BETA pilot multi-epoch continuum survey

DOI

The Boolardy Engineering Test Array is a 6x12m dish interferometer and the prototype of the Australian Square Kilometre Array Pathfinder (ASKAP), equipped with the first generation of ASKAP's phased array feed (PAF) receivers. These facilitate rapid wide-area imaging via the deployment of simultaneous multiple beams within an ~30deg^2^ field of view. By cycling the array through 12 interleaved pointing positions and using nine digitally formed beams, we effectively mimic a traditional 1hx108 pointing survey, covering ~150deg^2^ over 711-1015MHz in 12h of observing time. Three such observations were executed over the course of a week. We verify the full bandwidth continuum imaging performance and stability of the system via self-consistency checks and comparisons to existing radio data. The combined three epoch image has arcminute resolution and a 1{sigma} thermal noise level of 375{mu}Jy/beam, although the effective noise is a factor of ~3 higher due to residual sidelobe confusion. From this we derive a catalogue of 3722 discrete radio components, using the 35 per cent fractional bandwidth to measure in-band spectral indices for 1037 of them. A search for transient events reveals one significantly variable source within the survey area. The survey covers approximately two-thirds of the Spitzer South Pole Telescope Deep Field. This pilot project demonstrates the viability and potential of using PAFs to rapidly and accurately survey the sky at radio wavelengths.

Cone search capability for table J/MNRAS/457/4160/table3 (Source catalog)

Identifier
DOI http://doi.org/10.26093/cds/vizier.74574160
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/MNRAS/457/4160
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/457/4160
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/457/4160
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/MNRAS/457/4160
Provenance
Creator Heywood I.; Bannister K.W.; Marvil J.; Allison J.R.; Ball L.; Bell M.E.,Bock D.-J.; Brothers M.; Bunton J.D.; Chippendale A.P.; Cooray F.,Cornwell T.J.; De Boer D.; Edwards P.; Gough R.; Gupta N.; Harvey-Smith L.,Hay S.; Hotan A.W.; Indermuehle B.; Jacka C.; Jackson C.A.; Johnston S.,Kimball A.E.; Koribalski B.S.; Lenc E.; Macleod A.; McClure-Griffiths N.,Mcconnell D.; Mirtschin P.; Murphy T.; Neuhold S.; Norris R.P.; Pearce S.,Popping A.; Qiao R.Y.; Reynolds J.E.; Sadler E.M.; Sault R.J.,Schinckel A.E.T.; Serra P.; Shimwell T.W.; Stevens J.; Tuthill J.,Tzioumis A.; Voronkov M.A.; Westmeier T.; Whiting M.T.
Publisher CDS
Publication Year 2017
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Galactic and extragalactic Astronomy; Natural Sciences; Observational Astronomy; Physics