutron star with an ultra-strong magnetic field known as a magnetar, are reported to be the most likely producers of the FRB. ..

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According to ScienceDaily, the Fed’s effectiveness as a tool for investigating matter between the Fed and the Earth is questioned by one function of the Fed20190520B.

Astronomers frequently study the effects of intervening substances on radio waves emitted by distant objects in order to better understand their flimsy substances. One such effect occurs when radio waves flow across a space containing free electrons. In this scenario, high frequencies travel faster than low frequencies. This effect, known as dispersion, can be studied to determine the electron density in space between an object and the Earth, or to provide an estimate of the distance to an object if the electron density is known or assumed. increase. This effect is often used to calculate the pulsar distance.

An independent assessment based on the Doppler shift of galaxy light caused by the expansion of the universe estimates that the galaxy in which FRB 20190520B occurs is approximately 3 billion light-years away from Earth.

Burst signals, on the other hand, usually have a dispersion level that indicates a distance of 8 to 9.5 billion light-years.

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According to astronomers, FRB 20190520B may be a “newborn” and is still surrounded by high-density matter blown up by a supernova explosion that left behind neutron stars. The dispersion of the burst signal decreases as the material decomposes as well. According to them, in this scenario, recurring bursts are characteristic of the young Fed and can decline with age.

One of the Fed’s most interesting features is that most of these explosions have been observed only once. It appears out of nowhere, explodes once, and then disappears. As a result, it is nearly impossible to predict, track and examine them.

The Fed identified in the Milky Way galaxy has been reported to come from a magnetar (a type of dead star), suggesting that the eruption of the magnetar is responsible for at least some Feds.

https://sputniknews.com/20220609/astronomers-detect-weird-radio-frequency-radiation-burst-from-galaxy-far-away-1096136273.html Astronomers detect “strange” radio frequency emission bursts from distant galaxies

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