Science, Space and Technology News 2024
Sometimes, stars can be stripped away from globular clusters as they orbit a massive galaxy. Researchers have identified several instances in our own Milky Way galaxy – and they’ve also spotted gaps between these looping tendrils. What caused those gaps? One possibility: a substance known as dark matter.
Globular cluster streams are like ribbons fluttering in the cosmos, both leading and trailing the globular clusters where they originated along their orbits. Their lengths in ourgalaxy vary wildly. Very short stellar streams are relatively young, while those that completely wrap around a galaxy may be almost as old as the universe. A stream that is fully wrapped around the Andromeda galaxy could be more than 300,000 light-years long but less than 3,000 light-years wide.
Imagine the results: Roman’s vast, exquisitely detailed images will allow researchers to easily identify many examples of globular cluster streams in Andromeda. To date, astronomers using existing telescopes in space and on the ground have been limited to studying a slightly smaller number of globular cluster streams within our Milky Way.Dark matter, which many assume to be a particle, can’t yet be observed directly, because it doesn’t emit, reflect, refract, or absorb light.
Aganze and Starkenburg estimate that Roman will efficiently deliver the data they need within nearby galaxies – requiring only a total of one hour – and that these observations may be captured by the
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