HIGHz: A Survey of the Most HI-Massive Galaxies at z~0.2
  We present the results of the HIGHz Arecibo survey, which measured the HI
content of 39 galaxies at redshift $z>0.16$ selected from the Sloan Digital Sky
Survey. These are all actively star-forming, disk-dominated systems in
relatively isolated environments, with stellar and HI masses larger than
$10^{10}$ M$_\odot$ and redshifts $0.17\leq z\leq 0.25$. Our sample includes
not only the highest-redshift detections of HI emission from individual
galaxies to date, but also some of the most HI-massive systems known. Despite
being exceptionally large, the HI reservoirs of these galaxies are consistent
with what is expected from their ultraviolet and optical properties. This, and
the fact that the galaxies lie on the baryonic Tully-Fisher relation, suggests
that HIGHz systems are rare, scaled-up versions of local disk galaxies. We show
that the most HI-massive galaxies discovered in the Arecibo Legacy Fast ALFA
survey are the local analogues of HIGHz, and discuss the possible connection
between our sample and the turbulent, gas-rich disks identified at $z\sim 1$.
The HIGHz sample provides a first glimpse into the properties of the massive,
HI-rich galaxies that will be detected at higher redshifts by the
next-generation HI surveys with the Square Kilometer Array and its pathfinders.
