An X-ray survey by the orbiting eROSITA instrument helps cosmologists determine the clumpiness (or distribution) of matter in the Universe.
Clusters of galaxies as observed by the eROSITA instrument. The idea is to determine the clumpiness of matter in the Universe. Colors indicate the redshift of the clusters, up to about 9 billion years of lookback time. Credit: MPE, J. Sanders for the eROSITA consortium.
The eROSITA X-ray instrument orbiting beyond Earth performed an extensive sky survey of galaxy clusters to measure matter distribution in the Universe. Scientists at the Max Planck Institute for Extraterrestrial Physics recently shared their analysis of its cosmologically important data. eROSITA’s observations of galaxy clusters and distribution of matter showed several interesting results. First, both dark matter and visible matter , make up about 29 percent of the total energy density of the Universe. Presumably, the rest consists of dark energy, which we don’t know much about, yet. Energy density is the amount of energy stored in a region of space as a function of volume. In cosmology, it also includes any mass in that volume of space.“tension”.
A computer simulation of what gas and stars in a galaxy cluster look like, and how they look embedded in the cosmic web. The assembly of galaxy clusters has implications for the clumpiness of the Universe throughout time. Credit: Yannick Bahé.
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