Astronomers aren't happy about the fact that some of the most powerful explosions in the Universe are happening in space.
It's frightening to experience agamma-ray burst. There are long ones that last for more than two seconds and short ones that last for less than two seconds. The amount of energy emitted is huge. They can be trillions of times brighter than the sun.
Long GRBs are caused by a star collapsing and forming a black hole that releases two powerful beams of energy. There are short ones caused when a pair of stars collide or a single star is destroyed. The merger causes an intense and powerful explosion if a black hole is left behind. The visible light flash has a thousand times the energy of a classic nova and is called a kilo nova. The rest of the energy is hit by high-energy rays. They are so bright we can see them in billions of light years from us.
We have been watching these bangs since the 1960s, but it wasn't until the 1990s that we were able to see their locations on the sky. I want you to find out more about this story.
After the launch of the Neil Gehrels Swift GRB- detecting satellite in 2004, trends were able to be seen and one became troubling, as many were able to have their host galaxy seen once the bright flash subsided. Deep observations didn't show any obvious host galaxies after they faded.
There are two possibilities for this. The universe is too small to be seen with the naked eye, and dwarf galaxies are invisible to telescopes from great distances. They may have been kicked out of their host. When massive stars explode, you need two massive stars in the same place to form a system of neutron stars. The system can be thrown away at speeds up to a million kilometers an hour if one or both of the supernova explosions is off center. They can shoot out a small one over millions of years.
Which one is it. To find out if they could solve the mystery, they looked at over a hundred sGRBs. They wanted to find those that were well located on the sky and didn't have a host galaxy. After narrowing the field down to 31 candidates, they used the 4.3-meterLowell Discovery Telescope to look for a host galaxy. They took the spectrum to find the distance. They turned to bigger and better telescopes, such as Hubble, if not. They used photometric redshifts to get their distance if they found a host star.
Out of the 31 sGRBs, 18 had very faint galaxies that ranged from 1.3 to 10 billion light-years away from us. There were 13 of them that did not have hosts. There is a possibility that there is still a galaxy. You can't tell which one is the host when you look around the sGRB position. It's possible that any of them could be the ones that got shot out.
The majority of these sGRBs were offset from the center of the universe. About 70% of them occur in the host's core. Long GRBs are more close to their host centers. It is1-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-6556 is1-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-6556
The mystery is still unresolved. It's not clear why some sGRBs don't seem to have hosts. The flash we see is due in part to material ejected at a decent fraction of lightspeed slamming into material around the stars. There isn't enough material between the universes to do this. Maybe these sGRBs have faint hosts and we can't see them? There is no way to know at the moment.
Some fainter hosts were found thanks to these observations. 80% of these blasts happen less than 8 billion light-years away from Earth, and more distant sGRBs tend to be farther out from their host galaxy core than nearby ones. I don't know why that one might be. There are more mystery.
We want to know how the elements strontium, Platinum and gold are created in the universe. It would be great to know how they form, how far from Earth they are, and where they are in the universe.
If they have one, that's assuming. Someday we will figure this out with bigger scope and more observations.
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