This is not about "Dark Matter".
Where is the Universe Hiding its Missing Mass?
The Universe's "missing mass" may have been found, according to a new study using Chandra data.
About a third of the "normal" matter (ie, hydrogen, helium, and other elements) created shortly after the Big Bang is not seen in the present-day Universe.
One idea is that this missing mass is today in filaments of warm and hot gas known as the WHIM.
Researchers suggest evidence for the WHIM is seen absorption features in X-rays collected from a quasar billions of light years away.
New results from NASA's Chandra X-ray Observatory may have helped solve the Universe's "missing mass" problem, as reported in our latest press release. Astronomers cannot account for about a third of the normal matter ” that is, hydrogen, helium, and other elements ” that were created in the first billion years or so after the Big Bang.
Detection of the Missing Baryons toward the Sightline of H1821+643
Based on constraints from Big Bang nucleosynthesis and the cosmic microwave background, the baryon content of the high-redshift Universe can be precisely determined. However, at low redshift, about one-third of the baryons remain unaccounted for, which poses the long-standing missing baryon problem. The missing baryons are believed to reside in large-scale filaments in the form of warm-hot intergalactic medium (WHIM). In this work, we employ a novel stacking approach to explore the hot phases of the WHIM.
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