The Murchison Widefield Array: The Square Kilometre Array Precursor at Low Radio Frequencies

Tingay, S. J.; Goeke, R.; Bowman, Judd D.; Emrich, D.; Ord, S. M.; Mitchell, D. A.; Morales, M. F.; Booler, T.; Crosse, B.; Wayth, R. B.; Lonsdale, Colin J.; Tremblay, S. E.; Pallot, D.; Colegate, T.; Wicenec, A.; Kudryavtseva, N. A.; Arcus, W.; Barnes, David G.; Bernardi, G.; Briggs, F.; Burns, S.; Bunton, John D.; Cappallo, R. J.; Corey, B. E.; Deshpande, A. A.; deSouza, L.; Gaensler, B. M.; Greenhill, L. J.; Hall, Peter; Hazelton, B. J.; Herne, D.; Hewitt, Jacqueline N.; Johnston‐Hollitt, M.; Kaplan, D. L.; Kasper, J. C.; Kincaid, B. B.; Koenig, R.; Kratzenberg, E.; Lynch, M. J.; McKinley, B.; McWhirter, S. R.; Morgan, E.; Oberoi, D.; Pathikulangara, J.; Prabu, T.; Remillard, Ron; Rogers, A. E. E.; Roshi, A.; Salah, J. E.; Sault, R. J.; Udaya-Shankar, N.; Schlagenhaufer, F.; Srivani, K. S.; Stevens, J.; Subrahmanyan, R.; Waterson, M.; Webster, R. L.; Whitney, A. R.; Williams, A.; Williams, Christopher; Wyithe, J. Stuart B.

doi:10.1017/pasa.2012.007

Cited by 1,102 publications

(637 citation statements)

References 38 publications

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“…NCRA is also exploring other possible options for Indian participation in the construction phase, that is expected to commence from 2018. Furthermore, there is Indian participation (via the Raman Research Institute, Bengaluru) in the SKA precursor project called the Murchinson Widefield Array (MWA) 8 . Many of the above activities have direct synergy with upgrade work ongoing at existing Indian facilities like the GMRT 9,10 , which has recently been accorded the status of a SKA Pathfinder telescope, in recognition of the fact that important technical and scientific developments are being carried out at the GMRT which will provide valuable feedback to the teams designing the SKA facility.…”

Section: Participation In Technical Activitiesmentioning

confidence: 99%

India and the Square Kilometre Array

Diamond

Gupta

2017

Current Science

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The Square Kilometre Array (SKA), the world's nextgeneration radio telescope, is being designed by an international consortium. It will, once complete, deliver capability for a broader range of science than any other facility. Indian scientists and engineers have played a critical role in the definition of the SKA concept and its science case, in the design of the instrument and, hopefully, will do so in the construction and operation. This article describes the current status of the global project with a focus on India's role in the global collaboration.

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Section: Participation In Technical Activitiesmentioning

confidence: 99%

India and the Square Kilometre Array

Diamond

Gupta

2017

Current Science

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“…Similarly, ν u and ν v are the components of a baseline, measured in wavelength. The position difference between stations p and q isr p,q , and its projection onto the visibility plane is called a baseline, determined [16]. In this work, only core and remote stations are considered in the simulations without loss of generality.…”

Section: Reconstruction Theory and Configuration Of Stationsmentioning

confidence: 99%

“…In the MWA, 50 tiles are uniformly distributed in the core area with 100 m in diameter, surrounded by 62 tiles distributed over an area with 1.5 km in diameter [16]. Another 16 tiles are placed as far as 3 km off the center to achieve the highest angular resolution of images [16].…”

Section: Brief Review Of Other Next-generation Telescopesmentioning

confidence: 99%

“…Another 16 tiles are placed as far as 3 km off the center to achieve the highest angular resolution of images [16].…”

Section: Brief Review Of Other Next-generation Telescopesmentioning

confidence: 99%

“…Next-generation radio telescopes, such as Square Kilometre Array Pathfinder (ASKAP) [15], Murchinson Widefield Array (MWA) [16], Meerkat [17], Square kilometre Array (SKA) [18,19], and Low-Frequency Array (LOFAR) [20], are expected to achieve a wider dynamic range and higher angular resolution than current instruments.…”

Section: Introductionmentioning

confidence: 99%

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A Multi-Feature Visibility Processing Algorithm for Radio Interferometric Imaging on Next-Generation Telescopes

Chiou¹,

Kiang²,

Mittra³

2014

PIER C

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Abstract-The visibility distribution, which is related to the configuration of stations, can be categorized into different features, each having different levels of data number density. A computationally efficient multi-feature image reconstruction algorithm, well adapted for next-generation telescopes, is proposed based on this observation, which is more flexible to handle massive amount of visibility data expected in the future. In reconstructing the M87 image with the visibility data simulated on the Low-Frequency Array (LOFAR), this algorithm turns out to be a few hundreds to one thousand times faster and is more resilient to noises than the conventional algorithms.

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Understanding instrumental Stokes leakage in Murchison Widefield Array polarimetry

et al. 2015

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This paper offers an electromagnetic, more specifically array theory, perspective on understanding strong instrumental polarization effects for planar low-frequency "aperture arrays" with the Murchison Widefield Array (MWA) as an example. A long-standing issue that has been seen here is significant instrumental Stokes leakage after calibration, particularly in Stokes Q at high frequencies. A simple model that accounts for interelement mutual coupling is presented which explains the prominence of Q leakage seen when the array is scanned away from zenith in the principal planes. On these planes, the model predicts current imbalance in the X (E-W) and Y (N-S) dipoles and hence the Q leakage. Although helpful in concept, we find that this model is inadequate to explain the full details of the observation data. This finding motivates further experimentation with more rigorous models that account for both mutual coupling and embedded element patterns. Two more rigorous models are discussed: the "full" and "average" embedded element patterns. The viability of the full model is demonstrated by simulating current MWA practice of using a Hertzian dipole model as a Jones matrix estimate. We find that these results replicate the observed Q leakage to approximately 2 to 5%. Finally, we offer more direct indication for the level of improvement expected from upgrading the Jones matrix estimate with more rigorous models. Using the average embedded pattern as an estimate for the full model, we find that Q leakage of a few percent is achievable.

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The Murchison Widefield Array: The Square Kilometre Array Precursor at Low Radio Frequencies

Cited by 1,102 publications

References 38 publications

India and the Square Kilometre Array

India and the Square Kilometre Array

A Multi-Feature Visibility Processing Algorithm for Radio Interferometric Imaging on Next-Generation Telescopes

Understanding instrumental Stokes leakage in Murchison Widefield Array polarimetry

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