Catherine R. Ferrari

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Context. The LOFAR (LOw Frequency ARray) radio telescope is a giant digital phased array interferometer with multiple antennas distributed in Europe. It provides discrete sets of Fourier components of the sky brightness. Recovering the original brightness distribution with aperture synthesis forms an inverse problem that can be solved by various(More)
The Open University's repository of research publications and other research outputs LOFAR Low-Band antenna observations of the 3C 295 and Botes fields: source counts and ultra-steep spectrum sources Journal Article (2014). LOFAR Low-Band antenna observations of the 3C 295 and Botes fields: source counts and ultra-steep spectrum sources. Astrophysical(More)
We present the first wide area (19 deg 2), deep (≈ 120–150 µJy beam −1), high resolution (5.6× 7.4 arcsec) LOFAR High Band Antenna image of the Boötes field made at 130-169 MHz. This image is at least an order of magnitude deeper and 3 − 5 times higher in angular resolution than previously achieved for this field at low frequencies. The observations and(More)
NenuFAR is both a giant extension of the LOFAR and a large standalone instrument in the low-frequency range (10-85 MHz). It was designed in Nançay with national and international collaboration. Antenna radiators were modeled on the LWA antenna design whereas preamplifiers were designed in France. Antennas will be distributed in 96 mini-arrays of 19(More)
The Evolutionary Map of the Universe (EMU) is a proposed radio continuum survey of the Southern Hemisphere up to declination +30 • , with the Australian Square Kilometre Array Pathfinder (ASKAP). EMU will use an automated source identification and measurement approach that is demonstrably optimal, to maximise the reliability and robustness of the resulting(More)
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 multi-frequency nature providing information about the spectral properties of the(More)
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 Mul-tifrequency Snapshot Sky Survey (MSSS). The data were recorded between 2011 December and 2012 April and comprised 2149 11-minute snapshots, each covering 175 deg 2. We have found(More)
The Open University's repository of research publications and other research outputs LOFAR Low-Band antenna observations of the 3C 295 and Botes fields: source counts and ultra-steep spectrum sources Journal Article (2014). LOFAR Low-Band antenna observations of the 3C 295 and Botes fields: source counts and ultra-steep spectrum sources. Astrophysical(More)
Faint undetected sources of radio-frequency interference (RFI) might become visible in long radio observations when they are consistently present over time. Thereby, they might obstruct the detection of the weak astronomical signals of interest. This issue is especially important for Epoch of Reionisation (EoR) projects that try to detect the faint(More)