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Shredded ‘stellar streams’ could lead to the Milky Way’s missing dark matter

An unlimited river of stars swirls Milky WayLower in opposition to the movement of our galactic halo in a posh gravity dance.In accordance to new research of those so-called stellar streams, their eccentric orbits could also be the key to revealing invisible streams. Dark matter Lurking in our galaxy.

This research has been authorized for publication in the Astrophysical Journal and could be learn in the preprint database. arXiv.org — A world workforce of astronomers used observations from two telescopes to map the orbits, velocities, and compositions of 12 stellar streams throughout the Milky Means.

The stellar stream is the wreckage of an historical collision between the Milky Means and an adjoining small cluster of stars.When these petite neighbors come into contact with the comparatively big Milky Means, our galaxy gravity It pulls and distorts them, typically pulling them into spaghettiized strands that orbit the edges of our galaxy.

The place of the stars in a dozen streams seen throughout the sky. In the background, the stars of the Milky Means from the European House Company’s Gaia venture are proven. (Picture credit: Ting Li, S5 collaboration and European House Company)

The workforce used a pc mannequin to rewind these stretched streams and decide the place they got here from. Primarily based on the velocity and composition of the stars in every stream, the workforce teamed up with six of the streams coming from close by dwarf galaxies (small galaxies with up to billions of stars), whereas the different six are globular clusters. (A lot smaller gravity-a mixed physique containing up to 1000’s of stars).

Shredded ‘stellar streams’ could lead to the Milky Means’s missing dark matter Source link Shredded ‘stellar streams’ could lead to the Milky Means’s missing dark matter


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