Dragonfly 44: A Mysterious Galaxy Made of Mostly Dark Matter

If dark matter is, well, dark how can it be found? Remarkably, a team of astronomers found a galaxy made almost entirely of dark matter by using several powerful telescopes. The galaxy is called Dragonfly 44 and was largely ignored because it is so faint and seemingly insignificant.
On closer look with Dragonfly Telephoto Array, it appeared that this galaxy in the constellation Coma deserved a closer look. Using the large telescopes in Hawaii they found a number of stars and measured their velocities and found a surprising result.
Join Tony Darnell and Carol Christian as they discuss with Dr. Pieter van Dokkum (Yale U.), Dr. Roberto Abraham (U. Toronto) and collaborators about how the object was found and the observations used to determine its “dark” secret.
Hangout made possible by .SPACE Domains:
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