Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 446, Issue 4, Pages 3526-3544Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu2241
Keywords
galaxies: evolution; galaxies: fundamental parameters; galaxies: kinematics and dynamics; radio lines: galaxies
Categories
Funding
- Australian Research Council [FT120100660, DP130100664]
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- American Museum of Natural History
- Astrophysical Institute Potsdam
- University of Basel
- University of Cambridge
- Case Western Reserve University
- University of Chicago
- Drexel University
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Joint Institute for Nuclear Astrophysics
- Kavli Institute for Particle Astrophysics and Cosmology
- Korean Scientist Group
- Chinese Academy of Sciences (LAMOST)
- Los Alamos National Laboratory
- Max-Planck-Institute for Astronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- New Mexico State University
- Ohio State University
- University of Pittsburgh
- University of Portsmouth
- Princeton University
- United States Naval Observatory
- University of Washington
- Australian Research Council [FT120100660] Funding Source: Australian Research Council
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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, disc-dominated systems in relatively isolated environments, with stellar and HI masses larger than 10(10) M-circle dot and redshifts 0.17 <= z <= 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 disc 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 discs identified at z similar to 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 Kilometre Array and its pathfinders.
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