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Scientists find missing baryons - half the universe's missing matter
12 October 2017, 12:53 | Bernard Bryant
NEW SCIENTIST The particles link galaxies together and are part of the cosmic web
An global group of scientists the study have discovered the missing 50 percent of the visible matter in the Universe. Still, these simulations too predict that entire galaxies and planets in the universe are connected by long filaments of usual matter.
Both teams, looking at over a million pairs of galaxies, found evidence of gas filaments in the space between galaxies. Two teams of researchers have now claimed to have resolved this issue.
However, the result doesn't account for all the visible matter that should be there, and about 90 percent of it seems to be missing.
In the study, researchers found that in stars, the interstellar medium and the hot gas in galaxy clusters (clusters) is only 50 percent of the amount of baryonic matter, which before was called by the scientists.
In their studies, two teams of scientists used the cosmological Lambda-Cold Dark Matter model, which stipulates that dark matter and dark energy comprise more than 95 percent of the universe, while the remaining 4.6 percent include the ordinary (Baryonic) matter consisting of protons, neutrons and electrons. To study with a simulated structure, goes exactly in a way of the dark matter.
The particles were found by two teams - one led by experts at the University of Edinburgh, and one from the Institute of Space Astrophysics in Orsay, France. We exhibit that most of our discernment is because of unchained diffuse gas in filaments between dark matter halos and not restrained gas in dark matter halos.
Both teams took advantage of a phenomenon that occurs when light left over from the Big Bang passes through hot gas, known as the Sunyaev-Zel'dovich effect. As the light travels, some of it scatters off the electrons in the gas, leaving a dim patch in the cosmic microwave background - our snapshot of the remnants from the birth of the cosmos.
In 2015, the European Space Agency's Planck satellite mapped much of this effect throughout the observable universe.
'The missing baryon problem is solved'.
One group found filaments six times denser than the other, but further analysis suggests the discrepancy can be explained by the fact that some Planck renderings were recorded at varying distances. "Everybody sort of knows that [the missing matter] has to be there, but this is the first time that somebody-two different groups, no less-has come up with a definitive detection", he said.
Ralph Kraft, from the Harvard-Smithsonian Center for Astrophysics in MA, said the findings help align the discrepancy between observations and simulations of the universe.
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