Spectroscopic Surveys and HI in Deep Fields

The MeerKAT (64 x 13.5m dish radio interferometer) is South Africa's precursor instrument for the Square Kilometre Array (SKA), exploring dish design, instrumentation, and the characteristics of a Karoo desert site and is projected to be on sky in 2016. One of two top-priority, Key Projects is a single deep field, integrating for ~5000 hours total with the aim to detect neutral atomic hydrogen through its 21 cm line emission out to redshift unity and beyond. Key for maximizing science with LADUMA is additional spectroscopic information; to identify OH masers, as a prior for HI stacking, and for the star-formation and metallicity indicators. Stacking is especially useful to maximize HI science at high redshift but very large and accurate catalogs of optical redshifts are needed. The LADUMA target field (CDFS) is targeted by DEVILS, WAVES and MOONRISE. I will discuss future science and expected returns.