• DOI:10.1093/mnras/stab390
• Corpus ID: 231855249

Resolved H i in two ultra-diffuse galaxies from contrasting non-cluster environments

@inproceedings{Scott2021ResolvedHI,
  title={Resolved H i in two ultra-diffuse galaxies from contrasting non-cluster environments},
  author={Tom Scott and Chandreyee Sengupta and P Lagos and Aeree Chung and O. Ivy Wong},
  year={2021}
}

• T. Scott, C. Sengupta, +2 authors O. I. Wong
• Published 8 February 2021
• Physics

We report on the first resolved H i observations of two blue ultra-diffuse galaxies (UDGs) using the Giant Metrewave Radio Telescope (GMRT). These observations add to the sofar limited number of UDGs with resolved H i data. The targets are from contrasting non– cluster environments: UDG–B1 is projected in the outskirts of Hickson Compact Group 25 and Secco–dI–2 (SdI–2) is an isolated UDG. These UDGs also have contrasting effective radii with Re of 3.7 kpc (similar to the Milky Way) and 1.3 kpc respectively. SdI–2 has an unusually large MHI M∗ ratio =28.9, confirming a previous single dish H i observation. Both galaxies display H i morphological and kinematic signatures consistent with a recent tidal interaction, which is also supported by observations from other wavelengths, including optical spectroscopy. Within the limits of the observations’ resolution our analysis indicates that SdI–2 is dark matter-dominated within its H i radius and this is also likely to be the case for UDG–B1.Our study highlights the importance of high spatial and spectral resolution H i observations for the study of the dark matter properties of UDGs.