First ‘image’ of a dark matter web that connects galaxies

Dark matter filaments bridge the space between galaxies in this false colour map. The locations of bright galaxies are shown by the white regions and the presence of a dark matter filament bridging the galaxies is shown in red. Credit: S. Epps & M. Hudson / University of Waterloo
Uncategorized
Share

From sciencedaily.com – April 17, 2017 –  SilentCircle – Uncategorized – Comments Off

Dark matter filaments bridge the space between galaxies in this false colour map. The locations of bright galaxies are shown by the white regions and the presence of a dark matter filament bridging the galaxies is shown in red. Credit: S. Epps & M. Hudson / University of Waterloo
Dark matter filaments bridge the space between galaxies in this false colour map. The locations of bright galaxies are shown by the white regions and the presence of a dark matter filament bridging the galaxies is shown in red.
Credit: S. Epps & M. Hudson / University of Waterloo

Researchers at the University of Waterloo have been able to capture the first composite image of a dark matter bridge that connects galaxies together. The scientists publish their work in a new paper in Monthly Notices of the Royal Astronomical Society.

The composite image, which combines a number of individual images, confirms predictions that galaxies across the universe are tied together through a cosmic web connected by dark matter that has until now remained unobservable.

Dark matter, a mysterious substance that comprises around 25 per cent of the universe, doesn’t shine, absorb or reflect light, which has traditionally made it largely undetectable, except through gravity.

“For decades, researchers have been predicting the existence of dark-matter filaments between galaxies that act like a web-like superstructure connecting galaxies together,” said Mike Hudson, a professor of astronomy at the University of Waterloo. “This image moves us beyond predictions to something we can see and measure.”

As part of their research, Hudson and co-author Seth Epps, a master’s student at the University of Waterloo at the time, used a technique called weak gravitational lensing, an effect that causes the images of distant galaxies to warp slightly under the influence of an unseen mass such as a planet, a black hole, or in this case, dark matter. The effect was measured in images from a multi-year sky survey at the Canada-France-Hawaii Telescope.

They combined lensing images from more than 23,000 galaxy pairs located 4.5 billion light-years away to create a composite image or map that shows the presence of dark matter between the two galaxies. Results show the dark matter filament bridge is strongest between systems less than 40 million light years apart.

“By using this technique, we’re not only able to see that these dark matter filaments in the universe exist, we’re able to see the extent to which these filaments connect galaxies together,” said Epps. [….]

Read more: https://www.sciencedaily.com/releases/2017/04/170412091230.htm


Uncategorized
Mysterious Megaliths Of Russia May Offer Evidence Of An Ancient Advanced Lost Civilization
Share

Some of these massive stone blocks can be natural formations, but there are also other huge structures that seem a bit too artificial to be considered a work of Mother Nature. Related PostsThis Is the Largest Stone Block Ever Carved By Human HandsWhen They Brought These Wolves Into The Park, …

Uncategorized
Declassified Files Reveal UK Feared Soviets, Chinese Would Acquire UFO Tech
Share

Once-classified documents being called “Britain’s X-Files” have revealed that the British Ministry of Defense spent half a century hunting UFOs, driven in some part out of concern that the Soviet Union or China had already gotten their hands on alien technology. Related PostsMinistry of Defence, Britain: MoD Discovers 18 New …

Uncategorized
Europe on suicide-Watch: Salafist Scare in Sweden as Report Points to Avalanche Growth of Radical Islam
Share

The number of Islamist extremists in Sweden has risen tenfold, the Swedish Defense College wrote in a new report on the Islamist threat commissioned by the Swedish Civil Contingencies Agency (MSB). The report was called “one of a kind” as it mapped out the jihadist environment in Sweden and its …