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It is the largest dwarf galaxy to crush us but still found
An artist's impression of the milky way colliding with the galaxy of sausages. Image credit: V. Belokurov (Cambridge, United Kingdom); According to the image of ESO / Juan Carlos Muñoz
About eight to ten billion years ago, a nearby dwarf galaxy called the galaxy of sausages hit the path Milky leaving a handful of gas, dust and stars. astrophysicists have traced the remains of debris to reconstruct the cosmic catastrophe detailed in an article published in the Monthly Notices of the Royal Astronomical Society
"The collision shredded the dwarf, letting his stars move in very radial orbits" Vasily Belokurov, first author of the article and researcher at the University of Cambridge and at the Center for Computational Astrophysics of the Flatiron Institute
<p "We traced the velocities of the stars, At the moment the smallest galaxy is disintegrated, its stars have been thrown into very radial orbits: these sausage stars are what remains of the last major fusion of the Milky Way, "said Wyn Evans, co-author of the article and professor of astronomy at the University of Cambridge.
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They think that the galaxy of sausages is the largest dwarf galaxy to collide with the Milky Way nowadays. Its total mbad including gas, stars and dark matter is more than 10 billion times more mbadive than the Sun. He transmitted much of this material to the young Milky Way, creating the swollen bulge at the center of his spiral, and the star ring in the stellar halo region
"The stars of the sausage are spinning all around the same distance from the center of the galaxy, "said Alis Deason, co-author of the article and a researcher at the Institute of Computational Cosmology at the University of Durham.
Simulations computer remodeling of the accident also shows that the galaxy sausage has given the Milky Way: eight large, concentrated spots of stars called globular clusters – a feature that is not normally seen in small dwarf galaxies.
"Although there have been many dwarf satellites falling on the Milky Way during its lifetime," said Sergey Koposov, co-author of the article and badistant professor at the # Carnegie Mellon University.
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