Articles by Frits Sweijen

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Frits Sweijen

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A decade of sub-arcsecond imaging with the International LOFAR Telescope

10 February 2025 by Leah Morabito and others

Instrumentation and Methods for Astrophysics, Astrophysics of Galaxies

Unlocking ultra-deep wide-field imaging with sidereal visibility averaging

13 January 2025 by J. M. G. H. J. De Jong and others

Instrumentation and Methods for Astrophysics

The LOFAR Two-metre Sky Survey: Deep Fields Data Release 2. I. The ELAIS-N1 field

7 January 2025 by T. Shimwell and others

Cosmology and Nongalactic Astrophysics, High Energy Astrophysical Phenomena

Monster radio jet (>66 kpc) observed in quasar at z\sim5

25 November 2024 by Anniek Gloudemans and others

Astrophysics of Galaxies

A hidden Active Galactic Nuclei population: the first radio luminosity functions constructed by physical process

7 November 2024 by Leah Morabito and others

Astrophysics of Galaxies

1-arcsecond imaging of ELAIS-N1 field at 144MHz using the LoTSS survey with international LOFAR telescope

23 September 2024 by Haoyang Ye and others

Instrumentation and Methods for Astrophysics

Into the depths: Unveiling ELAIS-N1 with LOFAR's deepest sub-arcsecond wide-field images

18 July 2024 by J. M. G. H. J. De Jong and others

Instrumentation and Methods for Astrophysics, Cosmology and Nongalactic Astrophysics

The first high-redshift cavity power measurements of cool-core galaxy clusters with the International LOFAR Telescope

5 March 2024 by Roland Timmerman and others

Cosmology and Nongalactic Astrophysics

Nuclear regions as seen with LOFAR international baselines: A high-resolution study of the recurrent activity

20 November 2023 by Nika Jurlin and others

Astrophysics of Galaxies

VLBI Imaging of high-redshift galaxies and protoclusters at low radio frequencies with the International LOFAR Telescope

31 May 2023 by C. Cordun and others

Astrophysics of Galaxies

V-LoTSS: The Circularly-Polarised LOFAR Two-metre Sky Survey

19 December 2022 by Joseph Russell Callingham and others

Astrophysics of Galaxies, High Energy Astrophysical Phenomena

Identifying active galactic nuclei via brightness temperature with sub-arcsecond International LOFAR Telescope observations

26 July 2022 by Leah Morabito and others

Astrophysics of Galaxies

Measuring cavity powers of active galactic nuclei in clusters using a hybrid X-ray-radio method -- A new window on feedback opened by subarcsecond LOFAR-VLBI observations

11 July 2022 by Roland Timmerman and others

Cosmology and Nongalactic Astrophysics

The LOFAR Two-metre Sky Survey -- V. Second data release

23 February 2022 by T. Shimwell and others

Astrophysics of Galaxies, Cosmology and Nongalactic Astrophysics

Deep sub-arcsecond widefield imaging of the Lockman Hole field at 144 MHz

3 February 2022 by Frits Sweijen and others at

Leiden University

Instrumentation and Methods for Astrophysics, Astrophysics of Galaxies

Pushing subarcsecond resolution imaging down to 30 MHz with the trans-European International LOFAR Telescope

14 October 2021 by Christian Groeneveld and others

Astrophysics of Galaxies

Spectral analysis of spatially-resolved 3C295 (sub-arcsecond resolution) with the International LOFAR Telescope

16 August 2021 by Etienne Bonnassieux and others

Astrophysics of Galaxies

Unmasking the history of 3C 293 with LOFAR sub-arcsecond imaging

16 August 2021 by Pranav Kukreti and others

Astrophysics of Galaxies

High-resolution international LOFAR observations of 4C~43.15 -- Spectral ages and injection indices in a high-z radio galaxy

16 August 2021 by Frits Sweijen and others at

Sterrewacht Leiden

Astrophysics of Galaxies

The resolved jet of 3C 273 at 150 MHz

16 August 2021 by Jeremy Harwood and others

Astrophysics of Galaxies, High Energy Astrophysical Phenomena

Origin of the ring structures in Hercules A -- Sub-arcsecond 144 MHz to 7 GHz observations

16 August 2021 by Roland Timmerman and others

Astrophysics of Galaxies, Cosmology and Nongalactic Astrophysics

Sub-arcsecond imaging with the International LOFAR Telescope: II. Completion of the LOFAR Long-Baseline Calibrator Survey

16 August 2021 by Neal Jackson and others

Astrophysics of Galaxies, Instrumentation and Methods for Astrophysics

Sub-arcsecond imaging with the International LOFAR Telescope I. Foundational calibration strategy and pipeline

16 August 2021 by L. Morabito and others

Instrumentation and Methods for Astrophysics, Astrophysics of Galaxies

SHARP -- VI. Evidence for CO (1-0) molecular gas extended on kpc-scales in AGN star forming galaxies at high redshift

11 May 2020 by Cristiana Spingola and others

Astrophysics of Galaxies

Realising the LOFAR Two-Metre Sky Survey -- using the supercomputer JUWELS at the Forschungszentrum Jülich

11 November 2019 by Alexander Drabent and others

Instrumentation and Methods for Astrophysics

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Astrophysics of Galaxies Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena Solar and Stellar Astrophysics