Dark galaxies are called low surface brightness galaxies. It is because of them that we have obtained important confirmation and new information about dark matter, which is one of the biggest mysteries in the universe.
Stellar physicists Keira Di Paul, Paul salucci and Alcott Adnan of the International Institute of advanced research (sissa) jointly published a new study in the monthly journal of the Royal Astronomical Society: discoid galaxies can be represented by cosmic relations. In this study, we analyzed the so-called dark galaxies, which are a special type of galaxies.
The researchers analyzed the rotational speeds of the stars and gases that made up the subject and pointed out that galaxies with low surface brightness behaved very consistently.
The results consolidate several clues about the existence and behavior of dark matter, and open up a new scene for its interaction with bright matter. Dark matter exists, but you just can’t see it.
Dark matter seems to account for 85% of the mass of the universe. The effect of dark matter on other objects in the universe can be detected, but cannot be observed directly because it does not emit light.
One of the research methods is the galaxy rotation curve, which is a system to describe the velocity trend of stars according to the distance from the star to the center of the galaxy.
The observed changes are related to the gravitational interaction caused by the existence of stars and the dark components of matter.
Therefore, according to the influence of dark matter on the observed matter, rotation curve is a good way to obtain dark matter information. In particular, the analysis of rotation curve can be carried out separately, or a group of galaxies with similar characteristics can be analyzed according to the universal rotation curve (URC) method.
The novelty of this study is that it is the first time to apply the cosmic rotation curve method which has been applied to other types of galaxies to large samples, such as dark galaxies, and obtain similar results. Comparing the rotation curves of different dark galaxies, we find that they have no discontinuity, but gradually change in order from small to large.
Similar changes have been observed in spiral galaxies. So far, it has shown that all disk galaxies, spiral galaxies, dwarf galaxies and now dark galaxies can be represented by cosmic relations, which means that an orderly trend can be expressed by a formula, which was first applied in 1996.
As is often the case in scientific research, this study reveals more surprising and unexpected results. Scaling relationships between disk and dark matter halo properties have been found, such as the relationship between disk size and the size of the inner region of constant dark matter halo density.
In addition, by comparing the relationships found in dark galaxies with those obtained in different types of galaxies, it is found that they are almost identical. In addition, this is a very surprising discovery, which confirms that galaxies with very different shapes and histories show the same relationship between the properties of dark matter and luminescent matter.
This result, together with some special features of dark galaxies, opens up a series of new scenarios, including another direct interaction besides the gravitational interaction between the two kinds of matter that form galaxies. An interesting idea will be confirmed by new observations.