AO
A. R. Offringa
astro-ph.IMastro-ph.COastro-ph.GAastro-ph.HEastro-ph.SRastro-ph.EPphysics.space-ph21-cm cosmologyCosmic dawncs.DB
On Valency
published · living versionsW_98jzgrvt·v1 · currentpublished
A search for long-timescale, low-frequency radio transients
with Tara Murphy, David L. Kaplan, Steve Croft, Christene Lynch +28
1 version
W_hfxes35b·v1published
Preprints & journals
145 papers in the corpus · 2009–2026Opportunity Lost in Searching for Technosignatures2610.05085v1 · Steve Prabu, David DeBoer, Andrew Siemion et al.2026 · 0 citationsarXiv
Foreground Characterization and Mitigation in the Observations of the CD/EoR with the SKA2607.01048v2 · Philip Bull, Jacob Burba, Emilio Ceccotti et al.2026 · 0 citationsarXiv
Lossless compression of simulated radio interferometric visibilities2512.23490v1 · A. R. Offringa, R. J. van Weeren2025 · 0 citationsarXiv
The impact of lunar topography on the 21-cm power spectrum for grid-based arrays : Insights for the Dark-ages EXplorer (DEX)2512.08906v1 · S. Ghosh, L. V. E. Koopmans, C. Brinkerink et al.2025 · 1 citationarXiv
Scalable and robust wide-field facet calibration with LOFAR's longest baselines2508.12115v1 · J.M.G.H.J. de Jong, L. Veefkind, R.J. van Weeren et al.2025 · 4 citationsarXiv
Mitigating incoherent excess variance in high-redshift 21 cm observations with multi-output cross-Gaussian process regression2508.08235v2 · S. Munshi, L. V. E. Koopmans, F. G. Mertens et al.2025 · 0 citationsA&A 704, A205 (2025)
Improved upper limits on the 21-cm signal power spectrum at and from an optimal field observed with NenuFAR2507.10533v2 · S. Munshi, F. G. Mertens, J. K. Chege et al.2025 · 13 citationsMon Not R Astron Soc (2025) 2785-2807
Constraints on the state of the IGM at using redshifted 21-cm observations with LOFAR2505.00373v1 · R. Ghara, S. Zaroubi, B. Ciardi et al.2025 · 15 citationsA&A 699, A109 (2025)
First upper limits on the 21-cm signal power spectrum of neutral hydrogen at from the LOFAR 3C196 field2504.18534v1 · E. Ceccotti, A. R. Offringa, F. G. Mertens et al.2025 · 9 citationsMon Not R Astron Soc (2025) 1255-1283
The impact of diffuse Galactic emission on direction-independent gain calibration in high-redshift 21 cm observations2504.03554v2 · C. Hofer, L.V.E. Koopmans, S.A. Brackenhoff et al.2025 · 3 citationsA&A 704, A117 (2025)
Robust direction-dependent gain-calibration of beam-modelling errors far from the target field2504.02483v2 · S.A. Brackenhoff, A.R. Offringa, M. Mevius et al.2025 · 6 citationsMon Not R Astron Soc (2025) 3993-4010
Near-field imaging of local interference in radio interferometric data: Impact on the redshifted 21 cm power spectrum2503.21728v2 · S. Munshi, F. G. Mertens, L. V. E. Koopmans et al.2025 · 9 citationsA&A 697, A203 (2025)
Square Kilometre Array Science Data Challenge 3a: foreground removal for an EoR experiment2503.11740v1 · A. Bonaldi, P. Hartley, R. Braun et al.2025 · 10 citationsarXiv
Deeper multi-redshift upper limits on the Epoch of Reionization 21-cm signal power spectrum from LOFAR between z=8.3 and z=10.12503.05576v2 · F. G. Mertens, M. Mevius, L. V. E. Koopmans et al.2025 · 38 citationsA&A 698, A186 (2025)
Spectral modelling of Cygnus A between 110 and 250 MHz. Impact on the LOFAR 21-cm signal power spectrum2502.18459v1 · E. Ceccotti, A. R. Offringa, L. V. E. Koopmans et al.2025 · 9 citationsA&A 696, A56 (2025)
Ionospheric contributions to the excess power in high-redshift 21-cm power-spectrum observations with LOFAR2407.20220v1 · S.A. Brackenhoff, M. Mevius, L.V.E. Koopmans et al.2024 · 10 citationsarXiv
Into the depths: Unveiling ELAIS-N1 with LOFAR's deepest sub-arcsecond wide-field images2407.13247v1 · J.M.G.H.J. de Jong, R.J. van Weeren, F. Sweijen et al.2024 · 19 citationsarXiv
The impact of lossy data compression on the power spectrum of the high redshift 21-cm signal with LOFAR2407.11557v1 · J. K. Chege, L.V.E. Koopmans, A. R. Offringa et al.2024 · 4 citationsA&A 692, A211 (2024)
Beyond the horizon: Quantifying the full sky foreground wedge in the cylindrical power spectrum2407.10686v2 · S. Munshi, F. G. Mertens, L. V. E. Koopmans et al.2024 · 16 citationsA&A 693, A276 (2025)
Constraints on the origin of the radio synchrotron background via angular correlations2311.17641v2 · Elisa Todarello, Marco Regis, Federico Bianchini et al.2023 · 6 citationsarXiv
First upper limits on the 21 cm signal power spectrum from cosmic dawn from one night of observations with NenuFAR2311.05364v2 · S. Munshi, F. G. Mertens, L. V. E. Koopmans et al.2023 · 65 citationsA&A 681, A62 (2024)
Transient RFI environment of LOFAR-LBA at 72-75 MHz: Impact on ultra-widefield AARTFAAC Cosmic Explorer observations of the redshifted 21-cm signal2311.03023v1 · B.K. Gehlot, L.V.E. Koopmans, S.A. Brackenhoff et al.2023 · 12 citationsA&A 681, A71 (2024)
A novel radio imaging method for physical spectral index modelling2308.07306v1 · E. Ceccotti, A. R. Offringa, L. V. E. Koopmans et al.2023 · 4 citationsarXiv
Apertif 1.4 GHz continuum observations of the Boötes field and their combined view with LOFAR2306.03710v1 · A. M. Kutkin, T. A. Oosterloo, R. Morganti et al.2023 · 6 citationsA&A 676, A37 (2023)
Diffuse Sources, Clustering and the Excess Anisotropy of the Radio Synchrotron Background2306.00829v1 · F. J. Cowie, A. R. Offringa, B. K. Gehlot et al.2023 · 7 citationsarXiv
RFI Flagging in Solar and Space Weather Low Frequency Radio Observations2302.05523v1 · Peijin Zhang, Andr'e R. Offringa, Pietro Zucca et al.2023 · 6 citationsarXiv
The LOFAR LBA Sky Survey II. First data release2301.12724v1 · F. de Gasperin, H. W. Edler, W. L. Williams et al.2023 · 42 citationsA&A 673, A165 (2023)
An interference detection strategy for Apertif based on AOFlagger 32301.01562v1 · A. R. Offringa, B. Adebahr, A. Kutkin et al.2023 · 7 citationsA&A 670, A166 (2023)
The Scintillating Tail of Comet C/2020 F3 (Neowise)2210.02139v1 · R.A. Fallows, B. Forte, M. Mevius et al.2022 · 1 citationA&A 667, A57 (2022)
Assessing the impact of two independent direction-dependent calibration algorithms on the LOFAR 21-cm signal power spectrum2209.07854v2 · H. Gan, F. G. Mertens, L. V. E. Koopmans et al.2022 · 24 citationsA&A 669, A20 (2023)
Continuum source catalog for the first APERTIF data release2208.05342v1 · A. M. Kutkin, T. A. Oosterloo, R. Morganti et al.2022 · 14 citationsA&A 667, A39 (2022)
First release of Apertif imaging survey data2208.05348v2 · Elizabeth A. K. Adams, B. Adebahr, W. J. G. de Blok et al.2022 · 43 citationsA&A 667, A38 (2022)
Statistical analysis of the causes of excess variance in the 21 cm signal power spectra obtained with the Low-Frequency Array2203.02345v1 · H. Gan, L.V.E Koopmans, F. G. Mertens et al.2022 · 21 citationsA&A 663, A9 (2022)
The LOFAR Two-metre Sky Survey -- V. Second data release2202.11733v1 · T. W. Shimwell, M. J. Hardcastle, C. Tasse et al.2022 · 493 citationsarXiv
Deep sub-arcsecond widefield imaging of the Lockman Hole field at 144 MHz2202.01608v1 · F. Sweijen, R. J. van Weeren, H. J. A. Rottgering et al.2022 · 45 citationsarXiv
Apercal -- The Apertif Calibration Pipeline2112.03722v1 · B. Adebahr, R. Schulz, T. J. Dijkema et al.2021 · 15 citationsAstronomy and Computing 38 (2022) 100514
Degree-Scale Galactic Radio Emission at 122 MHz around the North Celestial Pole with LOFAR-AARTFAAC2112.00721v3 · B. K. Gehlot, L. V. E. Koopmans, A. R. Offringa et al.2021 · 12 citationsA&A 662, A97 (2022)
Multi-scale feedback and feeding in the closest radio galaxy Centaurus A2111.02683v1 · B. McKinley, S. J. Tingay, M. Gaspari et al.2021 · 35 citationsarXiv
A numerical study of 21-cm signal suppression and noise increase in direction-dependent calibration of LOFAR data2111.02537v1 · M. Mevius, F. Mertens, L. V. E. Koopmans et al.2021 · 30 citationsMNRAS 2021
Measurement of the Anisotropy Power Spectrum of the Radio Synchrotron Background2110.00499v3 · A.R. Offringa, J. Singal, S. Heston et al.2021 · 15 citations2022, MNRAS, 509, 114
Apertif, Phased Array Feeds for the Westerbork Synthesis Radio Telescope2109.14234v2 · W. A. van Cappellen, T. A. Oosterloo, M. A. W. Verheijen et al.2021 · 143 citationsA&A 658, A146 (2022)
Pushing subarcsecond resolution imaging down to 30 MHz with the trans-European International LOFAR Telescope2108.07286v2 · C. Groeneveld, R. J. van Weeren, G. K. Miley et al.2021 · 15 citationsA&A 658, A9 (2022)
The GLEAM 200 MHz Local Radio Luminosity Function for AGN and Star-forming Galaxies2107.09030v1 · T. M. O. Franzen, N. Seymour, E. M. Sadler et al.2021 · 7 citationsarXiv
Peering into the dark (ages) with low-frequency space interferometers: Using the 21-cm signal of neutral hydrogen from the infant universe to probe fundamental (Astro)physics.34511720 · Koopmans, Léon V E, Barkana, Rennan, Bentum, Mark et al.2023 · 36 citationsExperimental astronomy. 2021;51(3):1641-1676
The AARTFAAC Cosmic Explorer: observations of the 21-cm power spectrum in the EDGES absorption trough2010.02269v1 · B. K. Gehlot, F. G. Mertens, L. V. E. Koopmans et al.2020 · 43 citationsarXiv
Extreme intra-hour variability of the radio source J1402+5347 discovered with Apertif2008.07945v1 · T.A. Oosterloo, H.K. Vedantham, A.M. Kutkin et al.2020 · 9 citationsarXiv
Reaching thermal noise at ultra-low radio frequencies: the Toothbrush radio relic downstream of the shock front2007.16043v2 · F. de Gasperin, G. Brunetti, M. Bruggen et al.2020 · 39 citationsA&A 642, A85 (2020)
Interpreting LOFAR 21-cm signal upper limits at z~9.1 in the context of high-z galaxy and reionisation observations2006.03203v1 · Bradley Greig, Andrei Mesinger, L'eon V. E. Koopmans et al.2020 · 77 citationsarXiv
The GLEAM 4-Jy (G4Jy) Sample: II. Host-galaxy identification for individual sources2004.13025v2 · Sarah V. White, Thomas M.O. Franzen, Chris J. Riseley et al.2020 · 27 citationsarXiv
Tight Constraints on the Excess Radio Background at from LOFAR2004.00678v2 · R. Mondal, A. Fialkov, C. Fling et al.2020 · 85 citationsMonthly Notices of the Royal Astronomical Society, Volume 498, Issue 3, November 2020, Pages 4178-4191
Career total: at least 314 works. 145 are in this corpus.Showing the 50 most recent.
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