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The Core of Massive Dying Galaxies Already Formed 1.5 Billion Years After the Big Bang

26 Jan 2020, 23:33 UTC
The Core of Massive Dying Galaxies Already Formed 1.5 Billion Years After the Big Bang
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The most distant dying galaxy discovered so far, more massive than our Milky Way -- with more than a trillion stars -- has revealed that the 'cores' of these systems had formed already 1.5 billion years after the Big Bang, about 1 billion years earlier than previous measurements revealed.The discovery will add to our knowledge on the formation of the Universe more generally, and may cause the computer models astronomers use, one of the most fundamental tools, to be revised. The result was obtained in close collaboration with Masayuki Tanaka and his colleagues at the National Observatory of Japan is now published in two works in the Astrophysical Journal Letters and the Astrophysical Journal.Galaxies are broadly categorized as dead or alive: dead galaxies are no longer forming stars, while alive galaxies are still bright with star formation activity. A 'quenching' galaxy is a galaxy in the process of dying -- meaning its star formation is significantly suppressed. Quenching galaxies are not as bright as fully alive galaxies, but they are not as dark as dead galaxies. Researchers use this spectrum of brightness as the first line of identification when observing galaxies in the Universe.A team of researchers of the Cosmic ...

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