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ANDIn a statement, the IA said the study, published in the scientific journal ‘Astronomy & Astrophysics’, took “several years and a lot of computing power.”
The team of researchers, who analyzed about “half a million spectral from a sample with all kinds of spiral galaxies (such as the Milky Way), “he was able to measure,” for the first time “, the variation in the age of the stars and understand how this variation is related to other properties of the galaxy, like the existence of nuclei goods or the total mass of stars.
According to the institute, the measurement, made from the center to the periphery of the galactic nucleus, led to the conclusion that the stars in the center of the “more massive” spiral galaxies are older than the stars located in the periphery of the nucleus. [conhecido por bojo] and that the opposite occurs in less massive spiral galaxies, that is, the youngest stars are in the center of the nucleus and the oldest stars in the periphery.
“This result seems to be in accordance with a previous study carried out by the team, which had already found strong evidence of a unified scenario for the formation of spiral galaxies,” clarifies the IA, adding that in opposition to the “more accepted theory “Small and large spiral galaxies” seem to form the same way. “
According to the IA, the data obtained from the study can also be used to determine “the impact that the nuclei of galaxies goods have in the evolution of the lump [conjunto de estrelas encontrado no núcleo da maioria das galáxias espirais] and, consequently, in the galaxy itself. ”
“Understanding how the nucleus of galaxies forms and evolves is essential to understand the formation of black holes”supermassive‘ [regiões do Universo de grande massa de onde nem a luz escapa] during season of Reionization [segunda grande transição de fase do Universo] and how it influenced the evolution of galaxies, “he says.
Quoted in the document, Iris Breda, the first author of the article, says that there are several “important lessons to be learned from the study,” but the “most relevant” is that the nuclei of the most massive galaxies “cannot have formed in a single star formation outbreak, as is often the case. to accept “.
“On the contrary, these results point to a scenario in which the stellar nuclei gradually formed, over two or four billion years,” says Iris. BedraPhD in the Faculty of Sciences of the University of Porto (FCUP)
The researcher also claims that the study “supports the hypothesis that less massive galaxies, which are currently actively forming stars at its center, it seems actually with smaller-scale versions of the most massive galaxies in their early stages of evolution. “
Also mentioned in the document, José Afonso, coordinator of the AI, points out that the “fine details” of the formation and evolution of galaxies are, due to the combination of observations with models and computational tools, “finally exposed”.
“These techniques will soon be taken to a new level, when we install the powerful spectrograph MOONS in the very large telescope IT’S ONLY. We will have access to detailed observations of millions of galaxies from the early evolution of galaxies, when the Universe was less than half the age. stream“concluded.
The study of nuclei. goods of galaxies, from the era of reionization, and its impact on the evolution of galaxies is one of the main research axes of the Institute of Astrophysics and Space Sciences (IA).
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