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Core of massive dying galaxies formed early after Big Bang by Staff Writers Copenhagen, Denmark (SPX) Jan 20, 2020
Astrophysics, Galaxies: 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.
What is a "dead" galaxy?
The farthest dying galaxy discovered so far reveals remarkable maturity "This result pairs up with the fact that, when these dying gigantic systems were still alive and forming stars, they might have not been that extreme compared with the average population of galaxies", adds Francesco Valentino, assistant professor at the Cosmic Dawn Center at the Niels Bohr Institute and author of an article on the past history of dead galaxies appeared in the Astrophysical Journal.
Why do galaxies die? - One of the biggest and still unanswered questions in astrophysics For instance, the Milky Way is still alive and slowly forming new stars, but not too far away (in astronomical terms), the central galaxy of the Virgo cluster - M87 - is dead and completely different. Why is that? "It might have to do with the presence of gigantic and active black hole at the center of galaxies like M87" Valentino says.
Earth based telescopes find extremes - but astronomers look for normality
The James Webb Telescope (JWST) represents hope for better data material in the near future The methods developed in close collaboration between the Japanese team and the team at the Niels Bohr Institute have already proven to be successful, given the recent result. "This is significant, because it will enable us to look for the most promising galaxies from the start, when JWST gives us access to much higher quality data" Francesco Valentino explains.
Combining observations with the tool - the computer models of the Universe The more galaxies we can study, the better we are able to understand the properties or situations leading to a certain state - if the galaxy is alive, quenching or dead. It is basically a question of writing the history of the Universe correctly, and in greater and greater detail. At the same time, we are tuning the computer models to take our observations into account, which will be a huge improvement, not just for our branch of work, but for astronomy in general" Francesco Valentino explains.
Research Report: "Stellar Velocity Disperson of a Massive Quenching Galaxy at z=4.01"
The 'cores' of massive galaxies had already formed 1.5 billion years after the big bang Tokyo, Japan (SPX) Dec 20, 2019 A distant galaxy more massive than our Milky Way - with more than a trillion stars - has revealed that the 'cores' of massive galaxies in the Universe had formed already 1.5 billion years after the Big Bang, about 1 billion years earlier than previous measurements revealed. "If we point a telescope to the sky and take a deep image, we can see so many galaxies out there," said Masayuki Tanaka, paper author and associate professor of astronomical science in the Graduate University for Advanced Studi ... read more
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