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The Milky Way suffered a great shock between 8,000 and 10,000 million years ago against a smaller object, dubbed the "sausage galaxy". A collision that was a decisive event in the beginnings of our galaxy to redefine its structure.
The cosmic shock formed both the inner core and the outer halo of the Milky Way according to a series of studies conducted by an international group of scientists published in monthly records of the Royal Astronomical Society , The Astrophysical Journal Letters and arXiv.org
Simulation of galaxy fusion. The Milky Way is represented in grayscale, while the accreted stars are represented in red.
— Gaia Sausage —
Astronomers believe that between 8,000 and 10,000 million years ago, an unknown dwarf galaxy has rushed into the Milky Way and did not survive the impact, broke it quickly and its remains are still around us .
"The collision broke the dwarf galaxy, which let its stars move in very radial orbits", which are long and narrow like needles, he explained in a Vassily Belokurov, of the 39, University of Cambridge (United Kingdom) and the New York Flatiron Institute
The trajectory of these stars brought them closer to the center of the Milky Way, which, for Belokurov, is a "sign revealing that the dwarf galaxy has entered a truly eccentric orbit and that its fate has been sealed. "
The team used satellite data from the European Space Agency which map the contents of our Alaxia g and recording the positions of the stars.
The trajectories of the stars after this shock earned him the nickname of "Gaia Sausage". explained Wyn Evans of Cambridge University, because when tracing the velocities and trajectories of stars, the shape that remained was that of this food.
Our galaxy continued to collide with other galaxies as the "insignificant galaxy of dwarf Sagittarius", but the "galaxy of sausages" was much more massive.
When this dwarf galaxy crashed into the Milky Way " its penetrating trajectory caused a great deal of chaos The Milky Way disk probably swelled or even went sour fractured after impact and should have regrown. "
Astronomers have indicated that evidence of remodeling from our galaxy is seen in the trajectory of stars inherited from this" sausage galaxy " .
Alis Deason, of the British University of Durham, pointed out that the stars from the "sausage galaxy" all turn at the same distance "from the center of the Milky Way
These turns shaped of U cause a marked decrease in the density of the stellar halo of the Milky Way where the stars change direction.
They also identified at least eight large spherical clusters, called globular clusters, which were also introduced into the milky way by the "sausage galaxy".
Source: EFE
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