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Title:
Interplanetary Scintillation with the Murchison Widefield Array V: An all-sky survey of compact sources using a modern low-frequency radio telescope
Authors:
Morgan, J. S.; Macquart, J.-P.; Chhetri, R.; Ekers, R. D.; Tingay, S. J.; Sadler, E. M.
Affiliation:
AA(International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, WA 6845, Australia), AB(International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, WA 6845, Australia), AC(International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, WA 6845, Australia), AD(International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, WA 6845, Australia; CSIRO Astronomy and Space Science (CASS), P.O. Box 76, Epping, NSW 1710, Australia), AE(International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, WA 6845, Australia), AF(Sydney Institute for Astronomy, School of Physics A28, The University of Sydney, Sydney, NSW 2006, Australia)
Publication:
Publications of the Astronomical Society of Australia, Volume 36, id. e002 (PASA Homepage)
Publication Date:
01/2019
Origin:
CUP
Astronomy Keywords:
radio continuum: galaxies, scattering, sun: heliosphere, surveys, techniques: high angular resolution
Abstract Copyright:
2019: Astronomical Society of Australia
DOI:
10.1017/pasa.2018.40
Bibliographic Code:
2019PASA...36....2M

Abstract

We describe the parameters of a low-frequency all-sky survey of compact radio sources using Interplanetary Scintillation, undertaken with the Murchison Widefield Array. While this survey gives important complementary information to low-resolution survey, providing information on the sub-arsecond structure of every source, a survey of this kind has not been attempted in the era of low-frequency imaging arrays such as the Murchison Widefield Array and LOw Frequency Array. Here we set out the capabilities of such a survey, describing the limitations imposed by the heliocentric observing geometry and by the instrument itself. We demonstrate the potential for Interplanetary Scintillation measurements at any point on the celestial sphere and we show that at 160 MHz, reasonable results can be obtained within 30° of the ecliptic (2pi str: half the sky). We also suggest some observational strategies and describe the first such survey, the Murchison Widefield Array Phase I Interplanetary Scintillation survey. Finally we analyse the potential of the recently upgraded Murchison Widefield Array and discuss the potential of the Square Kilometre Array-low to use Interplanetary Scintillation to probe sub-mJy flux density levels at sub-arcsecond angular resolution.
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