In the centers of galaxies is dark matter halo, which explains the features of circular motion of stars around the nucleus.
An international team of astronomers under the leadership of Richard Massey (Richard Massey) from Durham University in England denied the “brightening” of dark matter, that is, the existence of non-gravitational interaction between clumps of invisible matter. Preprint of scientific work available in the repository arXiv.org, the article is accepted for publication in the journal Monthly Notices of the Royal Astronomical Society.
April 15, 2015, the same journal published an article “The behaviour of dark matter associated with bright galaxies cluster 4 located in the 10 kpc core of Abell 3827”. In it, the astronomers reported the discovery of evidence of non-gravitational interaction in the dark matter, which is in the galactic cluster Abell 3827 1.3 billion light years from Earth. The researchers studied the distribution of mass in the four colliding galaxies, using gravitational lens effect when an object bends the trajectory of light rays.
It is supposed that in the centers of galaxies is dark matter halo, which explains the features of circular motion of stars around the nucleus. Three clot of dark matter in Abell 3827 match the location of the three galaxies, however, the fourth bundle in its movement behind the nearby galaxy for five thousand light-years. This, according to scientists, point to the fact that dark matter act not only gravitational forces but also by some other interaction.
In the new study, astronomers used the complexes of radio telescopes Atacama Large Millimeter Array and the Very Large Telescope in Chile, which allowed us to conduct a more detailed spectroscopy of galaxies and to minimize distortion resulting from the effect of gravitational lensing. It turned out that the location of the halo in galaxies consistent with ΛCDM model, according to which dark matter interacts only via gravitational forces.
Dark matter, estimated to cosmologists, is 22 percent of the total mass of the Universe (74% is dark energy, and the rest of the accounts on visible matter). She does not interact with ordinary matter via electromagnetic and other fields, with the exception of gravity. The conclusion about its existence was made on the basis of the observation of astronomical objects that behave as if they are influenced by hidden from direct observation weight. At the moment, still have not discovered particles that could exist dark matter.