T. E. Hassall

Tracking of an electron beam through the solar corona with LOFAR

G. Mann, Frank Breitling, C. Vocks, Henry Auraß et autres

The Sun’s activity leads to bursts of radio emission, among other phenomena. An example is type-III radio bursts. They occur frequently and appear as short-lived structures rapidly drifting from high to low frequencies in dynamic radio spectra. They are usually interpreted as …

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VizieR Online Data Catalog: LOFAR Boötes and 3C295 field sources (van Weeren+, 2014)

Reinout J. van Weeren, Wendy L. Williams, Cyril Tasse, Huub J. A. Röttgering et autres

The Boötes and 3C 295 fields were simultaneously observed on 2012 April 12 as part of a multi-beam observation with the LOFAR LBA stations. The idea behind the multi-beam setup is that we use the 3C 295 observations as a calibrator field …

LOFAR Bootes and 3C295 field sources

Reinout J. van Weeren, Wendy L. Williams, Cyril Tasse, Huub J. A. Röttgering et autres

Correction: Corrigendum: A large light-mass component of cosmic rays at 1017–1017.5 electronvolts from radio observations

S. Buitink, A. Corstanje, H. Falcke, J. R. Hörandel et autres

nl, de, au, gb, sk, us, fr, Afrique du Sud, fi, be (code pays fourni par la source)

VizieR Online Data Catalog: Pulse profiles of 100 radio pulsars (Pilia+, 2016)

M. Pilia, Jason W. T. Hessels, B. W. Stappers, V. I. Kondratiev et autres

Pulse profiles of 100 radio pulsars

M. Pilia, Jason W. T. Hessels, B. W. Stappers, V. I. Kondratiev et autres

The observed sample of pulsars was loosely based on a selection of the brightest objects in the LOFAR-visible sky (declination >-30°), using the ATNF Pulsar Catalog1 (Manchester et al., 2005AJ....129.1993M) for guidance. We observed 100 pulsars using the high-band antennas (HBAs) in …

LOFAR MSSS: detection of a low-frequency radio transient in 400 h of monitoring of the North Celestial Pole

Adam J. Stewart, Rob P. Fender, J. W. Broderick, T. E. Hassall et autres

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 (LOFAR), as part of the Multifrequency Snapshot Sky Survey (MSSS). The data were recorded between 2011 December and 2012 April …

A LOFAR census of millisecond pulsars

V. I. Kondratiev, Joris P. W. Verbiest, Jason W. T. Hessels, A. V. Bilous et autres

We report the detection of 48 millisecond pulsars (MSPs) out of 75 observed thus far using the LOw-Frequency ARray (LOFAR) in the frequency range 110–188 MHz. We have also detected three MSPs out of nine observed in the frequency range 38–77 MHz. …

ru, nl, de, gb, au, us, fr, Afrique du Sud, jp, it (code pays fourni par la source)

The LOFAR Multifrequency Snapshot Sky Survey (MSSS) I. Survey description and first results

George H. Heald, R. Pizzo, Emanuela Orrú, R. P. Breton et autres

We present the Multifrequency Snapshot Sky Survey (MSSS), the first northern-sky LOFAR imaging survey. In this introductory paper, we first describe in detail the motivation and design of the survey. Compared to previous radio surveys, MSSS is exceptional due to its intrinsic …

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Calibrating high-precision Faraday rotation measurements for LOFAR and the next generation of low-frequency radio telescopes (Corrigendum)

Carlos Sotomayor-Beltran, C. Sobey, Jason W. T. Hessels, Gianni De Bruyn et autres

This erratum corrects Figs. 2 and 3 of our original paper (Sotomayor-Beltran et al. 2013).Due to a simple error in plotting the input data, these maps of ionospheric total electron content (TEC) were inverted north-south and improperly stretched to match the underlying …

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The LOFAR Multifrequency Snapshot Sky Survey (MSSS)

George H. Heald, R. Pizzo, Emanuela Orrú, R. P. Breton et autres

We present the Multifrequency Snapshot Sky Survey (MSSS), the first northern-sky Low Frequency Array (LOFAR) imaging survey. In this introductory paper, we first describe in detail the motivation and design of the survey. Compared to previous radio surveys, MSSS is exceptional due …

nl, gb, fr, pl, de, au, us, nz, Afrique du Sud, se (code pays fourni par la source)

LOFAR discovery of a quiet emission mode in PSR B0823+26

C. Sobey, Neil J. Young, Jason W. T. Hessels, P. Weltevrede et autres

PSR B0823+26, a 0.53-s radio pulsar, displays a host of emission phenomena over time-scales of seconds to (at least) hours, including nulling, subpulse drifting, and mode-changing. Studying pulsars like PSR B0823+26 provides further insight into the relationship between these various emission phenomena …

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