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By TechThop Team
Posted on: 08 Aug, 2022
Aspects of dark matter are mysterious and invisible, and astronomers believe it permeates the universe. Most galaxies are surrounded by halos of this substance.
A galaxy and others in its neighborhood are both gravitationally influenced by the mass of the halo. As far as dark matter and galaxies are concerned, that's pretty much the standard view.
According to the 'Standard Model' of cosmology, galaxies are protected from neighbor galaxies' gravitational influence by dark matter shells or halos.
Researchers at the University of Bonn and Saint Andrews in Scotland discovered something strange when they examined the Fornax Cluster, which lies 62 million light-years from Earth.
Numerous dwarf galaxies in this region have distorted perturbed shapes. I find this strange, especially if dark matter halos should surround them.
The dwarf galaxies are the smallest in the universe. A galaxy cluster or much larger companion usually contains these small and faint stars. There are several dwarf galaxies surrounding the Milky Way Galaxy.
The Sagittarius Dwarf Spheroidal is being cannibalized by it. An ancient dwarf galaxy near ours, Tucana II, has an astoundingly massive dark matter halo, according to recent studies.
Fornax perturbed dwarf observations were analyzed by Kroupa and Ph.D. student Elena Ascencio. Their goal was to determine the extent and causes of gravitational distortions in these galaxies.
There are a few factors that determine the level of distortion to expect. The dwarf galaxy has several internal characteristics. Additionally, their distance from the cluster's center is important. There are much stronger gravitational influences there.
Large galaxies with few stars are easily disturbed by strong gravitational tides because of their large size. Galaxies within a cluster's core face the same problem.
If dwarf galaxies in Fornax are surrounded by dark matter, their perturbed, disturbed shapes are hard to explain. It is unlikely that they will be misshapen if they do have halos.
However, they appear in a disturbed manner. Hence, it is clear that these galaxies do not have dark matter halos encircling them.
The Standard Model needs some tweaking if what the astronomers found is confirmed. In addition, the strange galaxy shapes can be explained in at least one alternative way. There is a model called Mond.
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