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Supercluster of galaxies near Milky Way found

An international team of astronomers has found one of the universe's biggest superclusters of galaxies near the Milky Way.

By: PTI | Melbourne |
December 25, 2016 3:29:57 pm
galaxies, supercluster of galaxies, galaxies supercluster, Milky Way, Vela supercluster, Vela supercluster of galaxies, space, science, science news An international team of astronomers has found one of the universe’s biggest superclusters of galaxies near the Milky Way. (Source: ANU)

An international team of astronomers has found one of the universe’s biggest superclusters of galaxies near the Milky Way. Researchers, including those from Australian National University (ANU), said the Vela supercluster, which had previously gone undetected as it was hidden by stars and dust in the Milky Way, was a huge mass that influenced the motion of our galaxy.

“This is one of the biggest concentrations of galaxies in the universe – possibly the biggest in the neighbourhood of our galaxy, but that will need to be confirmed by further study,” said Professor Matthew Colless from the ANU Research School of Astronomy and Astrophysics.

“The gravity of the Vela supercluster may explain the difference between the measured motion of the Milky Way through space and the motion predicted from the distribution of previously mapped galaxies,” said Colless. Colless used the Anglo-Australian Telescope to measure distances for many galaxies to confirm earlier predictions that Vela was a supercluster.

He also helped to estimate the supercluster’s effect on the motion of the Milky Way. The research involved astronomers based in South Africa, Australia and Europe. Two new Australian surveys starting in 2017 will confirm the size of the Vela supercluster.

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“The Taipan optical survey will measure galaxy distances over a bigger area around Vela, while the WALLABY radio survey will be able to peer through the densest parts of the Milky Way into the supercluster’s heart,” Colless said.

The research was published in the journal Monthly Notices of the Royal Astronomical Society.

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