Gamma-ray bursts (GRBs) are the brightest and most energetic light explosions in the universe. A single GRB emitted by a giant space explosion can shine about one million trillion times as bright as the Earth’s Sun. NASA — And in most cases scientists can’t explain why they happen.
Part of the problem is that all known GRBs come from very, very far — usually billions. Light year From the earth. Sometimes GRB’s home galaxy is so far away that the burst light appears to come out of nowhere, temporarily popping out of the black sky and disappearing after a few seconds. These “empty skies” Gamma rays As some astronomers call them, Burst has presented the ongoing cosmic mystery for over 60 years.But now a new study was published in the journal on September 15th. NatureProvides a compelling mathematical explanation for the origin of powerful bursts.
All of these ambiguous bursts of the sky are of large-scale stellar explosions in distant galactic disks, according to researchers who modeled interactions between gamma rays and other powerful energy sources such as cosmic rays. It may be the result.
“We modeled gamma-ray emissions from all galaxies in the universe … and found that it was the star-forming galaxies that produced most of them. [empty-sky] Gamma Ray Radiation, ”, Matt Ross, Principal Research Author, Astrophysicist, Australian National University, Canberra, Said in a statement..
Explosion from the past
Astronomers support two main explanations for the mystery of gamma rays in the sky.In one explanation, a ray of light is generated when a gas falls to a supermassive black hole. Black Hole It is located in the center of all galaxies in the universe. In this scenario, when a gas particle is sucked into a black hole, a small portion escapes and is instead emitted by a jet of large material near the speed of light. It is believed that these powerful jets may be the cause of gamma-ray bursts.
Another description refers to a stellar explosion called Supernova.. When large stars run out of fuel and erupt on these fierce supernovae, they can blow nearby particles at near the speed of light. These very energetic particles Cosmic raysCan collide with other particles scattered in the gaseous hinterland between the stars to produce gamma rays.
In their new study, researchers focused on that second explanation by modeling the interactions between cosmic rays and interstellar gases in different types of star-forming galaxies. They are affected by several important factors, such as the speed of gamma-ray emission, the size of the galaxy, the speed of star formation (which affects the speed of supernovae), and the initial energy of cosmic rays produced by each supernova. I found that.
Once the team had a model that predicted the percentage of GRB for all sizes of the galaxy, they compared it to a real-world study of gamma-ray emission edited by NASA’s Fermi Gamma-Ray Space Telescope. Researchers have found that their calculations are in line with observations and that supernovae in star-forming galaxies can explain most, if not all, GRBs in the sky.
“It is an important milestone to unravel the mysteries of the universe that astronomers have been trying to decipher since the 1960s and finally discover the origin of this gamma-ray emission,” Ross said.
Researchers added that black holes are probably the cause of some of the gamma rays picked up by our satellites. But when it comes to the mysterious empty sky GRB, a hungry hole isn’t just necessary. Exploding stars in the far corners of the universe are enough to explain this phenomenon.
Originally published in Live Science.
Scientists finally explained about the most energetic explosion in the universe
Source link Scientists finally explained about the most energetic explosion in the universe