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Orbital and superorbital variability of LS I +61 303 at low radio frequencies with GMRT and LOFAR
B. Marcote, M. Ribó, J. M. Paredes +23
LS I +61 303 is a gamma-ray binary that exhibits an outburst at GHz frequencies each orbital cycle of 26.5 d and a superorbital modulation with a period of 4.6…
LOFAR MSSS: Detection of a low-frequency radio transient in 400 hrs of monitoring of the North Celestial Pole
A. J. Stewart, R. P. Fender, J. W. Broderick +99
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 Mult…
A radio jet from the optical and x-ray bright stellar tidal disruption flare ASASSN-14li
Sjoert van Velzen, Gemma E. Anderson, Nicholas C. Stone +11
The tidal disruption of a star by a supermassive black hole leads to a short-lived thermal flare. Despite extensive searches, radio follow-up observations of known thermal stellar…
Wide-Band, Low-Frequency Pulse Profiles of 100 Radio Pulsars with LOFAR
M. Pilia, J. W. T. Hessels, B. W. Stappers +84
LOFAR offers the unique capability of observing pulsars across the 10-240 MHz frequency range with a fractional bandwidth of roughly 50%. This spectral range is well-suited for stu…
A connection between plasma conditions near black hole event horizons and outflow properties
K. I. I. Koljonen, D. M. Russell, J. A. Fernández Ontiveros +9
Accreting black holes are responsible for producing the fastest, most powerful outflows of matter in the Universe. The formation process of powerful jets close to black holes is po…
Wide-field LOFAR imaging of the field around the double-double radio galaxy B1834+620: A fresh view on a restarted AGN and doubeltjes
E. Orrú, S. van Velzen, R. F. Pizzo +8
The existence of double-double radio galaxies (DDRGs) is evidence for recurrent jet activity in AGN, as expected from standard accretion models. A detailed study of these rare sour…
The ASKAP/EMU Source Finding Data Challenge
A. M. Hopkins, M. T. Whiting, N. Seymour +31
The Evolutionary Map of the Universe (EMU) is a proposed radio continuum survey of the Southern Hemisphere up to declination +30 deg., with the Australian Square Kilometre Array Pa…
The LOFAR Multifrequency Snapshot Sky Survey (MSSS) I. Survey description and first results
G. H. Heald, R. F. Pizzo, E. Orrú +147
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 de…
High Spatial Resolution X-Ray Spectroscopy of the IC443 Pulsar Wind Nebula and Environs
Douglas A. Swartz, George G. Pavlov, Tracy Clarke +7
Deep Chandra ACIS observations of the region around the putative pulsar, CXOU J061705.3+222127, in the supernova remnant IC443 reveal an ~5-radius ring-like struct…
Microphysics and dynamics of the Gamma-Ray Burst 121024A
K. Varela, H. van Eerten, J. Greiner +28
Aims. The aim of the study is to constrain the physics of gamma-ray bursts (GRBs) by analysing the multi-wavelength afterglow data set of GRB 121024A that covers the full range fro…
The SKA view of Gamma-ray Bursts
Davide Burlon, Giancarlo Ghirlanda, Alexander van der Horst +5
Gamma-ray bursts (GRBs) are some of the most extreme events in the Universe. As well as providing a natural laboratory for investigating fundamental physical processes, they might…