One of the generally accepted cosmological models, given the slack

Centaurus A "hide" a very interesting secret. Astronomers have discovered that around this giant galaxy in the same plane with it are rotated several dwarf galaxies, the planets rotate around the star or stars that revolve around the galactic center. The interest of this discovery because it leads scientists to revise their attitude to the theory that the dwarf galaxies revolve around larger once in all directions, for example, like bees around a hive, that is more chaotic, not more systematically, as objects (planets and stars) as described above. About his work, the researchers have shared in the journal Science.

One of the generally accepted cosmological models, given the slack

Galaxy Centaurus A is located approximately 10 to 16 million light-years from the solar system and is located in the constellation Centaurus. It is very close, but still not part of the Local Group of galaxies, and is the closest active galaxy, which means that it is very bright and is a very powerful source of radio emission. In addition, it has an unusual form - a lenticular polar-ring galaxy. Now, Centaurus A has also become the first galaxy outside the Local Group, which scientists have discovered a dwarf galaxy, Satellites, rotating it in a plane.

The Milky Way and Andromeda, too, are dwarf galaxies, rotating them in the same plane, but the cosmological models based on the standard model Lambda-CDM, predict that most of the more compact galaxy revolve around the larger it is chaotic, moving in all directions, that turn makes the Milky Way and Andromeda exception rather than the rule. However, the new observation Centauri A refute this conclusion.

"Lambda-CDM model led astronomers to believe that the most we studied galaxy in the Universe - The Milky Way and Andromeda - stand out among all the others," - explains the researcher Helmut Dzherzhen of the Australian National University Research School of Astronomy and Astrophysics .

"But it looks like our own Milky Way and Andromeda are currently quite normal, and galaxies rotate in the same plane with other galaxies, in fact, quite common in the universe."

And yet the rotation of the satellite galaxies is slightly different from the rotation of the planets around their stars. The latter tend to wrap around the equator of their bodies. As for the satellite galaxies, such as those that revolve around Centaurus A, as, indeed, and around the Milky Way and Andromeda, then circling them around larger galaxies perpendicular to the equatorial plane, that is, around the poles of supermassive black holes located at their centers.

One of the generally accepted cosmological models, given the slack

Model dwarf galaxies rotation around galaxies Centaur A

Researchers say that detect galactic plane is quite simple for the Milky Way and Andromeda. While on Earth, you need to make snapshots of the sky every few years and make sure that at this moment where are the stars. Andromeda is from us about 2, 5 million light years, so it is perpendicular to the plane of rotation of the dwarf galaxies also find is not difficult. With Centaur plane A all appeared somewhat more complicated. However, the presence of a large amount of historical data collected about this galaxy, allowing the team of scientists to discover information about a minimum of 16 dwarf galaxies orbiting around it. A Doppler possible to determine the direction in which these are moving dwarf galaxies.

"We found that half of them have a redshift, indicating that they are moving away from us, while the other half has a blue shift, which suggests that they are, on the contrary, are moving in our direction," - explains astronomer Marcel Pawlowski University of California at Irvine (USA).

Based on this, researchers found that 14 of the 16 satellites galaxies have the same rotation plane. For example, the same of the Milky Way from the 11 satellite galaxies rotate only 8 with him in a perpendicular plane. Among 27 detected around galaxies Andromeda perpendicular to a plane of rotation 15 have.

Since the phenomenon under discussion today was observed for the third time, then, according to the researchers, the random factor can be safely discarded. In addition, it also implies that this phenomenon should occur much more frequently than previously thought - according to the standard models, this feature should be observed only at 0, 5 per cent of our neighboring galaxies. But we see that it is not.

"This means that we have missed anything," - said Pawlowski.

"Either simulation models have some shortcomings, either as our conventional model actually proved to be incorrect. The results of this research can be a starting point in the search for alternative models to explain our observation. "

The head of the study, Oliver Müller from the University of Basel (Switzerland) added that the findings also support the notion that a collision between two large galaxies (which happens quite often) can generate dwarf galaxies from discarded as a result of the matter collisions, attract tidal forces.