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05 May, 2023
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A distant galaxy is alone because it devoured the other galaxies that once surrounded it, a new study suggests.
Galaxy 3C 297 floats in the void on its own, about 9.2 billion light-years from Earth, but it wasn't always that way. New observations by NASA's Chandra X-ray Observatory and the International Gemini Observatory have revealed that 3C 297 has all the characteristics of a galaxy cluster — except, importantly, the other galaxies. These missing galaxies apparently merged with each other and with 3C 297, the largest out of them with the most gravitational pull, until it was the only one left, researchers found.
"We expected to see at least a dozen galaxies about the size of the Milky Way, yet we see only one," study leader Valentina Missaglia, of the University of Torino in Italy, said in a statement.
3C 297 is now being referred to as a "fossil group" because it appears to be the final phase of a merger involving multiple galaxies that were once part of a cluster. It is also the most distant fossil group ever discovered.
Tags: science
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