Protogalaxy is a collection of ancient stars, and the rest of Milky Way grows from it.
The central area of the Milky Way, Sagittarius and ancient star clusters can be found above Canadian Telluride.
Astrophysicists who study the origins of the Milky Way may have discovered the "old heart" of our Milky Way - the original, ancient atomic nucleus , which all its stars and planets grow around it.
The collection of 8,000 oldest stars in our Milky Way are located in Sagittarius, and they come from the primitive people of the Milky Way—a primitive mass of gas and dust that formed the first stars of a young galaxy—has been around for more than 12.5 billion years. To discover the original clusters of stars, astronomers used data from the European Space Agency (ESA) Gaia Observatory, with the goal of drawing the most detailed and accurate map of the Milky Way.
"For a long time, it has been believed that (based on theory and simulation) the oldest stars are located in the right center of the Milky Way. We have now shown their large presence," the study's lead author Hans-Walterix , astronomer Max Planck at the Heidelberg Institute of Astronomy in Germany, told the journal Life Sciences . "It's like doing archaeology in the old town. We have shown that the oldest and most primitive ruins are located in the center of the 'modern' city."
The search for the ancient heart of our Milky Way begins in the most crowded area, with its center bulges, looking for a small portion of stars that are the same age as the Milky Way galaxy that is about 113 billion years old. In order to find a needle from a haystack like looking for a needle in a haystack, the researchers collected data on million stars collected by Gaia, which are located at 0 degrees in the center of the Milky Way, looking for stars with lower mass and long-lived stars with low metal content. Stars matching this outline were born in a much younger universe that had not been filled with heavy metals scattered everywhere in Supernova explosion .
But that's only half of the story, as the stars lacking metal in the Milky Way may also come from smaller dwarf galaxies , which are impacted throughout their lifespan and merged with our galaxies. By examining the paths of these stars in space while retaining only those that do not turn to areas where the Milky Way lacks metal, the researchers were able to separate the stars that make up the ancient heart from the stars originating in dwarf galaxies. This leaves researchers with some primitive stellar skeletons of the Milky Way growing—they estimate that this group has a mass of 150 million to 1.2 billion times that of our sun. The researchers say that because heavier stars die faster than smaller stars, the rest of the stars on average are about 11.5 times lighter than the sun. "These stars make up about half of the total mass of the stars after birth," said Rix . "So, so far, about half of the stars (from the protogalaxy) have survived."
The researchers' examination of the ancient heart that is now exposed in the Milky Way reveals two things. first , compared with young stars, because the stars of the old primitive galaxies rotate much less around the center of Milky Way , which confirms past observation that the core of the Milky Way began its still life, and eventually accelerated its rotation speed as the center of the Milky Way grows. followed by , despite multiple mergers with smaller galaxies, the tight clustering of stars at the center of the Milky Way shows that its core is not invaded by collisions from other galaxies.
"The Milky Way has never been shaken dramatically," said Rix . "Our Milky Way lives a protected life." With further research, researchers hope that the ancient heart will teach them more about the earliest years of our Milky Way, such as the type of supernova , which must have exploded when it was produced to produce the proportion of the early chemical element we see today.
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