Science & Technology - Posted by Nicole Casal Moore-Michigan on Tuesday, July 10, 2012 14:48 - 0 Comments
Team detects clusters’ dark matter scaffold
U. MICHIGAN (US) — For the first time, scientists have directly detected part of the 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.
Straight from the Source
The 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.
“We found the dark matter filaments. For the first time, we can see them,” says Jörg Dietrich, a physics research fellow. Dietrich is first author of a paper on the findings published online in Nature and to appear in the July 12 print edition.
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.
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 says.
“It looks like there’s a bridge that shows that there is additional mass beyond what the clusters contain,” he says. “The clusters alone cannot explain this additional mass,” he says.
Scientists before Dietrich assumed that the gravitational lensing signal would not be strong enough to give away dark matter’s configuration. But Dietrich and his colleagues focused on a peculiar cluster system whose axis is oriented toward Earth, so that the lensing effects could be magnified.
“This result is a verification that for many years was thought to be impossible,” Dietrich says.
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 the massive filament, but they estimate that 90 percent or more of the filament’s mass is dark matter.
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 observations.
Other contributors from the Kavli Institute for Particle Astrophysics and Cosmology at Stanford University, Ohio University, Max Planck Institut für extraterrestrische Physik in Germany, University of Edinburgh, and University of Oxford contributed to the findings, which were funded by the National Science Foundation and NASA.
More news from University of Michigan: http://www.ns.umich.edu/new/