Search Results - "van Haarlem, M. P."
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LOFAR imaging of Cygnus A – direct detection of a turnover in the hotspot radio spectra
Published in Monthly notices of the Royal Astronomical Society (11-12-2016)“…The low-frequency radio spectra of the hotspots within powerful radio galaxies can provide valuable information about the physical processes operating at the…”
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The discovery of two distant, massive clusters of galaxies in the ROSAT All-Sky Survey
Published in Monthly notices of the Royal Astronomical Society (11-03-2003)“…We discuss the radio, optical, and X-ray properties of two newly discovered, very X-ray luminous, distant clusters of galaxies. Both systems were noted as…”
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Projection effects in cluster catalogues
Published in Monthly notices of the Royal Astronomical Society (01-06-1997)“…We investigate the importance of projection effects in the identification of galaxy clusters in 2D galaxy maps and their effect on the estimation of cluster…”
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4
Needle-like structures discovered on positively charged lightning branches
Published in Nature (London) (01-04-2019)“…Lightning is a dangerous yet poorly understood natural phenomenon. Lightning forms a network of plasma channels propagating away from the initiation point with…”
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Sub-arcsecond imaging with the International LOFAR Telescope: II. Completion of the LOFAR Long-Baseline Calibrator Survey
Published 16-08-2021“…A&A 658, A2 (2022) The Low-Frequency Array (LOFAR) Long-Baseline Calibrator Survey (LBCS) was conducted between 2014 and 2019 in order to obtain a set of…”
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LOFAR MSSS: detection of a low-frequency radio transient in 400 h of monitoring of the North Celestial Pole
Published in Monthly notices of the Royal Astronomical Society (01-03-2016)“…We present the results of a four-month campaign searching for low-frequency radio transients near the North Celestial Pole with the Low-Frequency Array…”
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Cassiopeia A, Cygnus A, Taurus A, and Virgo A at ultra-low radio frequencies
Published 24-02-2020“…The four persistent radio sources in the northern sky with the highest flux density at metre wavelengths are Cassiopeia A, Cygnus A, Taurus A, and Virgo A;…”
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The dynamics of the outer regions of the Coma cluster
Published in Monthly notices of the Royal Astronomical Society (01-09-1993)“…We apply the spherical infall model to compare the observed distribution of radial velocities of galaxies around Coma with predictions that are based on…”
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9
Calibrating the absolute amplitude scale for air showers measured at LOFAR
Published 28-12-2015“…Journal of Instrumentation 10(11), P11005 - P11005 (2015) Air showers induced by cosmic rays create nanosecond pulses detectable at radio frequencies. These…”
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Corrigendum: A large light-mass component of cosmic rays at 10171017.5 electronvolts from radio observations
Published in Nature (London) (22-09-2016)Get full text
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Correction: Corrigendum: A large light-mass component of cosmic rays at 1017–1017.5 electronvolts from radio observations
Published in Nature (London) (22-09-2016)“…Nature 531, 70–73 (2016); doi:10.1038/nature16976 In this Letter, we omitted to cite preliminary results from the low-energy extension of the Pierre Auger…”
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A large light-mass component of cosmic rays at 1017–1017.5 electronvolts from radio observations
Published in Nature (London) (03-03-2016)“…High-resolution radio measurements of air showers—cascades of secondary particles in the atmosphere initiated by cosmic rays—reveal that cosmic rays with…”
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A large light-mass component of cosmic rays at 10171017.5 electronvolts from radio observations
Published in Nature (London) (03-03-2016)Get full text
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A large light-mass component of cosmic rays at 10^sup 17^-10^sup 17.5^ electronvolts from radio observations
Published in Nature (London) (03-03-2016)“…Observations were made with the Low Frequency Array (LOFAR13), a radio telescope consisting of thousands of crossed dipoles with built-in air-shower-detection…”
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A large light-mass component of cosmic rays at 10 17 –10 17.5 electronvolts from radio observations
Published in Nature (London) (2016)“…Cosmic rays are the highest-energy particles found in nature. Measurements of the mass composition of cosmic rays with energies of 10 17 –10 18 electronvolts…”
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High-fidelity copying of large-area astronomical plates: Principles and some practical results
Published in Monthly notices of the Royal Astronomical Society (15-03-1992)“…We report here on an investigation into the achieved fidelity of copies of a large Schmidt telescope plate. Atlas quality copies both on glass and film and the…”
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Corrigendum: A large light-mass component of cosmic rays at 10 17 -10 17.5 electronvolts from radio observations
Published in Nature (London) (22-09-2016)Get full text
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18
Corrigendum: A large light-mass component of cosmic rays at 1017-1017.5 electronvolts from radio observations
Published in Nature (London) (22-09-2016)Get full text
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19
The discovery of two distant, massive clusters of galaxies in the ROSAT All-Sky Survey
Published in Monthly notices of the Royal Astronomical Society (01-03-2003)Get full text
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20
Sub-arcsecond imaging with the International LOFAR Telescope I. Foundational calibration strategy and pipeline
Published 16-08-2021“…A&A 658, A1 (2022) [abridged] The International LOFAR Telescope is an interferometer with stations spread across Europe. With baselines of up to ~2,000 km,…”
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