Scientists from Spain and Great Britain came to the conclusion that the “wind” of dark matter passes at the speed of 500 kilometers per second through the solar system. This flow is gravitationally associated with the stellar flow S1, which remains after the Milky Way has absorbed the dwarf galaxy. Article researchers published in the journal Physical Review D.
S1 is a group of 34 stars that pass through the vicinity of the solar system in the opposite direction to the rotation of the Milky Way. It was discovered last year when analyzing data from Sloan Digital Sky Survey (SDSS) for the mapping of the celestial sphere, as well as the Gaia space telescope.
The total mass of S1 is comparable to the mass of the dwarf galaxy in the constellation Pech, so scientists believe that the stellar flow should be associated with the halo of dark matter.
According to the ΛCDM model (Lambda-SidiEm, Lambda-Cold Dark Matter), in addition to the usual baryonic matter, which consists of stars and galaxies, there is dark matter, which makes up 22 percent of all matter in the universe. The conclusion about its existence was made on the basis of observing astronomical objects that behaved as if they were affected by the mass hidden from direct observation.
It is assumed that dark matter interacts with ordinary matter only through gravitational forces; therefore, it cannot be detected through the registration of electromagnetic radiation.
Researchers using a mathematical model determined how S1 affects the distribution of dark matter in the vicinity of the solar system. Based on this, they calculated how the stellar flow affects the probability of detecting wimps (WIMP) – the hypothetical particles that make up dark matter are. If wimps exist, they can be detected through registration by the detectors of light emitted when they are scattered by atomic nuclei.
However, scientists have come to the conclusion that vimpovyh detectors are unlikely to be able to capture these events. More sensitive are the detectors of axions – hypothetical particles that are another candidate for the role of dark matter.