Tidal Distortions in NGC1052-DF2 and NGC1052-DF4: Independent Evidence for a Lack of Dark Matter

Understand

Two ultra diffuse galaxies in the same group, NGC1052-DF2 and NGC1052-DF4, have been found to have little or no dark matter and to host unusually luminous globular cluster populations.

• Such low mass diffuse objects in a group environment are easily disrupted and are expected to show evidence of tidal distortions.
• In this work we present deep new imaging of the NGC1052 group, obtained with the Dragonfly Telephoto Array, to test this hypothesis.
• We find that both galaxies show strong position angle twists and are significantly more elongated at their outskirts than in their interiors.