WSClean: an implementation of a fast, generic wide-field imager for radio astronomy

Abstract

Astronomical widefield imaging of interferometric radio data is computationally expensive, especially for the large data volumes created by modern non-coplanar many-element arrays. We present a new widefield interferometric imager that uses the w-stacking algorithm and can make use of the w-snapshot algorithm. The performance dependencies of CASA's w-projection and our new imager are analysed and analytical functions are derived that describe the required computing cost for both imagers. On data from the Murchison Widefield Array, we find our new method to be an order of magnitude faster than w-projection, as well as being capable of full-sky imaging at full resolution and with correct polarisation correction. We predict the computing costs for several other arrays and estimate that our imager is a factor of 2-12 faster, depending on the array configuration. We estimate the computing cost for imaging the low-frequency Square-Kilometre Array observations to be 60 PetaFLOPS with current techniques. We find that combining w-stacking with the w-snapshot algorithm does not significantly improve computing requirements over pure w-stacking. The source code of our new imager is publicly released.

arXiv commentAccepted for publication in MNRAS

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• Detection and Characterisation of a Coronal Mass Ejection using Interplanetary Scintillation measurements from the Murchison Widefield Array
• Radio Burst from a Stellar Coronal Mass Ejection
• Transient RFI environment of LOFAR-LBA at 72-75 MHz: Impact on ultra-widefield AARTFAAC Cosmic Explorer observations of the redshifted 21-cm signal
• MeerKAT follow-up of enigmatic GLEAM 4-Jy (G4Jy) sources
• Degree-Scale Galactic Radio Emission at 122 MHz around the North Celestial Pole with LOFAR-AARTFAAC
• Very Large Array observations of the mini-halo and AGN feedback in the Phoenix cluster
• Search for low-frequency diffuse radio emission around a shock in the massive galaxy cluster MACS J0744.9+3927
• Diffusion of cosmic-ray electrons in M 51 observed with LOFAR at 54 MHz
• Non-thermal filaments and AGN recurrent activity in the galaxy group Nest200047: a LOFAR, uGMRT, MeerKAT, VLA radio spectral analysis
• Low-frequency radio observations of recurrent nova RS Ophiuchi with MeerKAT and LOFAR
• Magnetic fields in the outskirts of PSZ2 G096.88+24.18 from depolarization analysis of radio relics
• A Search for Technosignatures toward the Galactic Centre at 150 MHz
• Sensitivity of a Low-Frequency Polarimetric Radio Interferometer
• The LOFAR LBA Sky Survey: Deep Fields I. The Boötes Field
• Optimal gridding and degridding in radio interferometry imaging
• Contribution of Radio Halos to the Foreground for SKA EoR Experiments
• Radio-loud fraction of z>6 quasars
• LEAP: An Innovative Direction Dependent Ionospheric Calibration Scheme for Low Frequency Arrays
• Low(er) frequency follow-up of 28 candidate, large-scale synchrotron sources
• Improved upper limits on the 21-cm signal power spectrum at $z=17.0$ and $z=20.3$ from an optimal field observed with NenuFAR
• Long term radio monitoring of the neutron star X-ray binary Swift J1858.6-0814
• Limits and challenges of the detection of cluster-scale diffuse radio emission at high redshift: The Massive and Distant Clusters of WISE Survey (MaDCoWS) in LoTSS-DR2
• uGMRT detection of cluster radio emission in low-mass Planck~SZ clusters
• Mining Mini-Halos with MeerKAT I. Calibration and Imaging
• Cosmic dance in the Shapley Concentration Core II. The uGMRT-MeerKAT view of filaments in the brightest cluster galaxies and tailed radio galaxies in the A3528 cluster complex
• The detection of a massive chain of dark HI clouds in the GAMA G23 Field
• Tackling the Unique Challenges of Low-frequency Solar Polarimetry with the Square Kilometre Array Low Precursor: Pipeline Implementation
• Anomalous gas in ESO 149-G003: A MeerKAT-16 View
• Swarm intelligence for full Stokes dynamic imaging reconstruction of interferometric data
• Collimation of the kiloparsec-scale radio jets in NGC 2663
• MeerKAT-64 discovers wide-spread tidal debris in the nearby NGC 7232 galaxy group
• Searching for HI around MHONGOOSE Galaxies via Spectral Stacking
• MeerKAT's discovery of a radio relic in the bimodal merging cluster A2384
• Square Kilometre Array Science Data Challenge 3a: foreground removal for an EoR experiment
• Spectral modelling of Cygnus A between 110 and 250 MHz. Impact on the LOFAR 21-cm signal power spectrum
• Probing particle acceleration in Abell 2256: from to 16 MHz to gamma rays
• Connecting MeerKAT radio continuum properties to GAMA optical emission-line and WISE mid-infrared activity
• Challenging interferometric imaging: Machine learning-based source localization from uv-plane observations
• The self-confinement of electrons and positrons from dark matter
• Reaching thermal noise at ultra-low radio frequencies: the Toothbrush radio relic downstream of the shock front
• Ionospheric contributions to the excess power in high-redshift 21-cm power-spectrum observations with LOFAR
• VLBI Imaging of high-redshift galaxies and protoclusters at low radio frequencies with the International LOFAR Telescope
• Testing afterglow models of FRB 200428 with early post-burst observations of SGR 1935+2154
• Near-field imaging of local interference in radio interferometric data: Impact on the redshifted 21 cm power spectrum
• Characterization of the decametre sky at subarcminute resolution
• 3D Detection and Characterisation of ALMA Sources through Deep Learning
• Variability of X-ray polarization of Cyg X-1
• Parallel implementation of w-projection wide-field imaging
• MeerKAT radio observations of the neutron star low-mass X-ray binary Cen X-4 at low accretion rates
• A Low Frequency Pilot Survey of Southern HII Regions in the Vela Constellation
• Contemporaneous optical-radio observations of a fast radio burst in a close galaxy pair
• A new pulsar candidate in 47 Tucanae discovered with MeerKAT imaging
• New filamentary remnant radio emission and duty cycle constraints in the radio galaxy NGC 6086
• Weakly interacting massive particle cross section limits from LOFAR observations of dwarf spheroidal galaxies
• The extended HI halo of NGC 4945 as seen by MeerKAT
• The 2019 outburst of AMXP SAX J1808.4-3658 and radio follow up of MAXI J0911-655 and XTE J1701-462
• Contribution of Galactic free-free emission to the foreground for EoR signal in SKA experiments
• 1-arcsecond imaging of ELAIS-N1 field at 144MHz using the LoTSS survey with international LOFAR telescope
• Seeing the forest and the trees: a radio investigation of the ULIRG Mrk 273
• Short Timescale Evolution of the Polarized Radio Jet during V404 Cygni's 2015 Outburst
• Broadband Polarized Radio Emission Detected from Starlink Satellites Below 100 MHz with NenuFAR
• fast-resolve: Fast Bayesian Radio Interferometric Imaging
• Feedback in the merging galaxy group NGC6338
• CHANG-ES XXXIV: a 20 kpc radio bubble in the halo of the star-forming galaxy NGC 4217
• Searching for the largest bound atoms in space
• A high-resolution view of the jets in 3C 465
• Diffuse radio source candidate in CIZA J1358.9-4750
• VLBI observations of supernova PTF11qcj: Direct constraints on the size of the radio ejecta
• Constraining the 21cm brightness temperature of the IGM at $z$=6.6 around LAEs with the Murchison Widefield Array
• First upper limits on the 21-cm signal power spectrum of neutral hydrogen at $z=9.16$ from the LOFAR 3C196 field
• The MeerKAT Massive Distant Clusters Survey: detection of diffuse radio emission in galaxy clusters at $z>1$
• The MeerKAT Massive Distant Clusters Survey: A Radio Halo in a Massive Galaxy Cluster at z = 1.23
• The interstellar medium in the environment of the supernova-less long-duration GRB 111005A
• Accuracy vs. Complexity: Calibrating radio interferometer arrays with non-homogeneous element patterns
• Broadband Imaging to Study the Spectral Distribution of Meteor Radio Afterglows
• AGN feedback in an infant galaxy cluster: the LOFAR-Chandra view of the giant FRII radio galaxy J103025+052430 at z=1.7
• G0.173-0.42: an X-ray and radio magnetized filament near the galactic center
• No strong radio absorption detected in the low-frequency spectra of radio-loud quasars at z > 5.6
• Diffuse Sources, Clustering and the Excess Anisotropy of the Radio Synchrotron Background
• A spatially resolved radio spectral study of the galaxy M 51
• Monster radio jet (>66 kpc) observed in quasar at z$\sim$5
• PolyCLEAN: Atomic Optimization for Super-Resolution Imaging and Uncertainty Estimation in Radio Interferometry
• Searching for low radio-frequency gravitational wave counterparts in wide-field LOFAR data
• SYMBA: An end-to-end VLBI synthetic data generation pipeline
• Resolving spatial and temporal shock structures using LOFAR observations of type II radio bursts
• A Molecular Line Survey around Orion at Low Frequencies with the MWA
• High-$z$ radio Quasars in RACS I: Selection, identification, and multi-wavelength properties
• Deep learning-based deconvolution for interferometric radio transient reconstruction
• Apertif 1.4 GHz continuum observations of the Boötes field and their combined view with LOFAR
• The significance of low frequency interferometric observations for the GPS pulsar flux estimation: the case of J1740+1000
• A Comparative Analysis To Deal With Missing Spectral Information Caused By RFI In Cosmological HI 21CM Observations
• SuperCLASS -- I. The Super CLuster Assisted Shear Survey: Project overview and Data Release 1
• High time resolution search for prompt radio emission from the long GRB 210419A with the Murchison Widefield Array
• Interferometric imaging of the type IIIb and U radio bursts observed with LOFAR on 22 August 2017
• Characterising the Apertif primary beam response
• Deep network series for large-scale high-dynamic range imaging
• Detection of coherent low-frequency radio bursts from weak-line TTauri stars
• CHANG-ES: XXXVI. The thin and thick radio discs
• Spherical Panoramas for Astrophysical Data Visualization
• Searching for the Synchrotron Cosmic Web Again: A replication attempt
• System equivalent flux density of a low-frequency polarimetric phased array interferometer
• Spectral study of the diffuse synchrotron source in the galaxy cluster Abell 523
• Approximating W projection as a separable kernel
• MeerKAT radio detection of the Galactic black hole candidate Swift J1842.5-1124 during its 2020 outburst
• Spectroscopic Imaging of the Sun with MeerKAT: Opening a New Frontier in Solar Physics
• Revisiting the Giant Radio Galaxy ESO 422-G028: Part I. Discovery of a neutral inflow and recent star formation in a restarted giant
• Abell 0399-Abell 0401 radio bridge spectral index: the first multifrequency detection
• The Black Hole Candidate Swift J1728.9$-$3613 and the Supernova Remnant G351.9$-$0.9
• Sloshing and spiral structures breeding a putative radio mini-halo in the environment of a cool-core cluster Abell 795
• How to make CLEAN variants faster? Using clustered components informed by the autocorrelation function
• Evidence of mutually exclusive outflow forms from a black hole X-ray binary
• A 100 kpc Ram Pressure Tail Trailing the Group Galaxy NGC 2276
• Polarized multiwavelength emission from pulsar wind - accretion disk interaction in a transitional millisecond pulsar
• What drives the wheels of evolution in NGC 1512? A UVIT study
• A Spectropolarimetric Study of Pictor A Radio Galaxy with MeerKAT
• First Robust Detection of Linear Polarization from Metric Solar Emissions: Challenging Established Paradigms
• Strong low-frequency radio flaring from Cygnus X-3 observed with LOFAR
• Synchrotron emission from double-peaked radio light curves of the symbiotic recurrent nova V3890 Sagitarii
• A MeerKAT view on galaxy clusters: a radio-optical study of Abell 1300 and MACS J1931.8--2634
• A novel radio imaging method for physical spectral index modelling
• A LOFAR prompt search for radio emission accompanying X-ray flares in GRB 210112A
• The impact of lossy data compression on the power spectrum of the high redshift 21-cm signal with LOFAR
• Robust direction-dependent gain-calibration of beam-modelling errors far from the target field
• Neutral hydrogen lensing simulations in the Hubble Frontier Fields
• Revealing the intricacies of radio galaxies and filaments in the merging galaxy cluster Abell 2255. I. Insights from deep LOFAR-VLBI sub-arcsecond resolution images
• Interferometric imaging, and beam-formed study of a moving Type IV Radio burst with LOFAR
• Supernova remnant candidates identified using MWA Galactic Plane Monitoring over 285deg < l < 70deg and |b| < 16deg
• Determining the acceleration regions of in situ electrons using remote radio and X-ray observations
• Constraints on the magnetic field in the inter-cluster bridge A399-A401
• Large-scale radio bubbles around the black hole transient V4641 Sgr
• Constraining the magnetic field in the galaxy cluster Abell 2142 using MeerKAT L-band polarisation data
• Application of Physics-Informed Neural Networks in Removing Telescope Beam Effects
• Coronal Diagnostics of Solar Type-III Radio Bursts Using LOFAR and PSP Observations
• Multi-Step Reconstruction of Radio-Interferometric Images
• From 100 MHz to 10 GHz: Unveiling the spectral evolution of the X-shaped radio galaxy in Abell 3670
• Synthetic Observations with the Square Kilometre Array (SKA) -- development towards an end-to-end pipeline
• The radio source in Abell 980: A Detached-Double-Double Radio Galaxy?
• Radio emission from a massive node of the cosmic web. A discovery powered by machine learning
• HI in and behind the Hubble Frontier Field Clusters: A Deep MeerKAT Pilot Search out to $z\sim 0.5$
• A circularly polarized low-frequency radio burst from the exoplanetary system HD 189733
• Extreme AGN feedback in the fossil galaxy group SDSSTG 4436
• CHEX-MATE: New detections and properties of the radio diffuse emission in massive clusters with MeerKAT
• Einstein Probe discovery of the short period intermediate polar EP J115415.8-501810
• The Accretion-Ejection Connection in the Black Hole X-ray Binary MAXI J1820$+$070
• Characterization of the AARTFAAC-12 aperture array: radio source counts at 42 and 61 MHz
• Periodic Radio and X-ray Emission from an Accreting White Dwarf Binary
• The structure of the giant radio fossil in the Ophiuchus galaxy cluster
• A neutral hydrogen absorption study of cold gas in the outskirts of the Magellanic Clouds using the GASKAP-HI survey
• Imaging and spectropolarimetric observations of a band-split type II solar radio burst with LOFAR
• Non-thermal emission in galaxy groups at extremely low frequency: the case of A1213
• WS-Snapshot: An effective algorithm for wide-field and large-scale imaging
• Image plane detection of FRB121102 with the MeerKAT radio telescope
• Sub-kilometre scale ionospheric studies at the SKA-Low site, using MWA extended baselines
• The first high-redshift cavity power measurements of cool-core galaxy clusters with the International LOFAR Telescope
• Solar Observation with MeerKAT: Demonstration of Technical Readiness and Initial Science Highlight
• Spectral features and variable circular polarisation in the radio emission from the pre-cataclysmic variable QS Vir
• Mapping Diffuse Radio Sources Using TUNA: A Transformer-Based Deep Learning Approach
• Scalability Model for the LOFAR Direction Independent Pipeline
• Source location and evolution of a multi-lane type II radio burst
• Single-pulse analysis and average emission characteristics of PSR J1820-0427 from observations made with the MWA and uGMRT
• Optimising the Processing and Storage of Visibilities using lossy compression
• The Hawaii SCUBA-2 Lensing Cluster Survey: Radio-detected Submillimeter Galaxies in the HST Frontier Fields
• Somewhere in between: Tracing the Radio Emission from Galaxy Groups (or Why Does the Future of Observing Galaxy Groups with Radio Telescopes Look Promising?)
• An Extragalactic Widefield Search for Technosignatures with the Murchison Widefield Array
• MeerKAT discovery of GHz radio emission extending from Abell 3017 toward Abell 3016
• A 15 Mpc rotating galaxy filament at redshift z = 0.032
• A Matched Survey for the Enigmatic Low Radio Frequency Transient ILT J225347+862146
• Imaging swiFTly: streaming widefield Fourier Transforms for large-scale interferometry
• Investigating four new candidate redback pulsars discovered in the image plane
• TABASCAL: Removing multi-satellite interference from radio interferometry observations
• MeerKAT view of Hickson Compact Groups:I. Data description and release
• Convolutional Deep Denoising Autoencoders for Radio Astronomical Images
• Detailed study of the Bootes field using 300-500 MHz uGMRT observations: Source Properties and radio--infrared correlations
• LOFAR non-detections of SN 2023ixf in its first year post-explosion
• COBRaS: The e-MERLIN 21 cm Legacy survey of Cygnus OB2
• Toward a Robust R2D2 Paradigm for Radio-interferometric Imaging: Revisiting Deep Neural Network Training and Architecture
• Relighting the fire in Hickson Compact Group (HCG) 15: magnetised fossil plasma revealed by the SKA Pathfinders & Precursors
• MOSS I: Double radio relics in the Saraswati supercluster
• Multiwavelength identification of millisecond pulsar candidates in the Galactic bulge
• Processing of GASKAP-HI pilot survey data using a commercial supercomputer
• Accelerating the CLEAN algorithm of radio interferometry with convex optimization
• uGMRT and MeerKAT observation of RXCJ0232-4420: a quiet cluster with a giant radio halo
• Efficiency Near the Edge: Increasing the Energy Efficiency of FFTs on GPUs for Real-time Edge Computing
• The LOFAR sub-arcsecond view of the high-redshift radio relic in PSZ2G091.83+26.11
• Fast and Reproducible LOFAR Workflows with AGLOW
• The MeerKAT Fornax Survey -- I. Survey description and first evidence of ram pressure in the Fornax galaxy cluster
• A persistent bow shock in a diskless magnetised accreting white dwarf
• Combined LOFAR-uGMRT analysis of the diffuse radio emission in the massive clusters Abell 773 and Abell 1351
• The impact of lunar topography on the 21-cm power spectrum for grid-based arrays : Insights for the Dark-ages EXplorer (DEX)
• The LeMMINGs survey: probing sub-kpc radio structures of nearby galaxies with e-MERLIN
• CHILLING: Continuum Halos in LVHIS Local Irregular Nearby Galaxies - Radio continuum spectral behavior of dwarf galaxies
• Resurging from the ashes: A spectral study of seven candidate revived radio fossils in nearby low-mass galaxy clusters
• LOFAR 58 MHz Legacy Survey of the 3CRR Catalog
• Enhanced radio emission between a galaxy cluster pair
• The Crab Nebula at subarcsecond resolution with the International LOFAR Telescope
• BLINK: an End-To-End GPU High Time Resolution Imaging Pipeline for Fast Radio Burst Searches with the Murchison Widefield Array
• Pilot study and early results of the Cosmic Filaments and Magnetism Survey with Nenufar: the Coma cluster field
• A MeerKAT survey of nearby dwarf novae: I. New detections
• MeerKAT 21-cm HI imaging of Abell 2626 and beyond
• A Decentralized Framework for Radio-interferometric Image Reconstruction
• The radio afterglow of the ultra-long GRB 220627A
• A deep study of A399-401: An application for wide-field facet calibration
• Fast algorithms to approximate the position-dependent point spread function responses in radio interferometric wide-field imaging
• The Multi-Epoch Jet Outbursts in Abell 496: synchrotron ageing and buoyant X-ray cavities draped by warm gas filaments
• Broadband Modelling of GRB 230812B Afterglow: Implications for VHE $\gamma$-ray Detection with IACTs
• MeerKAT observations of the spiral galaxy NGC 2997 in the S band. Detection of high dynamo modes
• The MeerKAT Massive Distant Clusters Survey: a search for diffuse radio emission in 30 massive SZ-selected clusters at $z>1$
• On The Nature of Einstein Probe Transient EP250916a: Insights from X-ray, Optical, and Radio Observations
• Kiloparsec-scale imaging of the CO(1-0)-traced cold molecular gas reservoir in a z~3.4 submillimeter galaxy
• Direct Wide-Field Radio Imaging in Real-Time at High Time Resolution using Antenna Electric Fields
• Revealing the intricacies of radio galaxies and filaments in the merging galaxy cluster Abell 2255. II. Properties of filaments using multi-frequency radio data
• Jet-Cocoon Geometry in the Optically Dark, Very High Energy Gamma-ray Burst 201216C
• Evidence of sloshing-driven mini-halo formation in the cool-core cluster RXCJ1558.3-1410
• Lossless compression of simulated radio interferometric visibilities
• Foreground Subtraction with a Tensor-Based Oriented Singular Value Decomposition Method for HI Experiments
• Cosmic-ray electron propagation in NGC 3044 from radio continuum observations
• First detection of variable radio emission originating from the infant planetary system V1298 Tau
• MEDUSA I. Tracing magnetic field structures in tidal arms of the dwarf-dwarf merger NGC 1487
• A LOFAR-uGMRT spectral index study of distant radio halos
• MIGHTEE: total intensity radio continuum imaging and the COSMOS / XMM-LSS Early Science fields
• HI gas in the rejuvenated radio galaxy PKS 2014-55
• Supermassive Black Hole Winds in X-rays: SUBWAYS IV. Tracing Radio Emission and Unveiling the Role of Winds
• High-Performance Gridding For Radio Interferometric Image Synthesis
• A high-resolution study of the double radio relic system in MACS J1752.0+4440
• It's Always Darkest Before the Cosmic Dawn: Early Results from Novel Tools and Telescopes for 21 cm Cosmology
• Adaptive Uniform Weighting: Pre-conditioning to Improve Image Fidelity
• Implementation of 3D degridding algorithm on the NVIDIA GPUs using CUDA
• Variability of Sagittarius A* at 3 GHz on minute-scale with MeerKAT
• MeerKAT observations of Procyon at 815.5 MHz
• Finding the evolutionary link between ULIRGs and radio galaxies
• Multi-wavelength insights into the pulsar wind nebula candidate near 1LHAASO J0343+5254u: an obscured merging galaxy cluster?
• Mitigating gain calibration errors from EoR observations with SKA1-Low AA*
• BIPP: An efficient HPC implementation of the Bluebild algorithm for radio astronomy
• Deep polarimetry study reveals double ring ORC-like structures
• A Monte Carlo Implementation of Galactic Free-Free Emission for the EoR Foreground Models
• A Study on Non-coplanar Baseline Effects for Mingantu Spectral Radioheliograph
• Wide-field GMRT imaging of X-shaped Radio-Galaxies: Spectral properties of 4C32.25 and 4C61.23
• Radio Burst and Circular Polarization Studies of the Solar Corona at Low Frequencies
• Spectral analysis of spatially-resolved 3C295 (sub-arcsecond resolution) with the International LOFAR Telescope
• A VLITE Search for Millisecond Pulsars in Globular Clusters: Discovery of a Pulsar in GLIMPSE-C01
• The resolved jet of 3C 273 at 150 MHz