A recent Nature paper has claimed identification of  an "ultra-diffuse galaxy" which lacks a dark matter halo. This conclusion is based on studying the kinematics of 10 "globular cluster-like" objects which are assumed to orbit the galaxy.  If correct, this would be an interesting example of a galaxy which consists purely of a baryonic component and strongly contrasts with other UDGs which appear to be dark matter dominanted.  This result is not without its controversy and I will discuss the main results of the paper and possible problems with their analysis.

(see also accompanying paper: "An Enigmatic Population of Luminous Globular Clusters in a Galaxy Lacking Dark Matter", van Dokkum et al., 2018, ApJ, 856, 30)

Coffee and cookies will be served in the library afterwards.