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Dead galaxies may be packed with dark matter
Galaxies in a cluster roughly 300 million light years from Earth could contain 100 times more dark matter than visible matter, a new study has found. Researchers used powerful computer simulations to study galaxies that have fallen into the Coma Cluster, one of the largest structures in the universe in which thousands of galaxies are bound together by gravity.
Melbourne: Galaxies in a cluster roughly 300 million light years from Earth could contain 100 times more dark matter than visible matter, a new study has found. Researchers used powerful computer simulations to study galaxies that have fallen into the Coma Cluster, one of the largest structures in the universe in which thousands of galaxies are bound together by gravity.
Dark matter cannot be seen directly but the mysterious substance is thought to make up about 84 per cent of the matter in the universe. The study demonstrates for the first time that some galaxies that have fallen into the cluster could plausibly have as much as 100 times more dark matter than visible matter.
Yozin, who is based at The University of Western Australia, said that the galaxies he studied in the Coma Cluster are about the same size as our own Milky Way but contain only one per cent of the stars. He said that the galaxies appear to have stopped making new stars when they first fell into the cluster between seven and ten billion years ago and have been dead ever since, leading astrophysicists to label them "failed" galaxies. This end to star formation is known as "quenching".
