The galaxy that gave birth to the Milky Way was discovered by the Gaia telescope
revealed on 09/22/2022, 16:57 / up to date on 09/22/2022, 16:58
In the center of a gaggle of two million stars situated in the area of the heart of the Milky Way is the origin of the galaxy. The proto-galaxy, thought-about the “outdated and poor” coronary heart of the cluster, is close to the constellation Sagittarius, which will be seen to the left. – (credit score: TERENCE DICKINSON/ESA)
At the heart of the Milky Way is a “poor outdated coronary heart” that gave birth to the nice star cluster, and after 12.5 billion years it’s nonetheless “beating” and alive. The discovery comes from scientists at the Max Planck Institute for Astronomy, who’ve recognized a protogalaxy that gave rise to the nice highly effective spiral that homes the Earth, the Solar System and 1000’s of different techniques.
Physicists clarify: a galaxy the measurement of the Milky Way didn’t type by itself. It turns into high-magnitude from a merger movement with different smaller galaxies—or, in astronomers’ phrases, a cannibal movement with a number of star clusters.
However, it takes a galaxy to begin shifting, and till then this primordial star cluster was out of sight for astronomers. In a examine revealed by German scientists at the Max Planck Institute for Astronomy on September 7, the group provides the world of astronomy excellent news: the coronary heart of the Milky Way has been discovered – and it’s outdated and “poor” in metals.
Using information obtained from the Gaia telescope, astronomers analyzed about 2 million stars in the area of the heart of the galaxy, close to the area of the constellation Sagittarius, and recognized 18,000 historic stars that have traits of being as outdated as the predicted origin. from the Milky Way, 12.5 billion years outdated.
“People have lengthy speculated that such an enormous inhabitants (of historic stars) should have existed in the heart of our Milky Way, and Gaia now reveals that they’re there,” says astronomer Hans-Walter Ricks of the Max Planck Institute for Astronomy. in Heidelberg, Germany.
To decide whether or not the protogalaxy was the origin of the galaxy, scientists analyzed them in depth. The first step was to assess whether or not they have been certainly historic stars—an order of stellar objects that are extraordinarily metal-poor and consist principally of hydrogen and helium, thought-about much less large. The reply was constructive: the 18,000 stars discovered: they’ve lower than 3% of the focus of metals in the Sun.
Another step was to verify whether or not the cluster of stars was authentic to the Milky Way or whether or not they belonged to different smaller galaxies that may additionally include low-metal stars. The drawback was solved by the location of the stars – at the heart of the galaxy – and figuring out a special rotation course of for the youthful ones.
The group is in the galactic heart, unable to rotate with the different stellar objects, revealing that it was in the area earlier than the look of the Milky Way’s thick disk – the first of those – which prompted the objects to spiral into rotation.
In the starting, the Milky Way was not a spiral galaxy, it turned a “disk” galaxy and is at present spinning quickly. The photo voltaic system alone, during which the Earth is situated, in accordance to scientists, passes by means of 900 thousand kilometers of area each hour. Therefore, the historic stars discovered by scientists, which have been at the starting of the galaxy, can’t make the motion. Instead, they “dive out and in of the arms of the galaxy.”
In addition, the protogalaxy is in the “core” of the Milky Way and stays compact, that means that it has remained intact since the starting of the progress movement. It in all probability crashed into one galaxy after which stopped crashing into others.