Home > Astronomy, Galaxies, General Astronomy > Mapping The Universe In 3-D

Mapping The Universe In 3-D


Combining observations from Mauna Kea with data taken by telescopes in space, astronomers at the Institute for Astronomy (University of Hawaii at Manoa) and their collaborators have developed a technique that allows them to map collisions of giant galaxy clusters in three dimensions.

“Being unable to see these large-scale structures from different angles makes it very difficult to figure out their three-dimensional shapes, let alone their relative motions and interactions,” explains Harald Ebeling, IfA astronomer and an expert on galaxy clusters. “All we see in our images is a 2-D projection of a 3-D structure onto the plane of the sky.”

Luckily, when two galaxy clusters collide, astronomers can make use of a clever combination of observations to make the invisible visible. In three recent studies, Ebeling and an international team of collaborators created 3-D models of merging galaxy clusters. Creating these models requires mapping all the components of a cluster: the galaxies that we see in visible light, the hot gas permeating the cluster that emits X-rays, and the invisible dark matter that can be detected only because its gravity distorts the images of objects behind the cluster.

Full Story: http://www.ifa.hawaii.edu/info/press-releases/3-D_Universe/

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