HIGHz: A Survey of the Most HI-Massive Galaxies at z~0.2

TL;DR

The HIGHz survey studied 39 high-redshift, HI-rich, star-forming galaxies, revealing their properties and their relation to local and distant galaxy populations, providing insights into galaxy evolution and future HI observations.

Contribution

This survey presents the highest-redshift HI detections of individual galaxies and characterizes their properties as scaled-up versions of local disk galaxies.

Findings

HIGHz galaxies are consistent with baryonic Tully-Fisher relation.

They are the most HI-massive galaxies at z~0.2.

These galaxies are analogues of local HI-rich systems and relate to high-redshift turbulent disks.

Abstract

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.