WALLABY – an SKA Pathfinder H i survey

2020/02/18 by Bärbel S. Koribalski, B. S. Koribalski, L. Staveley-Smith +73 · 1 voice · 223 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Context (archaeology) #Cosmology #Field galaxy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Pathfinder #Radio Astronomy Observations and Technology #Redshift #Sky #astro-ph.CO #astro-ph.GA #astro-ph.IM

paper · pdf · doi:10.1007/s10509-020-03831-4

published in Astrophysics and Space Science 365(7) (Springer Science+Business Media) · Accepted for publication in ApSS (38 pages, 14 figures), see also https://www.atnf.csiro.au/research/WALLABY/ - Contact email: [email protected]

arxiv published 2020/02/18 · openalex created_date 2020/02/24 · openalex publication_date 2020/07/01 · arxiv created 2020/07/07 · arxiv updated 2020/07/20 · openalex updated_date 2026/08/05

Abstract

The Widefield ASKAP L-band Legacy All-sky Blind surveY (WALLABY) is a next-generation survey of neutral hydrogen (HI) in the Local Universe. It uses the widefield, high-resolution capability of the Australian Square Kilometer Array Pathfinder (ASKAP), a radio interferometer consisting of 36 x 12-m dishes equipped with Phased-Array Feeds (PAFs), located in an extremely radio-quiet zone in Western Australia. WALLABY aims to survey three-quarters of the sky (-90 degr < Dec < +30 degr) to a redshift of z < 0.26, and generate spectral line image cubes at ~30 arcsec resolution and ~1.6 mJy/beam per 4 km/s channel sensitivity. ASKAP's instantaneous field of view at 1.4 GHz, delivered by the PAF's 36 beams, is about 30 sq deg. At an integrated signal-to-noise ratio of five, WALLABY is expected to detect over half a million galaxies with a mean redshift of z ~ 0.05 (~200 Mpc). The scientific goals of WALLABY include: (a) a census of gas-rich galaxies in the vicinity of the Local Group; (b) a study of the HI properties of galaxies, groups and clusters, in particular the influence of the environment on galaxy evolution; and (c) the refinement of cosmological parameters using the spatial and redshift distribution of low-bias gas-rich galaxies. For context we provide an overview of previous large-scale HI surveys. Combined with existing and new multi-wavelength sky surveys, WALLABY will enable an exciting new generation of panchromatic studies of the Local Universe. - First results from the WALLABY pilot survey are revealed, with initial data products publicly available in the CSIRO ASKAP Science Data Archive (CASDA).

Citations

• THE VELA CLOUD: A GIANT H I ANOMALY IN THE NGC 3256 GROUP
• Gas deficiency in cluster galaxies - A comparison of nine clusters
• THE WIDE-FIELD INFRARED SURVEY EXPLORER (WISE): MISSION DESCRIPTION AND INITIAL ON-ORBIT PERFORMANCE
• A Pilot Survey of H i in Field Galaxies at Redshift z ~ 0.2
• The Two Micron All Sky Survey (2MASS)
• H i in group interactions: HCG 44
• Overview of the DESI Legacy Imaging Surveys
• The Effelsberg Bonn H I Survey (EBHIS)

Cited by

• The cold interstellar medium of galaxies in the Local Universe
• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• WALLABY pilot survey: the extensive interaction of NGC 4532 and DDO 137 with the Virgo cluster
• A Catalog of Galactic Atomic Hydrogen Position-Position-Velocity Filaments
• HI Content of Group Galaxies from the FAST All Sky HI Survey
• WALLABY Pilot Survey: Characterizing Low Rotation Kinematically Modelled Galaxies
• WALLABY pre-pilot and pilot survey: The Tully Fisher relation in Eridanus, Hydra, Norma, and NGC4636 fields
• Testing anisotropic Hubble expansion
• Constraining Baryon Fractions in Galaxy Groups and Clusters with the First CHIME/FRB Outrigger
• Decoding the Single-peaked HI Spectra of Low Redshift Post-starburst Galaxies
• Effective Theories of Redshift-Space Galaxy Peculiar Velocities
• A Catalog of Galactic Supernova Remnants and Supernova Remnant Candidates from the EMU/POSSUM Radio Sky Surveys. I
• DESI EDR: Calibrating the Tully-Fisher Relationship with the DESI Peculiar Velocity Survey
• Environmental Quenching of Low-surface-brightness Galaxies Near Hosts from Large Magellanic Cloud to Milky Way Mass Scales
• Pavo: Stellar feedback in action in a low-mass dwarf galaxy
• EDGE: What shapes the relationship between HI and stellar observables in faint dwarf galaxies?
• Imprint of baryons and massive neutrinos on velocity statistics
• The Distance and Peculiar Velocity of the Norma Cluster (ACO3627) Using the Near-infrared J- and K s -band Fundamental Plane Relations
• Quantifying the fine structures of disk galaxies with deep learning: Segmentation of spiral arms in different Hubble types
• Widefield ASKAP L-Band Legacy All-Sky Blind Survey [wikipedia]

Discussions

• An SKA Pathfinder called WALLABY, an appropriate name for its west-Australian location https://arxiv.org/abs/2002.07311 https://atnf.csiro.au/research/WALLABY/ [bsky, 0 points, 0 comments]

Related

• WALLABY Pilot Survey: Public data release of ~1800 HI sources and high-resolution cut-outs from Pilot Survey Phase 2
• WALLABY Pilot Survey: An 'Almost' Dark Cloud near the Hydra Cluster
• WALLABY pilot survey: properties of HI-selected dark sources and low surface brightness galaxies
• Australian SKA Pathfinder: A High-Dynamic Range Wide-Field of View Survey Telescope
• WALLABY pre-pilot and pilot survey: The Tully Fisher relation in Eridanus, Hydra, Norma, and NGC4636 fields