Use the MUSE instrument on the VLT at the European Southern Observatory in Chile, as well as images from the Hubble Space Telescope, a team of astronomers examined the simultaneous collision of four galaxies in the cluster Abell 3827 about 1.3 billion light years from Earth. The researchers were able to determine the location of the mass in the system and compare the distribution of dark matter with the positions of bright galaxies.
The name of the dark matter concerns the matter of the universe, which we can not see. Researchers can apply for the position based on the analysis of the effects of gravity, inter alia, through a technique called gravitational lensing. Galaxy collision occurred in the space provided at the line before a much more distant, unrelated to the source of light. Mass of dark matter around galaxies colliding significantly disturbed spacetime, curving the light beam, coming to us from the distant background galaxies and distorting the image of the characteristic shapes of curves.
current theories predict that all the galaxies are inside clumps of dark matter. Without derived from the force of gravity might fall apart due to the rotation. It is believed that the universe just 5 percent of the total mass and energy is a “normal” matter, 27 percent is dark matter, and the remaining 68 percent is dark energy.
In their study, the researchers observed the four colliding galaxies and found that one of the centers of dark matter seems to be about 5000 years for the galaxy light that should surround. This result indicates that dark matter interacts with each other in a different way than just by gravity. Perhaps we are there to deal with some peculiar “friction”.
“We used to think that dark matter lurking around and beyond the influence of gravity leads not to anyone. If, however, as a result of such a collision could occur downside, it suggests that the nature of the interaction is much more interesting and the physics of this “hidden” universe around us, much richer, “- said the head of the research group, Richard Massey of Durham University.
belonging to the team Liliya Williams of the University of Minnesota, said: “Based on the analysis of gravitational interactions that shape the universe we know that dark matter exists, however, still embarrassingly little is known about what really is. Our observations suggest that dark matter may be affected by the forces other than gravity. This means that at least a few theories We can give up about it. ”
It seems that if the dark matter interacts with the outside world only by gravity, “it notes,” can not be the quite dark.
Grzegorz Jasinski
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