Deep ASKAP EMU Survey of the GAMA23 field: Properties of radio sources

Abstract

We present the Australian Square Kilometre Array Pathfinder (ASKAP) observations of the Galaxy and Mass Assembly (GAMA)-23h field. The survey was carried out at 887.5 MHz and covers a 83 square degree field. We imaged the calibrated visibility data, taken as part of the Evolutionary Mapping of Universe (EMU) Early Science Programme, using the latest version of the ASKAPSoft pipeline. The final mosaic has an angular resolution of 10 arcsec and a central rms noise of around 38 $\mu$Jy beam${}^{-1}$. The derived radio source catalogue has 39812 entries above a peak flux density threshold of 5$\sigma$. We searched for the radio source host galaxy counterparts using the GAMA spectroscopic (with an i-band magnitude limit of 19.2 mag) and multi-wavelength catalogues that are available as part of the collaboration. We identified hosts with GAMA spectroscopic redshifts for 5934 radio sources. We describe the data reduction, imaging, and source identification process, and present the source counts. Thanks to the wide area covered by our survey, we obtain very robust counts down to 0.2 mJy. ASKAP's exceptional survey speed, providing efficient, sensitive and high resolution mapping of large regions of the sky in conjunction with the multi-wavelength data available for the GAMA23 field, allowed us to discover 63 giant radio galaxies. The data presented here demonstrate the excellent capabilities of ASKAP in the pre-SKA era.

18 pages, 15 figures, accepted by MNRAS

References in corpus (47)

• The Host Galaxies and Classification of Active Galactic Nuclei
• EAZY: A Fast, Public Photometric Redshift Code
• The LOFAR Two-metre Sky Survey - I. Survey Description and Preliminary Data Release
• GaLactic and Extragalactic All-sky Murchison Widefield Array (GLEAM) survey I: A low-frequency extragalactic catalogue
• The LOFAR Two-metre Sky Survey -- V. Second data release
• Australian Square Kilometre Array Pathfinder: I. System Description
• The Rapid ASKAP Continuum Survey I: Design and First Results
• Science With The Australian Square Kilometre Array Pathfinder
• Galaxy And Mass Assembly (GAMA): Data Release 4 and the z < 0.1 total and z < 0.08 morphological galaxy stellar mass functions
• WALLABY -- An SKA Pathfinder HI Survey
• The Rapid ASKAP Continuum Survey Paper II: First Stokes I Source Catalogue Data Release
• LOFAR/H-ATLAS: The low-frequency radio luminosity - star-formation rate relation
• LOFAR/H-ATLAS: A deep low-frequency survey of the Herschel-ATLAS North Galactic Pole field
• The VLA-COSMOS 3~GHz Large Project: Cosmic evolution of radio AGN and implications for radio-mode feedback since z~5
• The cosmic evolution of radio-AGN feedback to z=1
• Galaxy Evolution in the Radio Band: The Role of Starforming Galaxies and Active Galactic Nuclei
• The LOFAR LBA Sky Survey I. survey description and preliminary data release
• The LOFAR Two-metre Sky Survey Deep fields: The star formation rate - radio luminosity relation at low frequencies
• The Herschel-ATLAS Data Release 1 Paper II: Multi-wavelength counterparts to submillimetre sources
• HELP: The Herschel Extragalactic Legacy Project
• The Australian Square Kilometre Array Pathfinder: Performance of the Boolardy Engineering Test Array
• Galaxy And Mass Assembly (GAMA): Assimilation of KiDS into the GAMA database
• Sub-arcsecond imaging with the International LOFAR Telescope I. Foundational calibration strategy and pipeline
• Photometric redshifts for the next generation of deep radio continuum surveys - I: Template fitting
• The duty cycle of radio galaxies revealed by LOFAR: remnant and restarted radio source populations in the Lockman Hole
• Accretion mode versus radio morphology in the LOFAR Deep Fields
• Galaxy And Mass Assembly (GAMA): Active Galactic Nuclei in Pairs of Galaxies
• RAiSE II: resolved spectral evolution in radio AGN
• The radio loudness of SDSS quasars from the LOFAR Two-metre Sky Survey: ubiquitous jet activity and constraints on star formation
• The Herschel-ATLAS Data Release 2, Paper I. Submillimeter and Far-infrared Images of the South and North Galactic Poles: The Largest Herschel Survey of the Extragalactic Sky
• Extremely deep 150 MHz source counts from the LoTSS Deep Fields
• The MAGPI Survey -- science goals, design, observing strategy, early results and theoretical framework
• Source Counts Spanning Eight Decades of Flux Density at 1.4 GHz
• Radio Detection of VIK J2318$-$3113, the Most Distant Radio-Loud Quasar ($z$=6.44)
• FLASH Early Science -- Discovery of an intervening HI 21-cm absorber from an ASKAP survey of the GAMA 23 field
• Deep GMRT 610 MHz Observations of the ELAIS N1 Field : Catalogue and Source Counts
• The ASKAP-EMU Early Science Project: 888 MHz Radio Continuum Survey of the Large Magellanic Cloud
• A population of galaxy-scale jets discovered using LOFAR
• Hard X-ray selected giant radio galaxies -- II. Morphological evidence of restarted radio activity
• On the Environments of Giant Radio Galaxies
• The ASKAP-EMU Early Science Project:Radio Continuum Survey of the Small Magellanic Cloud
• Using 21-cm absorption surveys to measure the average HI spin temperature in distant galaxies
• Gravitational lensing in LoTSS DR2 -- Extremely faint 144-MHz radio emission from two highly magnified quasars
• ASKAP Commissioning Observations of the GAMA 23 Field
• PKS 2250$-$351: A Giant Radio Galaxy in Abell 3936
• The Evolution of the Low-Frequency Radio AGN Population to $z\simeq 1.5$ in the ELAIS N1 Field
• VLA Snapshot Continuum Survey of FRI Quasar Candidates Selected from the LOFAR Two-Metre Sky Survey (LoTSS)