A serendipitous discovery of HI-rich galaxy groups with MeerKAT
arxiv(2024)
摘要
We report on the serendipitous discovery of 49 HI-rich galaxies in a 2.3 hour
Open Time observation with MeerKAT. We present their properties including their
HI masses, intensity and velocity maps, and spectra. We determine that at least
three HI-rich galaxy groups have been detected, potentially as part of a
supergroup. Some members of these galaxy groups show clear interaction with
each other in their HI emission. We cross-match the detections with PanSTARRS,
WISE and GALEX, and obtain stellar masses and star formation rates. One source
is found to be a potential OH megamaser, but further follow-up is required to
confidently determine this. For 6 sources with sufficient spatial resolution in
HI we produce rotation curves with BBarolo, generate mass models, and derive a
dark matter halo mass. While the number of galaxies detected in this relatively
short pointing appears to be at the high end of expectations compared to other
MeerKAT observations and group HIMF studies, this finding highlights the
capability of MeerKAT for other serendipitous discoveries, and the potential
for many more HI-rich galaxies to be revealed within both existing and upcoming
Open Time datasets.
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