Science with the Murchison Widefield Array: Phase I Results and Phase II Opportunities

Abstract

The Murchison Widefield Array (MWA) is an open access telescope dedicated to studying the low frequency (80$-$300 MHz) southern sky. Since beginning operations in mid 2013, the MWA has opened a new observational window in the southern hemisphere enabling many science areas. The driving science objectives of the original design were to observe 21\,cm radiation from the Epoch of Reionisation (EoR), explore the radio time domain, perform Galactic and extragalactic surveys, and monitor solar, heliospheric, and ionospheric phenomena. All together 60$+$ programs recorded 20,000 hours producing 146 papers to date. In 2016 the telescope underwent a major upgrade resulting in alternating compact and extended configurations. Other upgrades, including digital back-ends and a rapid-response triggering system, have been developed since the original array was commissioned. In this paper we review the major results from the prior operation of the MWA, and then discuss the new science paths enabled by the improved capabilities. We group these science opportunities by the four original science themes, but also include ideas for directions outside these categories.

arXiv comment38 pages, 12 figures, accepted for publication in PASA

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• In search of cool flow accretion onto galaxies $-$ where does the disk gas end?
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• Radio Emission in the Cosmic Web
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• Detection of polarized quasi-periodic microstructure emission in millisecond pulsars
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• Gas and dark matter in the Sculptor group: NGC 55
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• Observations of Low-Frequency Radio Emission from Millisecond Pulsars and Multipath Propagation in the Interstellar Medium
• NGC 741 - Mergers and AGN feedback on galaxy group scale
• Discovery of Carbon Radio Recombination Lines in M82
• Searching for Intergalactic Shocks with the SKA
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• The low-frequency characteristics of PSR J0437-4715 observed with the Murchison Widefield Array
• Quantifying weak non-thermal solar radio emission at low radio frequencies
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• A Census of Southern Pulsars at 185 MHz
• The Three Discrete Nulling Timescales of PSR J1717-4054
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• A Serendipitous MWA Search for Narrow-band and Broad-band Low Frequency Radio Transmissions from 1I/2017 U1 'Oumuamua
• Low Frequency Carbon Radio Recombination Lines II: The Diffuse Interstellar Medium
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• Multi-messenger astronomy of gravitational-wave sources with flexible wide-area radio transient surveys
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• The effect of photo-electric absorption on space-charge limited flow in pulsars
• Interplanetary Scintillation studies with the Murchison Wide-field Array III: Comparison of source counts and densities for radio sources and their sub-arcsecond components at 162 MHz
• Building models for extended radio sources: implications for Epoch of Reionisation science
• Interplanetary Scintillation studies with the Murchison Wide-field Array IV: The hosts of sub-arcsecond compact sources at low radio frequencies
• Hunting Gravitational Waves with Multi-Messenger Counterparts: Australia's Role
• A Molecular Line Survey around Orion at Low Frequencies with the MWA
• The Spitzer-South Pole Telescope Deep Field: Survey Design and IRAC Catalogs
• A novel approach for characterising broadband radio spectral energy distributions
• Low-Frequency Carbon Recombination Lines in the Orion Molecular Cloud Complex
• Detecting Magnetic Fields in Large-Scale Structure with Radio Polarization

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