Atomic Gas in Blue Ultra Diffuse Galaxies around Hickson Compact Groups
Kristine Spekkens (1, 2), Ananthan Karunakaran (2) ((1) RMCC, (2), Queen's)

TL;DR
This study investigates the atomic gas content of blue ultra diffuse galaxies near Hickson Compact Groups, confirming their nature, measuring their properties, and exploring their relation to galaxy formation theories.
Contribution
It provides the first direct measurements of HI in blue UDGs near HCGs, linking their gas properties to their sizes and halo characteristics.
Findings
Blue UDGs are gas-rich and have high-spin halos.
Their HI masses correlate with effective radii.
Most are gravitationally bound to nearby HCGs.
Abstract
We have found the atomic gas (HI) reservoirs of the blue ultra diffuse galaxy (UDG) candidates identified by R\'oman and Trujillo in images near Hickson Compact Groups (HCGs). We confirm that all of the objects are indeed UDGs with effective radii R_e > 1.5 kpc. Three of them are likely to be gravitationally bound to the HCG near which they project, one is plausibly gravitationally bound to the nearest HCG, and one is in the background. We measure HI masses and velocity widths for each object directly from the spectra, and use the widths together with the UDG effective radii to estimate dynamical masses and halo spin parameters. The location of the blue UDGs in the HI mass - stellar mass plane is consistent with that of the broader gas-rich galaxy population, and both their HI masses and gas richnesses are correlated with their effective radii. The blue UDGs appear to be low-mass…
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