A giant Galaxy cluster can help us understand dark matter

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In this detailed image is Abell 3827, a group of galaxies that offers plenty of exciting opportunities to study.  Hubble discovered it to study dark matter, one of the biggest puzzles for cosmologists today.
In this detailed image is Abell 3827, a group of galaxies that offers plenty of exciting opportunities to study. Hubble discovered it to study dark matter, one of the biggest puzzles for cosmologists today. ESA / Hubble & NASA, R.Massey

Dark matter is one of the greatest mysteries of physics. From the findings of cosmologists, we know that everything we see around us — every proton, electron, and neutron — comprises only a small fraction of all matter in the universe. So what is all this other thing? According to the theory of physicists, it must be a kind of particle that we cannot currently directly detect, although we can see its effects. They call this hypothetical particle dark matter.

Exploring very large galaxies helps to understand dark matter, because we know that the dark clusters of matter around galaxies form a halo. The gravitational effects of these massive halos are more evident when the galaxy in question is large. So recently, the Hubble Space Telescope took this picture of the huge galaxy cluster Abell 3827, which creates a strong gravitational lenses effect.

This group of galaxies discussed the nature of dark matter. In 2015Some scientists believed they found dark matter interacting with other dark matter in this region when they saw a cloud of dark matter behind the surrounding galaxy. This means that there would be a kind of dark matter particle that differs from the normal view of dark matter.

However, this idea was eventually rejected when the same team of researchers made further observations in 2017, adding data from the Atacama Large Millimeter / submillimeter Array as well as the Very Large Telescope’s MUSE to improve its cluster model.

This new set of observations “reveals an unusually strong gravitational lens configuration at the core of a cluster with at least seven lens images of a single background helix, wrote. “The new spectroscopic data allows for better reduction of foreground light and better identification of multiple background images. The inferred distribution of dark matter is consistent with concentrated galaxies, as expected [the Lambda cold dark matter model]. “

This means that the new data showed that dark matter behaves as expected in the traditional view and does not support the idea of ​​self-interacting dark matter. Researchers continue to study dark matter, for example the future European Space Agency Euclid telescope trying to understand more about this mysterious phenomenon.

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