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We increase the sample of ultra diffuse galaxies (UDGs) in lower densityenvironments with characterized globular cluster (GC) populations using newHubble Space Telescope observations of nine UDGs in group environments. Whilethe bulk of our UDGs have GC abundances consistent with normal dwarf galaxies,two of these UDGs have excess GC populations. These two UDGs both have GCluminosity functions consistent with higher surface brightness galaxies andcluster UDGs. We then combine our nine objects with previous studies to createa catalog of UDGs with analyzed GC populations that spans a uniquely diverserange of environments. We use this catalog to examine broader trends in the GCpopulations of low stellar mass galaxies. The highest GC abundances are foundin cluster UDGs, but whether cluster UDGs are actually more extreme requiresstudy of many more UDGs in groups. We find a possible positive correlationbetween GC abundance and stellar mass, and between GC abundance and galaxy sizeat fixed stellar mass. However, we see no significant stellar-mass galaxy-sizerelation, over our limited stellar mass range. We consider possible origins ofthe correlation between GC abundance and galaxy size, including the possibilitythat these two galaxy properties are both dependent on the galaxy dark matterhalo, or that they are related through baryonic processes like internalfeedback.

astrophysical journal/the astrophysical journal

Hyper Suprime-Cam Low Surface Brightness Galaxies II: A Hubble Space  Telescope Study of the Globular Cluster Systems of Ultra-Diffuse Galaxies in  Groups