Astronomers discover largest-ever dark matter structures spanning 270M light-years

Feb 21, 2008

A University of British Columbia astronomer with an international team has discovered the largest structures of dark matter ever seen. Measuring 270 million light-years across, these dark matter structures criss-cross the night sky, each spanning an area that is eight times larger than the full moon.

“The results are a major leap forward since the presence of a cosmic dark matter web that extends over such large distances has never been observed before,” says Ludovic Van Waerbeke, an assistant professor in the Dept. of Physics and Astronomy.

To glimpse the unseen structures, the team of French and Canadian scientists “X-rayed” the dark matter, an invisible web that makes up more than 80 per cent of the mass of the universe.

The team used a recently developed technique called “weak gravitational lensing,” which is similar to taking an X-ray of the body to reveal the underlying skeleton. The study relied on data gathered from the world’s largest digital camera.

“This new knowledge is crucial for us to understand the history and evolution of the cosmos,” says Van Waerbeke. “Such a tool will also enable us to glimpse a little more of the nature of dark matter.”

The astronomers observed how light from distant galaxies is bent and distorted by webs of dark matter as it travels toward Earth. They then mapped dark matter structures by measuring the distortions seen in these galaxy light patterns.

The study involved 19 researchers from 11 institutions and was led by UBC, the Institut d'Astrophysique de Paris, the Universite Pierre and Marie Curie (UPMC) and the University of Victoria. Van Waerbeke and his co-authors will publish their findings in a forthcoming issue of the journal Astronomy and Astrophysics. The submission can be seen at: arxiv.org/abs/0712.0884 .

The team spent several years developing the gravitational lensing tool, which is one of the major goals of the Canada-France-Hawaii-Telescope (CFHT) Legacy Survey.

The gravitational lensing technique also played a pivotal role in another recent study: Astronomers produce first detailed map of dark matter in a supercluster -- phys.org/news119182387.html

Source: University of British Columbia

Explore further: Hubble's ultraviolet telescope has revealed more about the stars than we could ever see

Related Stories

Enormous hole in the universe may not be the only one

Apr 22, 2015

Astronomers have found evidence of a giant void that could be the largest known structure in the universe. The "supervoid" solves a controversial cosmic puzzle: it explains the origin of a large and anomalou ...

CERN researchers confirm existence of the Force

Apr 01, 2015

Researchers at the Large Hadron Collider just recently started testing the accelerator for running at the higher energy of 13 TeV, and already they have found new insights into the fundamental structure ...

Galaxy clusters collide—dark matter still a mystery

Mar 26, 2015

When galaxy clusters collide, their dark matters pass through each other, with very little interaction. Deepening the mystery, a study by scientists at EPFL and the University of Edinburgh challenges the ...

Recommended for you

The riddle of galactic thin–thick disk solved

Apr 24, 2015

A long-standing puzzle regarding the nature of disk galaxies has finally been solved by a team of astronomers led by Ivan Minchev from the Leibniz Institute for Astrophysics Potsdam (AIP), using state-of-the-art ...

Giant cosmic tsunami wakes up comatose galaxies

Apr 24, 2015

Galaxies are often found in clusters, with many 'red and dead' neighbours that stopped forming stars in the distant past. Now an international team of astronomers, led by Andra Stroe of Leiden Observatory ...

Astronomers find runaway galaxies

Apr 23, 2015

We know of about two dozen runaway stars, and have even found one runaway star cluster escaping its galaxy forever. Now, astronomers have spotted 11 runaway galaxies that have been flung out of their homes ...

User comments : 3

Adjust slider to filter visible comments by rank

Display comments: newest first

RAL
not rated yet Feb 22, 2008
Oh yes Physorg! Give us more like this. And with the links to reglated stories. Excellent job.

Here's a reference I found that does a good job of going through lensing basics with nice graphics included:
http://www.cita.u...ing.html

And if you go to the arxiv.org link noted in the article you can click on the pdf link in the right column and get the whole article. Nice!
vlam67
1 / 5 (1) Feb 22, 2008
.. A University of British Columbia astronomer with an international team has discovered the largest structures of dark matter ever seen.


I expect a science site like physorg to be more precise in the wording. Dark matter can be detected and illustrated by various means, but not "seen" in the strict human optical sense.
mike352
not rated yet Feb 23, 2008
Notice that Physorg writes very very few articles on this site. This site is just a compilation of articles written by universities, the AP, and other organizations. Look at the bottom of this article. This one comes from the University of British Columbia, for example.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.