252 citations · 998 across the 34 of their papers we have counts for
17 papers · 1 filter
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…
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…
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…
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…
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…
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…
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…
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…
The LOFAR Multifrequency Snapshot Sky Survey (MSSS) I. Survey description and first results
G. H. Heald, R. F. Pizzo, E. Orrú +147
We present the Multifrequency Snapshot Sky Survey (MSSS), the first northern-sky LOFAR imaging survey. In this introductory paper, we first describe in detail the motivation and de…
Estimating extragalactic Faraday rotation
Niels Oppermann, Henrik Junklewitz, Maksim Greiner +11
(abridged) Observations of Faraday rotation for extragalactic sources probe magnetic fields both inside and outside the Milky Way. Building on our earlier estimate of the Galactic…