The catastrophic collapse of the magnetic field of giant stars causes gamma-ray bursts. Gamma-ray bursts are the most energetic eruptions in the universe, expelling huge jets of light-emitting plasma that spin through space to reach 0.99 times the speed of light.
When a giant star collapses into a spinning black hole Va. Afterglow can be detected by ground and space telescopes when a jet is pointed at Earth. Many astronomers prefer an explanation for gamma-ray bursts based on barium-jet models.
Which establish violent collisions between material that repeatedly explodes during an explosion and the material surrounding the star’s gamma-ray flash and then produces Fraglow.
A second hypothesis, called a magnetic model, holds that a primordial, massive magnetic field in the star collapses within seconds of the initial explosion, energizing the explosion.
Now, a research team led by University of Bath astronomer Nuria Jordana-Mitzons has found evidence to support the magnetic model.
Hubble’s observations show that GRB 190114C exhibited powerful emission when the collapsing star sat 5 billion light-years away in a very dense atmosphere in the middle of a light galaxy. NASA / ESA / Hubble / M. Image by Kornmasser.
Hubble observations show that GRB 190114C exhibited powerful emission when the collapsing star sat in a very dense atmosphere, right in the middle of a luminous galaxy 5 billion light-years away. Image credit: NASA / ESA / Hubble / M. Cornmasser.
In the study, Jordana-Mitzan and her colleagues investigated data found on a massive star that fell 5 billion light-years away in the galaxy. The researchers were informed of the star’s collapse after NASA’s Neil Gehles Swift Observatory detected a gamma-ray flare called GRB 190114C on January 14, 2019.
He noted a low level of polarization in the moments immediately after the stars fell in GRB 190114C, indicating that the star’s magnetic field was destroyed during the explosion. “From previous studies, we expect to detect polarization of up to 30% during the first hundred seconds after the eruption,” said Jordanana-Mitanans.
So we were surprised to measure just 7.7% less after one minute, and then suddenly drop to 2% soon after. It tells us that the magnetic fields collapsed destructively directly after the explosion, releasing their energy and feeding the bright light found in the electromagnetic spectrum.
Seconds after the Swift Observatory identified GRB 190114C, robotic telescopes based in the Canary Islands and South Africa received and retrieved the discovery information from NASA. Within a minute of the discovery, the telescopes were collecting emission data.
Professor Carole Bundell of the University of Bath said: Our innovative telescope system is completely autonomous and contains no humans. So they moved very fast and began monitoring the GRB shortly after its discovery by the Swift satellite.
It is remarkable that from the comfort of our homes, we were able to discover the importance of primitive magnetic fields in driving a cosmic explosion in a distant galaxy. The team’s article was published in the Astrophysical Journal.
Powerful Gamma-Ray Bursts
Titanic stellar explosions penetrate magnetic fields. GRB’s art print showing a beam of light from a bright blue center with a halo of light around it. GRB 190114C imprint of a highly energetic artist.
The unusually energetic gamma-ray burst (GRB) has prompted astronomers to rethink the role of the magnetic field in these massive stellar bursts. Observations made immediately after the blast suggest that the key features of its associated magnetic field have mysteriously disappeared.
A phenomenon that cannot be explained by current theories of how those fields develop further. On January 14, 2019, NASA’s pre-warning SWIFT satellite saw a gamma-ray flare from a massive explosion in a galaxy 4.5 billion light-years away.
Such luminosity occurs when a star’s iron core collapses into a stellar-mass black hole, producing two relativistic beams of strongly magnetized particles. These rays generate gamma rays through synchrotron radiation and, as they leave the collapsing nucleus.
The particles present in them collide with the circumstantial material that the star throws in the event of a stellar explosion.
The resulting shock creates an optical glow that can burn for months. As soon as Swift detected the explosion, designated GRB 190114C. It automatically alerted a large number of telescopes on the ground.
Within 32 seconds, the master binoculars were in place in the Canary Islands and South Africa and were recording after the blast. This quick response has become the standard within GRB astronomy.
But the data proved anything, but based on previous observations, astrophysicists expected the light from the glow to polarize, perhaps as much as 30 percent. However, the exact figure depends on the strength and structure of the GRB’s magnetic field.
However, the polymers in the master telescopes initially measured polarization of just 7.7 percent. A minute later, when the Liverpool Telescope in the Canary Islands began taking data on the explosion, the polarization had dropped to just two percent.
And remained at this marginal level for the remainder of the observations. This was not the only strange feature about GRB 190114C. When another installation in the Canary Islands. The Magic Telescope, began taking data on the afterglow.
It measured incredibly energetic emissions, in the terra-electron-volt (TEV) range, of Compton’s inverse scattering, which occurs when photons Colliding with electrons. Circumstantial material.
This is the first time that such high energy emission has been detected in a GRB.
Shock Physics – Image showing two galaxies with bright, pixelated stripes on a black background. Unusual neighborhood. The image from the Hubble Space Telescope from the GRB 190114C backgame, located 4.5 billion light away in an interactive galaxy.
In an article published today in The Astrophysical Journal, researchers led by Nuria Jordana of the University of Bath, UK, proposed a partial solution to the mystery surrounding GRB 190114C.
We speculate that the low polarization is caused by the destructive dissipation of magnetic energy.
Which destroys the sequence of the magnetic fields and, subsequently, the forces, Jordana tells the world of physics. The photos of her and her co-workers are one of the tremors that bounce off the circumstantial material.
Sometime in the 31 seconds before the observation began, a blast wave from the stellar explosion hit this material. The pure kinetic energy allowed the forward jet and shock to hit, but part of the wave was reflected, causing the so-called reverse shock.
Since the localized disturbance scratches the magnetic field of the direct shock in random bending, the direct shock is never polarized. However, the reverse shock still has to carry the magnetic field ejected by the newly formed black hole.
In the case of GRB 190114C, there seems to be something that the magnetic field stretches disastrously and throws its energy out of subsequent emissions, which would explain TEV’s unusually high energies.
Jordana and colleagues estimated that the weak polarization measured between 52 seconds and 109 seconds after the explosion was a remnant of the massive magnetic field emanating from the black hole.
The exact cause of the collapse of the magnetic field remains uncertain.
According to Jordan, although the findings suggest a “universal role” for the magnetic field in GRB, “the existence of the jet’s magnetic field must depend on additional, as yet unknown, physical factors.” She also points out that the polar.
Scientists find an explanation for the powerful gamma-ray bursts: binary stars. A new study suggests that being in a binary star system can cause a massive star to spin rapidly to produce such powerful explosions.
Bright rays of light called gamma-ray bursts can occur in binary star systems, as shown in this diagram. (Sincerely: University of Warwick / Mark Garlick) Throughout the universe, luminous bursts that astronomers call gamma-ray bursts explode in space.
These gamma-ray bursts are the brightest bursts: A typical gamma-ray burst can produce as much energy in its explosion or minutes as the sun produces over its lifetime. But despite its cruelty, scientists still don’t know what causes the gamma-ray burst.
Astronomers generally think that a type of gamma-ray burst, called a long-term gamma-ray burst, comes from very large, fast-moving stars. Now, a team of researchers has shown that stars like these in a binary system, orbiting with a companion star, possibly produce such explosions.
The researchers presented their findings in a recent article in the monthly notices of the Royal Astronomical Society. Just keep moving: Many solo stars who are starting to spin fast are unlikely to have to live toward the end of their lives, according to Ashley Crimes.
An astronomer at the University of Warwick and lead author of the new article. Massive stars explode a large amount of material over time, slowing down their spines, as ice skaters extend their arms mid-turn. The team’s article was published in the Astrophysical Journal.