Published: Thu, October 12, 2017
Science | By Eileen Rhodes

Researchers Found Out Where the Visible Matter in the Universe Is Hiding

Researchers Found Out Where the Visible Matter in the Universe Is Hiding

But other entities from the universe also pointed that there must be the ordinary matter than previously observed. Baryonic matter - part of what we contemplate "normal matter" in the universe -constitutes everything we are accustomed with, the stars, planets, the chair you are sitting on, the device you are using to read this, and you.

Now, they finally managed to find out what was going on with it, and discovered it was merely hiding. But scientist felt that importance of detecting these missing matter or filament to know about the formation of the Universe and what keeps the galaxies intact.

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 solve this challenge, both teams incorporated the Sunyaev-Zel'dovich effect, which occurs when enduring light from the Big Bang travels through hot gas. Anna de Graaff, a researcher at the University of Edinburgh, led the other team.

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The scientists analyzed data obtained by the orbiting observatory Planck, created to study the cosmic microwave background (CMB), which remained after the Universe became transparent to thermal radiation.

Because the gas filaments between galaxies are so tenuous, the dim patches they produce don't show on Planck's map directly. This mismatch is known as the "missing baryon problem". Tanimura's group found they were nearly three times denser than the mean for normal matter in the universe, and de Graaf's group found they were six times denser - confirmation that the gas in these areas is dense enough to form filaments. And scientists have successfully identified missing baryons among extremely hot gas filaments. "We expect some differences [between the density] because we are looking at filaments at different distances". He said that half of baryons (missing baryons) are deemed to thrive in filament structures between dark matter halos as dispersed gas, WHIM (warm hot intergalactic medium).

Tanimura's paper has been submitted for publication in the Monthly Notices for the Royal Astronomical Society, while de Graaff's has been submitted to the Nature journal. "This goes a long way toward showing that many of our ideas of how galaxies form and how structures form over the history of the universe are pretty much correct", said Ralph Kraft, a professor at Harvard-Smithsonian Center for Astrophysics in MA.

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