Shredded “stellar streams” can lead to the lack of dark matter in the Milky Way

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A vast river of stars swirls Milky WayCut against the flow of our galactic halo in a complex gravity dance.According to new studies of these so-called stellar streams, their eccentric orbits may be the key to revealing invisible streams. Dark matter Lurking in our galaxy.

This study has been approved for publication in the Astrophysical Journal and can be read in the preprint database. arXiv.org — An international team of astronomers used observations from two telescopes to map the orbits, velocities, and compositions of 12 stellar streams across the Milky Way.

The stellar stream is the wreckage of an ancient collision between the Milky Way and an adjacent small cluster of stars.When these petite neighbors come into contact with the relatively huge Milky Way, our galaxy gravity It pulls and distorts them, sometimes pulling them into spaghettiized strands that orbit the edges of our galaxy.

The position of the stars in a dozen streams seen across the sky. In the background, the stars of the Milky Way from the European Space Agency’s Gaia project are shown. (Image credits: Ting Li, S5 collaboration and European Space Agency)

The team used a computer model to rewind these stretched streams and determine where they came from. Based on the speed and composition of the stars in each stream, the team teamed up with six of the streams coming from nearby dwarf galaxies (small galaxies with up to billions of stars), while the other six are globular clusters. (Much smaller gravity-a combined body containing up to thousands of stars).

Shredded “stellar streams” can lead to the lack of dark matter in the Milky Way

Source link Shredded “stellar streams” can lead to the lack of dark matter in the Milky Way

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