Image Credit: Marcel Drechsler/Shutterstock

Astronomers believe that galaxies cannot function without the gravitational pull of dark matter. So a route of galaxies unrestricted by this unusual material, with no apparent cause, would be an extraordinary discovery. In a paper circulated in Nature on 18 May 1, astronomers say they might have identified such a system like a strand of 11 galaxies that don’t include any dark matter, which could have been established in the same historical collision. But several of their peers are skeptical that the claim is much more than an assumption.

This kind of system could be utilized to understand how galaxies form and the Nature of dark matter itself. “If proven right, this could certainly be exciting for galaxy formation.

However, the jury is still out,” tells Chervin Laporte, an astronomer at the University of Barcelona in Spain.
In the recent paper, van Dokkum’s team not only relates the two different galaxies but says their properties are compatible with them being shaped in a high-speed concussion eight billion years ago, which also generated more such structures. “This single explanation explains so many odd things about these galaxies,” announces van Dokkum.

The team obtained its scenario from simulations initially established to illustrate unique details in larger-scale collisions between galaxy clusters.
The researchers stared at such galaxies in the line between DF2 and DF4. They observed between three and seven new contenders for dark matter-free galaxies and weird, faint galaxies at either end, which could be the dark matter and stars persisting from the progenitor galaxies. “It was staring you in the face once you knew what to look for,” explains van Dokkum.


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