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Galaxy Secrets: Reveals the secrets of distant galaxies, we are not so special

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Our galaxy is the most studied sky Ganges in the universe (symbolic picture)


It is no surprise that our galaxy is the most studied sky Ganges in the universe because we live here, but only by studying a galaxy can only know about the complex processes by which galaxies are formed Or develop. Without the study of other distant galaxies one cannot quell the curiosity that our galaxy is a normal galaxy or it is unusual and unique. According to our research published in the astrophysical journal Latters, the first guess about our galaxy is correct. If we match the important details of the nature of our galaxy with the surrounding galaxies, then it shows that our house is not so special. At first sight, there is no reason to doubt that among the billions of galaxies in the studyable part of the universe, our galaxy is neither the largest nor the oldest nor the largest. It also looks like those other wavy galaxies of the universe, which is the most common type of galaxies.

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But when we talk about the structure of the galaxy and its chemical nature, it starts to look different. When we look at the ends (where it is not possible to form spiral arms) of these spiral galaxies, it looks like an elongated round shape with peach-like shapes in the middle of it. Astronomers have known it for at least a century. However, that simple picture changed in 1983, when researchers using Australian telescopes discovered an ancient “thick disk” -like component in the galaxy. This structure is blurred compared to the round figure discovered in earlier studies that can be called a thin disc, and it is not possible to see this thick disk with the naked eye, whereas the previously discovered figure is a streak of stars in the sky on a clear night. As is clearly visible.

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The thin disk, where our Sun resides, is about one thousand light-years thick and about one million light-years in diameter, and passes through the thick disk, in the same plane. The thick disk is a few thousand light-years thick, but less dense in terms of the number of stars. A recent interesting discovery shows that thick and thin discs have very different types of stars. Stars that are in thin discs have a high proportion of heavy elements such as iron (“metal”, in astronomy) and a relatively small amount of “alpha element” (carbon, oxygen, magnesium, silicon, and a few others). While the stars in the thick discs contain about 100 times less metal, the alpha elements are higher.

This double-disk structure, with its typical population of stars, is very difficult to replicate in computer analysis because for a long time, computer models with similar structures could only be built in a specific scenario. In such a situation, we studied some galaxies that look like our Milky Way through a very large telescope at the European Southern Observatory in Chile.

In the meantime, after studying and comparing the thin and thick layers of a particular galaxy UGC 10738, which is about 32 million light years away, we came to know that the chemical composition of the stars of UGC 10738 is the chemical composition of the stars of our galaxy. The structure is the same. The stars found in the thick and thin layer found metal-rich and magnesium-deficient stars centered in a thin disk along the center of the galaxy, while a distinct cluster of low-metal and magnesium-filled stars above and below the thick disk region. found in. It simply means that the distant galaxy is remarkably similar to ours and there is probably nothing remarkable about our galaxy.

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This finding suggests that disk-related features in the galaxy may be part of the standard process of their formation. The second fact is that our galaxy is similar to other galaxies, so other unseen mysteries of the entire universe can be solved by its study.

(Apart from the headline, this news has not been edited by the NDTV team, it has been published directly from the Syndicate feed.)


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