The Detection of a Massive Chain of Dark H i Clouds in the GAMA G23 Field

We report on the detection of a large, extended H i cloud complex in the Galaxy and Mass Survey G23 field, located at a redshift of z similar to 0.03, observed as part of the MeerKAT Habitat of Galaxies Survey campaign (a pilot survey to explore the mosaicing capabilities of the MeerKAT telescope). The cloud complex, with a total mass of 10(10.0) M (circle dot), lies in proximity to a large galaxy group with M (dyn) similar to 10(13.5) M (circle dot). We identify seven H ? peak concentrations, interconnected as a tenuous chain structure, extending similar to 400 kpc from east to west, with the largest (central) concentration containing 10(9.7) M (circle dot) in H ? gas distributed across 50 kpc. The main source is not detected in ultraviolet, optical, or infrared imaging. The implied gas mass-to-light ratio (M (H I)/L (r)) is extreme (>1000) even in comparison to other dark clouds. The complex has very little kinematic structure (110 km s(-1)), making it difficult to identify cloud rotation. Assuming pressure support, the total mass of the central concentration is > 10(10.2) M (circle dot), while a lower limit to the dynamical mass in the case of full rotational support is 10(10.4) M (circle dot). If the central concentration is a stable structure, it has to contain some amount of unseen matter, but potentially less than is observed for a typical galaxy. It is, however, not clear whether the structure has any gravitationally stable concentrations. We report a faint UV-optical-infrared source in proximity to one of the smaller concentrations in the gas complex, leading to a possible stellar association. The system nature and origins is enigmatic, potentially being the result of an interaction with or within the galaxy group it appears to be associated with.