WALLABY Pilot Survey: Public release of HI data for almost 600 galaxies from phase 1 of ASKAP pilot observations

Abstract

We present WALLABY pilot data release 1, the first public release of HI pilot survey data from the Wide-field ASKAP L-band Legacy All-sky Blind Survey (WALLABY) on the Australian Square Kilometre Array Pathfinder. Phase 1 of the WALLABY pilot survey targeted three $60{\mathrm{deg}}^2$ regions on the sky in the direction of the Hydra and Norma galaxy clusters and the NGC 4636 galaxy group, covering the redshift range of z < 0.08. The source catalogue, images and spectra of nearly 600 extragalactic HI detections and kinematic models for 109 spatially resolved galaxies are available. As the pilot survey targeted regions containing nearby group and cluster environments, the median redshift of the sample of z ~ 0.014 is relatively low compared to the full WALLABY survey. The median galaxy HI mass is $2.3\times 10^9{M}_{\odot }$. The target noise level of 1.6 mJy per $30^{\prime \prime }$ beam and 18.5 kHz channel translates into a $5\sigma$ HI mass sensitivity for point sources of about $5.2\times 10^8(D_{\mathrm{L}}/100\mathrm{Mpc}{)}^2{M}_{\odot }$ across 50 spectral channels (~200 km/s) and a $5\sigma$ HI column density sensitivity of about $8.6\times 10^{19}(1+z{)}^4{\mathrm{cm}}^{-2}$ across 5 channels (~20 km/s) for emission filling the $30^{\prime \prime }$ beam. As expected for a pilot survey, several technical issues and artefacts are still affecting the data quality. Most notably, there are systematic flux errors of up to several 10% caused by uncertainties about the exact size and shape of each of the primary beams as well as the presence of sidelobes due to the finite deconvolution threshold. In addition, artefacts such as residual continuum emission and bandpass ripples have affected some of the data. The pilot survey has been highly successful in uncovering such technical problems, most of which are expected to be addressed and rectified before the start of the full WALLABY survey.

24 pages, 13 figures, 5 tables, accepted for publication in PASA

References in corpus (12)

• High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
• The Five-Hundred-Meter Aperture Spherical Radio Telescope (FAST) Project
• Multi-Scale CLEAN deconvolution of radio synthesis images
• The Dawes Review 9: The role of cold gas stripping on the star formation quenching of satellite galaxies
• SoFiA 2 -- An automated, parallel HI source finding pipeline for the WALLABY survey
• The ISM scaling relations in DustPedia late-type galaxies: A benchmark study for the Local Universe
• Collimated synchrotron threads linking the radio lobes of ESO137-006
• The Norma Cluster (ACO 3627): I. A Dynamical Analysis of the Most Massive Cluster in the Great Attractor
• 2D Bayesian automated tilted-ring fitting of disk galaxies in large HI galaxy surveys: 2DBAT
• The growth rate of cosmic structures in the local Universe with the ALFALFA survey
• WALLABY Early Science - II. The NGC 7232 galaxy group
• The Distance and Peculiar Velocity of the Norma cluster (ACO 3627) using the Near-Infrared $J$ and $K_s$-band Fundamental Plane Relations

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