Monday , January 25 2021

Solve a strange galaxy that made up 99.99 percent. dark matter, puzzle



Now, the formation of galaxies is difficult to understand without the ubiquitous but no less mysterious component called dark matter (TM). Astronomers have estimated how dark matter is for galaxies and found that they are 10 to 300 times more visible than matter.

However, with the discovery of the much-scattered Dragonfly 44 object a few years ago, this view has changed. Dark matter in this galaxy has been shown to be as much as 10,000 times larger than stars. Astonished by this discovery, astronomers set out to find out if this object was really anomalous or maybe something was wrong with the analysis of the excitations. Now we know the answer.

An international team led by the Captain Institute at the University of Groningen in the Netherlands, together with scientists from the Canaria Institute of Astrophysics (IAC) and the University of La Laguna (ULL), found that there are about 44 giants, so dark matter is much less than previous studies have shown. this proves that this galaxy is neither unique nor anomalous.

The results of the study were published in the journal Monthly Notices of the Royal Astronomical Society (MNRAS).

The Dragonfly 44 galaxy was discovered through in-depth study of the Coma cluster, which contains several thousand galaxies. This galaxy has been called unusual by researchers because it contains almost as much dark matter as birds do, equivalent to a billion masses of the Sun.

However, there are not hundreds of billions of stars in the DF44 galaxy as “Birds of Prey”, but only a hundred million, or a thousand times less. This means that TM is there ten thousand times more than the stars. If true, this galaxy would be the only object with a TM almost 100 times larger than expected from the number of stars.

However, after a thorough analysis of the balloon system in Dragonfly 44, the researchers found that there are only 20 ball clusters, and the total amount of TM exceeds the amount of normal, translucent material by about 300 times, which means that this indicator does not differ too much. of this type of galaxy. characteristic values.

“The fact that we found only 20 spheres in our work, instead of 80 as previously announced, dramatically reduces the amount of dark matter that should be in the galaxy. Also, if there are as many galaxies as we have discovered, the amount of dark matter in galaxy 44 Dragonfly is what would be expected of this type of galaxy. “The ratio of visible matter to darkness is not 1: 10,000, but only 1: 300,” said Ignacio Trujillo, an IAC researcher and co-author of the article.

“Dragonfly 44 has always been an anomaly that cannot be explained by existing patterns of galaxy formation. We now know that the previous results were wrong and the DF44 is not remarkable. “We can move on,” said Timor Saifolahi, a researcher at the Captain Institute and lead author of the article.

“Our work shows that this galaxy is not unique or unusual. “In this way, galaxy formation patterns can explain this without any modification,” said Michael A. Beasley, another IAC researcher, spherical group specialist and co-author of the article.

The total number of spheres is related to the total mass of the galaxy. Thus, by counting spheres, the amount of TM can be found, especially if the visible matter is only a small part of the total mass.

“But we still do not have a physical explanation for this relationship between the number of spheres and the total mass of the galaxy.” This is a purely empirical fact. This may be related to the initial amount of gas that forms stars and spheres. “The more dark matter in the galaxy, the more gas there is.” Knapen, IAC researcher and co-author of the article.




Source link