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Title:
GLEAM: The GaLactic and Extragalactic All-Sky MWA Survey
Authors:
Wayth, R. B.; Lenc, E.; Bell, M. E.; Callingham, J. R.; Dwarakanath, K. S.; Franzen, T. M. O.; For, B.-Q.; Gaensler, B.; Hancock, P.; Hindson, L.; Hurley-Walker, N.; Jackson, C. A.; Johnston-Hollitt, M.; Kapinska, A. D.; McKinley, B.; Morgan, J.; Offringa, A. R.; Procopio, P.; Staveley-Smith, L.; Wu, C.; Zheng, Q.; Trott, C. M.; Bernardi, G.; Bowman, J. D.; Briggs, F.; Cappallo, R. J.; Corey, B. E.; Deshpande, A. A.; Emrich, D.; Goeke, R.; Greenhill, L. J.; Hazelton, B. J.; Kaplan, D. L.; Kasper, J. C.; Kratzenberg, E.; Lonsdale, C. J.; Lynch, M. J.; McWhirter, S. R.; Mitchell, D. A.; Morales, M. F.; Morgan, E.; Oberoi, D.; Ord, S. M.; Prabu, T.; Rogers, A. E. E.; Roshi, A.; Shankar, N. Udaya; Srivani, K. S.; Subrahmanyan, R.; Tingay, S. J.; Waterson, M.; Webster, R. L.; Whitney, A. R.; Williams, A.; Williams, C. L.
Affiliation:
AA(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia), AB(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia; Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia), AC(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia; CSIRO Astronomy and Space Science (CASS), Marsfield, NSW 2122, Australia), AD(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia; Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia; CSIRO Astronomy and Space Science (CASS), Marsfield, NSW 2122, Australia), AE(Raman Research Institute, Bangalore 560080, India), AF(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia), AG(International Centre for Radio Astronomy Research (ICRAR), University of Western Australia, Crawley, WA 6009, Australia), AH(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia; Sydney Institute for Astronomy (SIfA), School of Physics, The University of Sydney, NSW 2006, Australia; Dunlap Institute for Astronomy & Astrophysics, University of Toronto, 50 St George St, Toronto, ON M5S 3H4, Canada), AI(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia), AJ(School of Chemical & Physical Sciences, Victoria University of Wellington, Wellington 6140, New Zealand), AK(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia), AL(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia), AM(School of Chemical & Physical Sciences, Victoria University of Wellington, Wellington 6140, New Zealand), AN(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia; International Centre for Radio Astronomy Research (ICRAR), University of Western Australia, Crawley, WA 6009, Australia), AO(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia; School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia), AP(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia), AQ(Netherlands Institute for Radio Astronomy (ASTRON), PO Box 2, 7990 AA Dwingeloo, the Netherlands), AR(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia; School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia), AS(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia; International Centre for Radio Astronomy Research (ICRAR), University of Western Australia, Crawley, WA 6009, Australia), AT(International Centre for Radio Astronomy Research (ICRAR), University of Western Australia, Crawley, WA 6009, Australia), AU(School of Chemical & Physical Sciences, Victoria University of Wellington, Wellington 6140, New Zealand), AV(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia), AW(Square Kilometre Array South Africa (SKA SA), 3rd Floor, The Park, Park Road, Pinelands, 7405, South Africa; Department of Physics and Electronics, Rhodes University, PO Box 94, Grahamstown, 6140, South Africa; Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA), AX(School of Earth and Space Exploration, Arizona State University, Tempe, AZ 85287, USA), AY(Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia), AZ(MIT Haystack Observatory, Westford, MA 01886, USA), BA(MIT Haystack Observatory, Westford, MA 01886, USA), BB(Raman Research Institute, Bangalore 560080, India), BC(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia), BD(Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA), BE(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA), BF(Department of Physics, University of Washington, Seattle, WA 98195, USA), BG(Department of Physics, University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA), BH(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA; Department of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI, USA), BI(MIT Haystack Observatory, Westford, MA 01886, USA), BJ(MIT Haystack Observatory, Westford, MA 01886, USA), BK(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia), BL(MIT Haystack Observatory, Westford, MA 01886, USA), BM(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia; CSIRO Astronomy and Space Science (CASS), Marsfield, NSW 2122, Australia), BN(Department of Physics, University of Washington, Seattle, WA 98195, USA), BO(Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA), BP(National Centre for Radio Astrophysics, Tata Institute for Fundamental Research, Pune 411007, India), BQ(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia), BR(Raman Research Institute, Bangalore 560080, India), BS(MIT Haystack Observatory, Westford, MA 01886, USA), BT(National Radio Astronomy Observatory, Green Bank, WV, USA), BU(Raman Research Institute, Bangalore 560080, India), BV(Raman Research Institute, Bangalore 560080, India), BW(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia; Raman Research Institute, Bangalore 560080, India), BX(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia; ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia), BY(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia), BZ(ARC Centre of Excellence for All-Sky Astrophysics (CAASTRO), Redfern, NSW 2016, Australia; School of Physics, The University of Melbourne, Parkville, VIC 3010, Australia), CA(MIT Haystack Observatory, Westford, MA 01886, USA), CB(International Centre for Radio Astronomy Research (ICRAR), Curtin University, Bentley, WA 6102, Australia), CC(Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA)
Publication:
Publications of the Astronomical Society of Australia, Volume 32, id.e025 12 pp. (PASA Homepage)
Publication Date:
06/2015
Origin:
CUP
Astronomy Keywords:
Galaxy: general, radio continuum: general, radio lines: general, surveys
Abstract Copyright:
2015: Astronomical Society of Australia
DOI:
10.1017/pasa.2015.26
Bibliographic Code:
2015PASA...32...25W

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 (delta + 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.
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