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The study says that the collision of dwarf galaxies could create regions devoid of dark matter in space

The study says that the collision of dwarf galaxies could create regions devoid of dark matter in space

In 2018, astronomers discovered a dwarf galaxy that does not appear to have any kind of gravity, i.e. It seems completely free of dark matter. Since then, a few dwarf galaxies with the same feature have been discovered – at least one of them, close to the first.

According to a new theory published by an international team of astronomers from United States of AmericaAnd the Canada And the GermanyThe origin of these different galaxies is due to the collision of two previous dwarf galaxies. According to them, the proximity of some of the results and the fact that they appeared to be far from each other served as the basis for the new study.

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The super-solid galaxy AGC 114905, which supposedly does not contain any dark matter, defies all known theories of the formation of galaxies in our universe (Photo: Mancera Piña et. al/ASTRON/Handout)

Practically speaking, the proposal states that the collision of two dwarf galaxies may have separated gases Within each of them, resulting in the formation of several smaller galaxies. Among those, some will be free of dark matter, since then The elusive element that makes up a lot of space It does not interact with ordinary matter (nor with itself).

In other words: because dark matter does not interact directly with anything, it could have easily escaped the field of “space debris” formed by the collision, and proceeded aimlessly through space. Meanwhile, at the point of collision, the constituent elements of the galaxies gave rise to smaller dwarf galaxies.

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The theory presents an interesting situation to explain a phenomenon about which we still know very little: dark matter is one of the most difficult elements to observe because it is, well, invisible – Doesn’t even react to lightIt can only be observed through the effect of its presence on visible objects close to it.

However, in 2018 and 2019, when we discovered two galaxies with no trace of dark matter (virtually, with no gravitational “pull” on their elements), it looked as if the science of this element hit a wall: we didn’t. That happens.

The study has been published with the new theory in the scientific journal temper nature.

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