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July 9, 2012 at 7:52 pmFiled Under:Ann Arbor, Dark Matter, Dark Matter Filaments, University of Michigan
Canada Goose Parka A filament of dark matter has been directly detected between the galaxy clusters Abell 222 and Abell 223. The blue shading and yellow contour canada goose outlet in usa lines represent the density of matter. Image credit: Jrg Dietrich, UM Department of Physics Canada Goose Parka
ANN ARBOR Scientists have, for the first time, directly detected part of the canada goose outlet online reviews invisible dark matter skeleton of the universe, where more than half of all matter is believed to reside.
The discovery, led by a University of Michigan physics researcher, confirms a key prediction in the prevailing theory of how the universe’s current web like structure evolved.
buy canada goose jacket The canada goose outlet map of the known universe shows that most galaxies are organized into clusters, but some galaxies are situated along filaments that connect the clusters. Cosmologists have theorized that dark matter undergirds those filaments, which serve as highways of sorts, guiding galaxies toward the gravitational pull of the massive clusters. Dark matter’s contribution had been predicted with computer simulations, and its shape had been roughed out based on the distribution of the galaxies. But no one had directly detected it until now. buy canada goose jacket
canada goose coats “We found the dark http://www.canadagoosesalesus.com matter filaments. For the first time, we can see them,” said Jrg Dietrich, a physics research fellow in the University of Michigan College of Literature, Science and the Arts. canada goose coats
canada goose store Dark matter, whose composition is still a mystery, doesn’t emit or absorb light, so astronomers can’t see it directly with telescopes. They deduce that it exists based on how its gravity affects visible matter. Scientists estimate that dark matter makes up more than 80 percent of the universe. To “see” the dark matter component of the filament that connects the clusters Abell 222 and 223, Dietrich and his colleagues took advantage of a phenomenon called gravitational lensing. canada goose store
Canada Goose Outlet The gravity of massive objects such as galaxy clusters acts as a lens to bend and distort the light from more distant objects as it passes. Dietrich’s team observed tens of thousands of galaxies beyond the supercluster. They were able to determine the extent to which the supercluster distorted galaxies, and with that information, they could plot the gravitational field and the mass of the Abell 222 and 223 clusters. Seeing this for the first time was “exhilarating,” Dietrich said. Canada Goose Outlet
cheap Canada Goose “It looks like there’s a bridge that shows that there is additional mass beyond what the clusters contain,” he said. “The clusters alone cannot explain this additional mass.” cheap Canada Goose
buy canada goose jacket cheap Scientists before Dietrich assumed that the gravitational lensing signal would not be strong enough to give canada goose outlet ontario away dark matter’s configuration. But Dietrich and his colleagues focused canada goose outlet in vancouver on a peculiar cluster system whose axis is oriented toward Earth, so that the lensing effects canada goose outlet uk sale could be magnified. buy canada goose jacket cheap
canada goose clearance sale “This result is a verification that for many years was thought to be impossible,” Dietrich said. canada goose clearance sale
The team also found a spike in X ray emissions along the filament, due to an excess of hot, ionized ordinary matter being pulled by gravity toward canada goose outlet hong kong the massive filament, but they estimate that 90 percent or more of the filament’s mass is dark matter.
canada goose deals The researchers used data obtained with the Subaru telescope, operated by the National Astronomical Observatory of Japan. They also used the XMM Newton satellite for X ray canada goose jacket outlet observations canada goose deals.