Astronomy: many stars in the milk strain experienced gigantic collision

Astronomy: Many stars in the milk strain experienced gigantic collision

When the milk strain collided with another galaxy about 10 billion years ago, a substantial part of the stars had already emerged. This has found a group of researchers and researchers, inter alia, on the basis of data of space telescopes kepler and gaia and thus confirmed existing theories. They served the relatively young discipline of asteroseismology, they continue to explain. It is closed from the radiation frequency of certain stars on their internal structure and, among other things, on their age.

Different star populations found

That the dairy strain was collided in her breakfast story with another galaxy, a few years ago was proven with the space telescope gaia. Since 2013, gaia has been photographing with a gigapixel camera continuously the starry sky. By means of the parallax residual, the position of oppositely stars and over time also determine their relative movement. A goal of the mission was to find different streams of stars on this way and reconstruct the early history of our home galaxy. With the discovery of the coarse collision completely at the beginning, this goal had been achieved in an impressive way.

(source: koppelman, villalobos helmi, kapteyn astronomical institute, university of groningen, the netherlands)

Like the researchers and researchers around josefina montalban from the university of birmingham now explained, they were able to determine precise age information for a series of stars by means of asteroseismology. This group included stars, which was clear thanks to the gaia data that they originated them in the milk strain and those who came from outside explain them in the trade magazine nature astronomy. They come from the dwarf galaxy with which the milk strain collided and the now has received the name gaia-enceladus. A substantial part of the stars of the milk strab was therefore already created at the time of the collision more than 10 billion years ago and is now in their thick disc. For comparison: our sun is about 4.5 billion years old, as well as the earth.