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The dead star transmits radio signals to Earth

The Integral Telescope operated by the European Space Agency (ESA) detects the extremely powerful radio-wave lightning (FRB) coming from the star from the name SGR 1935 + 2154.

Simulate radio signals emanating from magnetic stars. Photo:

Recently, researchers discovered stars from SGR 1935 + 2154 emitting both X-ray and radio signals. The discovery of the ESA space telescope, which floats at an altitude of nearly 153,000 km above Earth to track radiation in space, is the first to reveal the relationship between magnetars and radio flashes. . The results of the study were published on July 27 in the journal Astrophysical Journal Letters.

“We detected high-energy carrier flashes of magnetars and X-rays with Integral on April 28,” said lead researcher Sandro Mereghetti at the Institute of Astrophysics (INAF – IASF) in Milan, Italy. “This is really an important discovery, helping to reveal the origin of this mysterious phenomenon”.

Magnetic stars are corpses with the strongest magnetic fields in the universe. They are a type of neutron star, the collapsed cores of giant stars with the masses of the Sun but the size of a city. When magnetic stars are active, they can produce extremely short pulses of high-energy radiation. These pulses typically last for less than a second but are billions of times brighter than the Sun.

Six years ago, researchers discovered SGR 1935 + 2154 away in Vulpecula, a weakly glowing constellation in the Milky Way, about 30,000 light years from Earth. At the end of April 2020, SGR 1935 + 2154, emitted a series of radio flashes.

“Integral automatically alerts radio stations around the world about detection in seconds,” Mereghetti said. “This allows the scientific community to act quickly and examine the sources of radio bursts in more detail. We have never observed radio flashes from stars before.”

Astronomers detected a flash of extremely bright short radio waves from the direction of SGR 1935 + 2154 via the CHIME radio telescope in Canada on the same day. Integral’s IBIS camera helps the team to pinpoint the origin of the lightning, according to study co-author Volodymyr Savchenko at the University of Geneva, Switzerland.

First discovered in 2007, radio flashes are one of the biggest unresolved mysteries in astronomy, and researchers still don’t know their nature. They lasted only a few milliseconds before disappearing and rarely reappearing, confusing researchers for years.

The team’s findings at ESA reinforce the hypothesis of radio flashes coming from magnetars. The study results also demonstrated that lightning waves from highly magnetic objects can be observed at radio wavelengths. Researchers will continue to explore the cause of the FRB signal in April.

(According to

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