Publications

André Offringa — Astronomy, C++ and Related Interests

This site gathers the research work, publications and notes of André Offringa, whose interests span radio astronomy, interferometric imaging, C++ software development and related technical topics. Use the navigation below to explore the site.

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First-Author Publications

Peer-reviewed papers and conference proceedings where A.R. Offringa is the lead author, covering interferometric gridding, RFI excision, wideband deconvolution, data compression and low-frequency radio observations.

• Precision requirements for interferometric gridding in 21-cm power spectrum analysis — A.R. Offringa et al., 2019, A&A, 631, A12.
• The impact of interference excision on 21-cm Epoch of Reionization power spectrum analyses — A.R. Offringa et al., 2019, MNRAS, 484, 2.
• An optimized algorithm for multi-scale wideband deconvolution of radio astronomical images — A.R. Offringa & O. Smirnov, 2017, MNRAS, 471, 1.
• Compression of interferometric radio-astronomical data — A.R. Offringa, 2016, A&A, 595, A99.
• Parametrising Epoch of Reionization foregrounds: A deep survey of low-frequency point-source spectra with the MWA — A.R. Offringa et al., Jan 2016, MNRAS, 458, 1, pp. 1057–1070.
• The low-frequency environment of the Murchison Widefield Array: radio-frequency interference analysis and mitigation — A.R. Offringa et al., Jan 2015, PASA, 32, e008.
• WSClean: an implementation of a fast, generic wide-field imager for radio astronomy — A.R. Offringa et al., Oct 2014, MNRAS, 444, 1, pp. 606–619.
• The brightness and spatial distributions of terrestrial radio sources — A.R. Offringa et al., Oct 2013, MNRAS, 435, 1, pp. 584–596.
• The LOFAR radio environment — A.R. Offringa et al., Jan 2013, A&A, 549, A1.
• Algorithms for Radio Interference Detection and Removal — A.R. Offringa, Jun 2012, University of Groningen, dissertation.
• Post-correlation filtering techniques for off-axis source and RFI removal — A.R. Offringa, A.G. de Bruyn and S. Zaroubi, May 2012, MNRAS, 422, 1, pp. 563–580.
• A morphological algorithm for improving radio-frequency interference detection — A.R. Offringa, J.J. van de Gronde and J.B.T.M. Roerdink, Mar 2012, A&A, 539, A95.
• Interference detection results with LOFAR — A.R. Offringa and A.G. de Bruyn, 2011, Proc. of the URSI General Assembly.
• A LOFAR RFI detection pipeline and its first results — A.R. Offringa, A.G. de Bruyn, S. Zaroubi, M. Biehl, Mar 2010, Proc. of Science, RFI2010.
• Post-correlation radio frequency interference classification methods — A.R. Offringa, A.G. de Bruyn, M. Biehl, S. Zaroubi, G. Bernardi, V.N. Pandey, Jun 2010, MNRAS, 405, 1, pp. 155–167.

Co-Authored Publications

Contributions to collaborative research papers across radio astronomy, imaging and reionization science.

• Efficient and Robust Path Openings using the Scale-Invariant Rank Operator — J.J. van de Gronde, A.R. Offringa and J.B.T.M. Roerdink, Apr 2016, Journal of Math. Imaging and Vision, ISSN 1573-7683, pp. 1–17.
• Modelling of the Spectral Energy Distribution of Fornax A: Leptonic and Hadronic Production of High Energy Emission from the Radio Lobes — B. McKinley, R. Yang, M. López-Caniego et al., Nov 2014, MNRAS, in press.
• Limits on low frequency radio emission from southern exoplanets with the Murchison Widefield Array — T. Murphy, M.E. Bell, D.L. Kaplan et al., Nov 2014, MNRAS, in press.
• The first Murchison Widefield Array low frequency radio observations of cluster scale non-thermal emission: the case of Abell 3667 — L. Hindson, M. Johnston-Hollitt, N. Hurley-Walker et al., Nov 2014, MNRAS, 445, pp. 330–346.
• Initial LOFAR observations of Epoch of Reionization windows: II. Diffuse polarized emission in the ELAIS-N1 field — V. Jelic, A.G. de Bruyn, M. Mevius et al., Aug 2014, A&A, 568, A101.
• Observing the Sun with the Murchison Widefield Array — D. Oberoi, R. Sharma, S. Bhatnagar et al., Aug 2014, Proc of URSI GASS, XXXIth URSI, 16–23 Aug 2014.
• Constraining the epoch of reionization with the variance statistic: simulations of the LOFAR case — A.H. Patil, S. Zaroubi, E. Chapman et al., Sep 2014, MNRAS, 443, 1113.
• The giant lobes of Centaurus A observed at 118 MHz with the Murchison Widefield Array — B. McKinley, F. Briggs, B.M. Gaensler, I.J. Feain, G. Bernardi, R.B. Wayth, M. Johnston-Hollitt, A.R. Offringa et al., Dec 2013, MNRAS, 436, pp. 1286–1301.
• LOFAR: The Low-Frequency Array — M.P. van Haarlem et al., Astronomy & Astrophysics, Vol. 556, Issue A2, Aug 2013.
• Probing reionization with LOFAR using 21-cm redshift space distortions — H. Jensen et al., Monthly Notices of the Royal Astronomical Society, Vol. 435, Oct 2013, pp. 460–474.
• Initial deep LOFAR observations of Epoch of Reionization windows: I. The North Celestial Pole — S. Yatawatta et al., Astronomy & Astrophysics, Vol. 550, Feb 2013, A136.
• Reionization and the Cosmic Dawn with the Square Kilometre Array — G. Mellema et al., Experimental Astronomy, Vol 36, Aug 2013, Issue 1–2, pp 235–318.
• LOFAR insights into the epoch of reionization from the cross power spectrum of 21cm emission and galaxies — R.P.C. Wiersma, B. Ciardi, R.M. Thomas, G.J.A. Harker, S. Zaroubi, G. Bernardi, M. Brentjens, A.G. de Bruyn, S. Daiboo, V. Jelić, S. Kazemi, L.V.E. Koopmans, P. Labropoulos, O. Martinez, G. Mellema, A.R. Offringa, V.N. Pandey, J. Schaye, V. Veligatla, H. Vedantham, S. Yatawatta, Monthly Notices of the Royal Astronomical Society, Vol 432, May 2013, Issue 3, pp. 2615–2624.
• M87 at metre wavelengths: the LOFAR picture — F. de Gasperin et al., Astronomy & Astrophysics, Vol. 547, Nov 2012, A56.
• LEDDB: LOFAR Epoch of Reionization Diagnostic Database — O. Martinez-Rubi, V.K. Veligatla, A.G. de Bruyn, P. Lampropoulos, A.R. Offringa, V. Jelić, S. Yatawatta, L.V.E. Koopmans, S. Zaroubi, Proc. of the Astronomical Data Analysis Software and Systems conf. XXII, Nov 2012, Uni. of Illinois.
• Prospects for detecting the 21 cm forest from the diffuse intergalactic medium with LOFAR — B. Ciardi et al., Monthly Notices of the Royal Astronomical Society, Vol 435, Oct 2013, Issue 2.
• Imaging neutral hydrogen on large-scales during the Epoch of Reionization with LOFAR — S. Zaroubi, A.G. de Bruyn, G. Harker, R.M. Thomas, P. Labropolous, V. Jelić, L.V.E. Koopmans, M.A. Brentjens, G. Bernardi, B. Ciardi, S. Daiboo, S. Kazemi, O. Martinez-Rubi, G. Mellema, A.R. Offringa, V.N. Pandey, J. Schaye, V. Veligatla, H. Vedantham, S. Yatawatta, Monthly Notices of the Royal Astronomical Society, Vol. 425, Oct 2012, pp. 2964–2973.
• First LOFAR observations at very low frequencies of cluster-scale non-thermal emission: the case of Abell 2256 — R.J. van Weeren et al., Astronomy & Astrophysics, Vol. 543, Jul 2012, A43.
• First LOFAR results on galaxy clusters — C. Ferrari et al., Proc. of the 2012 week of the French Society of Astronomy and Astrophysics (SF2A), Nice, Jun 2012.
• LOFAR: Recent imaging results & future prospects — G. Heald, M.R. Bell, A. Horneffer, A.R. Offringa, R. Pizzo et al., Proc. conf. Diffuse Relativistic Plasmas, March 2011.
• Foregrounds for observations of the cosmological 21 cm line: II. Westerbork observations of the fields around 3C196 and the North Celestial Pole — G. Bernardi, A.G. de Bruyn, G. Harker, M.A. Brentjens, B. Ciardi, V. Jelić, L.V.E. Koopmans, P. Labropoulos, A.R. Offringa, V.N. Pandey, J. Schaye, R.M. Thomas, S. Yatawatta, S. Zaroubi, Astronomy and Astrophysics, Volume 522, November 2010, A67.
• Power spectrum extraction for redshifted 21-cm Epoch of Reionization experiments: the LOFAR case — G. Harker, S. Zaroubi, G. Bernardi, M.A. Brentjens, A.G. de Bruyn, B. Ciardi, V. Jelić, L.V.E. Koopmans, P. Labropoulos, G. Mellema, A.R. Offringa, V.N. Pandey, A.H. Pawlik, J. Schaye, R.M. Thomas and S. Yatawatta, Monthly Notices of the Royal Astronomical Society, Volume 405, Issue 4, July 2010, pp. 2492–2504.
• Non-parametric foreground subtraction for 21-cm epoch of reionization experiments — G. Harker, S. Zaroubi, G. Bernardi, M.A. Brentjens, A.G. de Bruyn, B. Ciardi, V. Jelić, L.V.E. Koopmans, P. Labropoulos, A.R. Offringa, V.N. Pandey, J. Schaye and S. Yatawatta, Monthly Notices of the Royal Astronomical Society, Volume 397, Issue 2, July 2009, pp. 1138–1152.
• Foregrounds for observations of the cosmological 21 cm line. I. First Westerbork measurements of Galactic emission at 150 MHz in a low latitude field — G. Bernardi, A.G. de Bruyn, M.A. Brentjens, B. Ciardi, G. Harker, V. Jelić, L.V.E. Koopmans, P. Labropoulos, A.R. Offringa, V.N. Pandey, J. Schaye, R.M. Thomas, S. Yatawatta.
• Additional related publication — see the linked record for full details.

Posters, Reports and Other Work

• Poster: LOFAR interference detection pipeline
• SumThreshold technical report
• Master thesis
• 2007 — Simulating the intestine
• 2008 — Computational Physics MMC
• 2006 — Diffusion Limited Aggregation

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