GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey
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Open Access
- 21 June 2015
- journal article
- research article
- Published by Cambridge University Press (CUP) in Publications of the Astronomical Society of Australia
Abstract
GLEAM, the GaLactic and Extragalactic All-sky MWA survey, is a survey of the entire radio sky south of declination + 25° at frequencies between 72 and 231 MHz, made with the MWA using a drift scan method that makes efficient use of the MWA’s very large field-of-view. We present the observation details, imaging strategies, and theoretical sensitivity for GLEAM. The survey ran for two years, the first year using 40-kHz frequency resolution and 0.5-s time resolution; the second year using 10-kHz frequency resolution and 2 s time resolution. The resulting image resolution and sensitivity depends on observing frequency, sky pointing, and image weighting scheme. At 154 MHz, the image resolution is approximately 2.5 × 2.2/cos (δ + 26.7°) arcmin with sensitivity to structures up to ~ 10° in angular size. We provide tables to calculate the expected thermal noise for GLEAM mosaics depending on pointing and frequency and discuss limitations to achieving theoretical noise in Stokes I images. We discuss challenges, and their solutions, that arise for GLEAM including ionospheric effects on source positions and linearly polarised emission, and the instrumental polarisation effects inherent to the MWA’s primary beam.Keywords
This publication has 39 references indexed in Scilit:
- T-RaMiSu: the Two-meter Radio Mini SurveyAstronomy & Astrophysics, 2012
- NEW 145 MHz SOURCE MEASUREMENTS BY PAPER IN THE SOUTHERN SKYThe Astrophysical Journal Letters, 2011
- Interferometric Imaging with the 32 Element Murchison Wide-Field ArrayPublications of the Astronomical Society of the Pacific, 2010
- THE PRECISION ARRAY FOR PROBING THE EPOCH OF RE-IONIZATION: EIGHT STATION RESULTSThe Astronomical Journal, 2010
- Correcting direction-dependent gains in the deconvolution of radio interferometric imagesAstronomy & Astrophysics, 2008
- The second epoch Molonglo Galactic Plane Survey: compact source catalogueMonthly Notices of the Royal Astronomical Society, 2007
- Faraday rotation measure synthesisAstronomy & Astrophysics, 2005
- A powerful bursting radio source towards the Galactic CentreNature, 2005
- SUMSS: A Wide-Field Radio Imaging Survey of the Southern Sky. I. Science Goals, Survey Design, and InstrumentationThe Astronomical Journal, 1999
- Confusion and Flux-Density Error DistributionsThe Astrophysical Journal, 1974