Gaps in the GD-1 Star Stream

Understand

GD-1 is a long, thin, Milky Way star stream that has readily visible density variations along its length.

• We quantify the locations, sizes and statistical significance of the density structure, i.e.
• gaps, using a set of scaled filters.
• The shapes of the filters are based on the gaps that develop in simulations of dark matter sub-halos crossing a star stream.