252 citations · 998 across the 34 of their papers we have counts for
35 papers
Correcting Bandwidth Depolarization by Extreme Faraday Rotation
Maxwell A. Fine, Cameron L. Van Eck, Luke Pratley
Measurements of the polarization of radio emission are subject to a number of depolarization effects such as bandwidth depolarization, which is caused by the averaging effect of a…
The Global Magneto-Ionic Medium Survey (GMIMS): The brightest polarized region in the Southern sky at 75cm and its implications for Radio Loop II
Alec J. M. Thomson, T. L. Landecker, N. M. McClure-Griffiths +16
Using the Global Magneto-Ionic Medium Survey (GMIMS) Low-Band South (LBS) southern sky polarization survey, covering 300 to 480 MHz at 81 arcmin resolution, we reveal the brightest…
Sparse image reconstruction on the sphere: a general approach with uncertainty quantification
Matthew A. Price, Luke Pratley, Jason D. McEwen
Inverse problems defined naturally on the sphere are becoming increasingly of interest. In this article we provide a general framework for evaluation of inverse problems on the sph…
Removing non-physical structure in fitted Faraday rotated signals: non-parametric QU-fitting
Luke Pratley, Melanie Johnston-Hollitt, Bryan M. Gaensler
Next-generation spectro-polarimetric broadband surveys will probe cosmic magnetic fields in unprecedented detail, using the magneto-optical effect known as Faraday rotation. Howeve…
Novel perspectives gained from new reconstruction algorithms
Luke Pratley, Melanie Johnston-Hollitt, Jason D. McEwen
Since the 1970s, much of traditional interferometric imaging has been built around variations of the CLEAN algorithm, in both terminology, methodology, and algorithm development. R…
Magnetism Science with the Square Kilometre Array
George Heald, Sui Ann Mao, Valentina Vacca +41
The Square Kilometre Array (SKA) will answer fundamental questions about the origin, evolution, properties, and influence of magnetic fields throughout the Universe. Magnetic field…
Offline and online reconstruction for radio interferometric imaging
Xiaohao Cai, Luke Pratley, Jason D. McEwen
Radio astronomy is transitioning to a big-data era due to the emerging generation of radio interferometric (RI) telescopes, such as the Square Kilometre Array (SKA), which will acq…
Spherical Bayesian mass-mapping with uncertainties: full sky observations on the celestial sphere
Matthew A. Price, Jason D. McEwen, L. Pratley +1
To date weak gravitational lensing surveys have typically been restricted to small fields of view, such that the has been sufficiently satisfied.…
Wide-band Rotation Measure Synthesis
Luke Pratley, Melanie Johnston-Hollitt
Rotation measure synthesis allows the estimation of Faraday dispersion via a Fourier transform and is the primary tool to probe cosmic magnetic fields. We show this can be consider…
Load balancing for distributed interferometric image reconstruction
Luke Pratley, Jason D. McEwen
We present a new algorithm to perform wide-field radio interferometric image reconstruction, with exact non-coplanar correction, that scales to big-data. This algorithm allows us t…
-stacking -projection hybrid algorithm for wide-field interferometric imaging: implementation details and improvements
L. Pratley, M. Johnston-Hollitt, J. D. McEwen
We present a detailed discussion of the implementation strategies for a recently developed -stacking -projection hybrid algorithm used to reconstruct wide-field interferometr…
Sparse Image Reconstruction for the SPIDER Optical Interferometric Telescope
Luke Pratley, Jason D. McEwen
The concept of a recently proposed small-scale interferometric optical imaging device, an instrument known as the Segmented Planar Imaging Detector for Electro-optical Reconnaissan…
Distributed and parallel sparse convex optimization for radio interferometry with PURIFY
Luke Pratley, Jason D. McEwen, Mayeul d'Avezac +4
Next generation radio interferometric telescopes are entering an era of big data with extremely large data sets. While these telescopes can observe the sky in higher sensitivity an…
Approximate T-matrix and optical properties of spheroidal particles to third order in size parameter
Matt R. A. Majic, Luke Pratley, Dmitri Schebarchov +3
We here calculate the series expansion of the T-matrix for a spheroidal particle in the small-size/long-wavelength limit, up to third lowest order with respect to the size paramete…
A fast and exact -stacking and -projection hybrid algorithm for wide-field interferometric imaging
Luke Pratley, Melanie Johnston-Hollitt, Jason D. McEwen
The standard wide-field imaging technique, the -projection, allows correction for wide-fields of view for non-coplanar radio interferometric arrays. However, calculating exact c…
Online radio interferometric imaging: assimilating and discarding visibilities on arrival
Xiaohao Cai, Luke Pratley, Jason D. McEwen
The emerging generation of radio interferometric (RI) telescopes, such as the Square Kilometre Array (SKA), will acquire massive volumes of data and transition radio astronomy to a…
Upper limits on a radio halo in Abell 3667 at 1.4 GHz
M. Johnston-Hollitt, L. Pratley
The presence of a radio halo in the massive, merging cluster Abell 3667 has recently become a focus of debate in the literature following a putative halo detection at 2.4 GHz despi…
LOFAR MSSS: The Scaling Relation between AGN Cavity Power and Radio Luminosity at Low Radio Frequencies
G. Kokotanekov, M. Wise, G. H. Heald +35
We present a new analysis of the widely used relation between cavity power and radio luminosity in clusters of galaxies with evidence for strong AGN feedback. We study the correlat…
PURIFYing real radio interferometric observations
Luke Pratley, Jason D. McEwen, Mayeul d'Avezac +3
Next-generation radio interferometers, such as the Square Kilometre Array (SKA), will revolutionise our understanding of the universe through their unprecedented sensitivity and re…
LOFAR MSSS: Discovery of a 2.56 Mpc giant radio galaxy associated with a disturbed galaxy group
A. O. Clarke, G. Heald, T. Jarrett +40
We report on the discovery in the LOFAR Multifrequency Snapshot Sky Survey (MSSS) of a giant radio galaxy (GRG) with a projected size of Mpc projected on the sky. I…
The w-effect in interferometric imaging: from a fast sparse measurement operator to super-resolution
Arwa Dabbech, Laura Wolz, Luke Pratley +2
Modern radio telescopes, such as the Square Kilometre Array (SKA), will probe the radio sky over large fields-of-view, which results in large w-modulations of the sky image. This e…
Robust sparse image reconstruction of radio interferometric observations with purify
Luke Pratley, Jason D. McEwen, Mayeul d'Avezac +3
Next-generation radio interferometers, such as the Square Kilometre Array (SKA), will revolutionise our understanding of the universe through their unprecedented sensitivity and re…
ATCA observations of the MACS-Planck Radio Halo Cluster Project - I. New detection of a radio halo in PLCK G285.0-23.7
Gerardo Martinez Aviles, Chiara Ferrari, Melanie Johnston-Hollitt +12
We investigate the possible presence of diffuse radio emission in the intermediate redshift, massive cluster PLCK G285.0-23.7 (z=0.39, M_500 = 8.39 x 10^(14) M_Sun). Our 16cm-band…
An improved method for polarimetric image restoration in interferometry
Luke Pratley, Melanie Johnston-Hollitt
Interferometric radio astronomy data require the effects of limited coverage in the Fourier plane to be accounted for via a deconvolution process. For the last 40 years this proces…