Ultra-diffuse galaxies have generated significant interest due to their large optical extents and low optical surface brightnesses, which challenge galaxy formation models. Here we present resolved synthesis observations of 12 H i-bearing ultra-diffuse galaxies (HUDs) from the Karl G. Jansky Very Large Array (VLA), as well as deep optical imaging from the WIYN 3.5-meter telescope at Kitt Peak National Observatory. We present the data processing and images, including total intensity H i maps and H i velocity fields. The HUDs show ordered gas distributions and evidence of rotation, important prerequisites for the detailed kinematic models in Mancera Pi˜na et al. (2019b). We compare the H i and stellar alignment and extent, and find the H i extends beyond the already extended stellar component and that the H i disk is often misaligned with respect to the stellar one, emphasizing the importance of caution when approaching inclination measurements for these extreme sources. We explore the H i mass-diameter scaling relation, and find that although the HUDs have diffuse stellar populations, they fall along the relation, with typical global H i surface densities. This resolved sample forms an important basis for more detailed study of the H i distribution in this extreme extragalactic population.
Gault, Lexi; Leisman, Lukas; Adams, Elizabeth A.K.; Mancera Piña, Pavel E.; Reiter, Kameron; Smith, Nicholas; Battipaglia, Michael; Cannon, John M.; Fraternali, Filippo; Haynes, Martha P.; McAllan, Elizabeth; Pagel, Hannah J.; Rhode, Katherine L.; Salzer, John J.; and Singer, Quinton, "VLA Imaging of H i-bearing Ultra-Diffuse Galaxies from the ALFALFA Survey" (2020). Physics and Astronomy Faculty Publications. 186.