Scientists 'see' dark matter web for first time
By observing how light is bent, a team of astronomers have created a visual map of how dark matter is distributed throughout the universe.
Van Waerbeke, Heymans, and CFHTLens collaboration
We canât see it, we canât feel it, we canât evenÂ interactÂ with itâŚ butÂ dark matterÂ may very well be one of the most fundamental physical components of our Universe. The sheer quantity of the stuff âÂ whateverÂ it is â is what physicists have suspected helps gives galaxies their mass, structure, and motion, and provides the âglueâ that connects clusters of galaxies together in vast networks of cosmic webs.
Now, for the first time, this dark matter web has been directly observed.
An international team of astronomers, led by Dr. Catherine Heymans of the University of Edinburgh, Scotland, and Associate Professor Ludovic Van Waerbeke of the University of British Columbia, Vancouver, Canada, used data from theÂ Canada-France-Hawaii TelescopeÂ Legacy Survey to map images of about 10 million galaxies and study how their light was bent by gravitational lensing caused by intervening dark matter.
The images were gathered over a period of five years using CFHTâs 1Ă1-degree-field, 340-megapixel MegaCam. The galaxies observed in the survey are up to 6 billion light-years awayâŚ meaning their observed light was emitted when the Universe was only a little over half its present age.
The amount of distortion of the galaxiesâ light provided the team with a visual map of a dark matter âwebâ spanning a billion light-years across.
âIt is fascinating to be able to âseeâ the dark matter using space-time distortion,â saidÂ Van Waerbeke.Â âIt gives us privileged access to this mysterious mass in the Universe which cannot be observed otherwise. Knowing how dark matter is distributed is the very first step towards understanding its nature and how it fits within our current knowledge of physics.â
This is one giant leap toward unraveling the mystery of this massive-yet-invisible substance that pervades the Universe.
âWe hope that by mapping more dark matter than has been studied before, we are a step closer to understanding this material and its relationship with the galaxies in our Universe,â Dr. Heymans said.
This post originally ran in Universe Today.
Jason MajorÂ is a graphic artist from Rhode Island now living and working in Dallas, Texas. He writes about astronomy and space exploration on his blogÂ Lights In The Dark, here on Universe Today and also on Discovery News.