Constraining Dark Matter with the Musket Ball Cluster
I have been leading the effort to study in detail a newly discovered dissociative galaxy cluster merger (DLSCL J0916.2+2951 a.k.a the Musket Ball Cluster), were the collisionless dark matter (blue, in the figure) and galaxies have become separated from the collisional cluster gas (red, in the figure). To date only ten dissociative mergers have been confirmed, the most famous being the Bullet Cluster. These dissections of the cosmos are proving to be some of the best laboratories for studying dark matter.
For a more detailed account see our journal article "Discovery of a Dissociative Galaxy Cluster Merger with Large Physical Separation".