Cosmic explosions even more powerful than first thought

Pablo Tucker
November 22, 2019

"It was finally realized here with very high significance for the first time, after many years of technical improvements and dedicated efforts", explained Teshima. Speaking to TOI, SB Pandey, an ARIES scientist who was part of the team along with his colleague Kuntal Misra, said that the star which is believed to have caused this explosion must have been at least 8 to 10 times the size of the sun.

Such an intensely powerful signal can only come from some of the most energetic events in the cosmos.

'What is remarkable about these particular bursts isn't how much energy they emit in total, but the energy that we see from the individual bits of light, ' explainsAndrew Levan, an astronomy professor at the University of Warwick and a co-author of one of the new papers 'We can think of light as made up of little particles called photons, and each of these photons carries an energy. The astrophysicist further added that his team was also in the process of searching for high energy gamma rays for 15 years but never succeeded.

"Scientists have been trying to observe very-high-energy emission from gamma-ray bursts for a long time", said Dr. Antonio de Ugarte Postigo, a scientist in the Instituto de Astrofísica de Andalucía.

Three studies published Wednesday in the journal Nature detail the findings from the two telescopes. The difference between these images reveals a faint, short-lived glow (centre of the green circle) located about 800 light-years from the galaxy's core.NASA, ESA, and V. Acciari et al. These can include the collapse of massive stars as supernovae or the merging of neutron stars or black holes.

"Gamma-ray bursts are the most powerful explosions known in the universe and typically release more energy in just a few seconds than our sun during its entire lifetime", gamma-ray scientist David Berge said in the release.

Now, scientists report they've detected 2 bursts more powerful than ever imagined. This is followed by the so-called afterglow, a less brighter but longer lasting emission over a broad range of wavelengths that fades with time. Mirzoyan stated these theories gave different explanations based on how electrons, magnetic fields, and ambient light interacted within the rubble from a gamma-ray burst explosion to generate gamma rays.

It could shed light on the physical processes that lead to such bright explosions and the creation of black holes where gravity is so strong not even light can escape.

The researchers found that this swear burst originated from a truly dense ambiance within the heart of a interesting galaxy at a distance that can maybe presumably grasp mild 5 billion years to streak back and forth.

In the late 1960s, secret spy satellites created to look for gamma-ray flashes from nuclear explosions began to detect mysterious bursts of gamma rays coming from outer space. Move with relativistic velocities, this shower produces a bluish light is detected, called Cherenkov light, which can be detected by, appropriately enough, Cherenkov telescopes.

MAGIC stands for the Major Atmospheric Gamma Imaging Cherenkov telescope and it has the capacity to detect high-energy gamma rays in the region of TeV.

"It's a trillion times more energetic than visible light".

The scientists expect that future research will continue to detect ultra-high-energy gamma-rays from gamma-ray bursts, now that astronomers know what to look for.

This first-ever detection comes after a decade-long search, and was a collaboration by The High-Energy Stereoscopic System ( H.E.S.S.), using the huge 28-m telescope of the H.E.S.S array in Namibia. The best candidate, they say, is inverse Compton scattering.

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