Harvard’s Ana Bonaca says there is evidence of a “dark substructure” in the Milky Way’s halo.
Something appears to have torn a hole in part of the Milky Way’s halo. The “dark substructure” was found via Gaia observations—a project set out to produce the most detailed 3D map of our galaxy—with Harvard scientist Ana Bonaca noticing a perturbation in a tidal stream.As first reported by LiveScience, Bonaca was focusing on tidal streams produced by stars escaping from globular clusters—normally found at the edges of a galaxy. The stellar halo of the Milky Way is full of these tidal streams.
What this “perturber” is, however, is unknown."It's a dense bullet of something," Bonaca told LiveScience. Telescopes failed to find the source—so what could it be? “Observations permit a low-mass dark-matter subhalo as a plausible candidate,” Bonaca’s abstract says. Identifying a clump of dark matter “opens up the possibility that detailed observations of streams could measure the mass spectrum of dark-matter substructures and even identify individual substructures,” her abstract concludes.
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