printed 09/22/2022 16:57 / up to date 09/22/2022 16:58
In the middle of the cluster of two million stars at the middle of the Milky Way is the origin of the galaxy. The protogalaxy, thought of the “previous and poor” coronary heart of the star cluster, is shut to the constellation Sagittarius, seen to the left. – (credit score: TERENCE DICKINSON/ESA)
At the middle of the Milky Way is an “previous coronary heart” that gave birth to a big cluster of stars, and after 12.5 billion years it’s nonetheless “beating” and alive. This discovery was made by scientists from the Max Planck Institute for Astronomy, who discovered a protogalaxy that gave rise to an enormous highly effective spiral that hosts the Earth, the Solar System and hundreds of different methods.
Physicists clarify: A galaxy the dimension of the Milky Way didn’t seem by itself. It turns into a high-magnitude movement mixed with different smaller galaxies—or, in astronomers’ phrases, a cannibalistic movement with a number of star clusters.
However, it takes a galaxy to begin transferring, and till then, this main star cluster has eluded astronomers. In a examine printed by German scientists at the Max Planck Institute for Astronomy on September 7, the crew brings excellent news to the world of astronomy: The coronary heart of the Milky Way has been discovered — it’s previous and “poor” in metals.
Using information from the Gaia telescope, astronomers analyzed almost 2 million stars in the area of the Galactic Center, close to the constellation Sagittarius, and recognized 18,000 historical stars of the similar age as the predicted origin. The Milky Way is 12.5 billion years previous.
“People have lengthy assumed that such a big inhabitants (of historical stars) needs to be at the middle of our Milky Way, and Gaia now reveals that they do,” says astronomer Hans-Walter Ricks of the Max Planck Institute for Astronomy. Heidelberg, Germany.
To decide whether or not protogalaxies had been the origin of galaxies, scientists analyzed them in depth. The first step was to assess whether or not they had been certainly historical stars—a sequence of stellar objects thought of to be low-mass, very metal-poor and composed principally of hydrogen and helium. The reply was sure: 18,000 stars have been discovered: they’ve lower than 3% of the Sun’s metallic focus.
Another step was to verify whether or not the clusters had been typical of the Milky Way, or whether or not they belonged to different smaller galaxies that host much less metallic stars. The downside was solved by the location of the stars – at the middle of the galaxy – and figuring out a special rotation course of for younger stars.
The group positioned in the galactic middle can’t rotate with different stellar objects, which signifies that it existed on this area earlier than the formation of the thick disk of the Milky Way – the first of which – prompted the spiral motion of those objects. rotation.
Originally the Milky Way was not a spiral galaxy, it turned a “disk” galaxy and is presently rotating quickly. According to scientists, solely the photo voltaic system by which the Earth is positioned travels 900 thousand kilometers of area each hour. Therefore, the historical stars discovered by scientists who had been at the starting of the galaxy can’t transfer. Rather, they “mix out and in of the galactic embrace.”
In addition, the protogalaxy is positioned in the “core” of the Milky Way and stays compact, which means that it has remained unchanged since the starting of the accretion movement. It in all probability hit one galaxy after which stopped hitting others.