An Unexplained Origin for the Unusual Globular Cluster System in the Ultra-diffuse Galaxy FCC 224

Yimeng Tang, Aaron J. Romanowsky, Jonah S. Gannon +9

We study the quiescent ultra-diffuse galaxy FCC 224 in the Fornax cluster using Hubble Space Telescope (HST) imaging, motivated by peculiar properties of its globular cluster (GC)…