J. Swinbank
A5075722206- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Stellar, planetary, and galactic studies
- Radio Wave Propagation Studies
- Astrophysical Phenomena and Observations
- Computational Physics and Python Applications
- Scientific Computing and Data Management
- GNSS positioning and interference
- Particle accelerators and beam dynamics
- Soil Moisture and Remote Sensing
- Superconducting and THz Device Technology
- Astro and Planetary Science
- Particle Accelerators and Free-Electron Lasers
- Environmental Monitoring and Data Management
- Advanced Optical Sensing Technologies
- Geophysics and Sensor Technology
- Technology Assessment and Management
- Advanced Electrical Measurement Techniques
- Geophysics and Gravity Measurements
Netherlands Institute for Radio Astronomy
2010-2023
AstroTec Holding (Netherlands)
2022-2023
Vera C. Rubin Observatory
2022
University of Washington
2018-2019
Princeton University
2015-2019
University of Amsterdam
2007-2016
Astronomical Institute of the Slovak Academy of Sciences
2009-2016
Amsterdam University of the Arts
2013-2015
Large Synoptic Survey Telescope Corporation
2015
Max Planck Institute for Astrophysics
2010
LOFAR, the LOw-Frequency ARray, is a new-generation radio interferometer constructed in north of Netherlands and across europe. Utilizing novel phased-array design, LOFAR covers largely unexplored low-frequency range from 10-240 MHz provides number unique observing capabilities. Spreading out core located near village Exloo northeast Netherlands, total 40 stations are nearing completion. A further five have been deployed throughout Germany, one station has built each France, Sweden, UK....
In this paper, we describe the optical imaging data processing pipeline developed for Subaru Telescope's Hyper Suprime-Cam (HSC) instrument. The HSC Pipeline builds on prototype being by Large Synoptic Survey Data Management system, adding customizations HSC, large-scale capabilities, and novel algorithms that have since been reincorporated into LSST codebase. While designed primarily to reduce Strategic Program (SSP) data, it is also recommended reducing general-observer data. includes high...
Low frequency radio waves, while challenging to observe, are a rich source of information about pulsars. The LOw Frequency ARray (LOFAR) is new interferometer operating in the lowest 4 octaves ionospheric "radio window": 10-240MHz, that will greatly facilitate observing pulsars at low frequencies. Through huge collecting area, long baselines, and flexible digital hardware, it expected LOFAR revolutionize astronomy frequencies visible from Earth. next-generation telescope pathfinder Square...
The Large Synoptic Survey Telescope (LSST) is a large-aperture, wide-field, ground-based survey system that will image the sky in six optical bands from 320 to 1050 nm, uniformly covering approximately $18,000$deg$^2$ of over 800 times. LSST currently under construction on Cerro Pachón Chile, and expected enter operations 2022. Once operational, explore wide range astrophysical questions, discovering "killer" asteroids examining nature Dark Energy. generate average 15 TB data per night,...
PFS (Prime Focus Spectrograph), a next generation facility instrument on the 8.2-meter Subaru Telescope, is very wide-field, massively multiplexed, optical and near-infrared spectrograph. Exploiting prime focus, 2394 reconfigurable fibers will be distributed over 1.3 deg field of view. The spectrograph has been designed with 3 arms blue, red, cameras to simultaneously observe spectra from 380nm 1260nm in one exposure at resolution ~1.6-2.7A. An international collaboration developing this...
Context. The LOw Frequency ARray (LOFAR) radio telescope is a giant digital phased array interferometer with multiple antennas distributed in Europe. It provides discrete sets of Fourier components the sky brightness. Recovering original brightness distribution aperture synthesis forms an inverse problem that can be solved by various deconvolution and minimization methods Aims. Recent papers have established clear link between nature interferometry measurement "compressed sensing" (CS)...
We present the Multifrequency Snapshot Sky Survey (MSSS), first northern-sky LOFAR imaging survey. In this introductory paper, we describe in detail motivation and design of Compared to previous radio surveys, MSSS is exceptional due its intrinsic multifrequency nature providing information about spectral properties detected sources over more than two octaves (from 30 160 MHz). The broadband frequency coverage, together with fast survey speed generated by LOFAR's multibeaming capabilities,...
We report the detection of 48 millisecond pulsars (MSPs) out 75 observed thus far using LOFAR in frequency range 110-188 MHz. have also detected three MSPs nine 38-77 This is largest sample ever at these low frequencies, and half were for first time frequencies below 200 present average pulse profiles MSPs, their effective widths, flux densities compare with higher observing frequencies. The flux-calibrated, multifrequency are publicly available via EPN Database Pulsar Profiles. values...
M87 is a giant elliptical galaxy located in the centre of Virgo cluster, which harbours supermassive black hole mass 6.4x10^9 M_sun, whose activity responsible for extended (80 kpc) radio lobes that surround galaxy. The energy generated by matter falling onto central ejected and transferred to intra-cluster medium via relativistic jet morphologically complex systems buoyant bubbles, rise towards edges halo. Here we present first observations made with new Low-Frequency Array (LOFAR) at...
The low frequency array (LOFAR), is the first radio telescope designed with capability to measure emission from cosmic-ray induced air showers in parallel interferometric observations. In $\sim 2\,\mathrm{years}$ of observing, 405 events energy range $10^{16} - 10^{18}\,\mathrm{eV}$ have been detected band $30 80\,\mathrm{MHz}$. Each these registered up $\sim1000$ independent antennas resulting measurements unprecedented detail. This article describes dataset, as well analysis pipeline, and...
Dispersion in the interstellar medium is a well known phenomenon that follows simple relationship, which has been used to predict time delay of dispersed radio pulses since late 1960s. We performed wide-band simultaneous observations four pulsars with LOFAR (at 40-190 MHz), 76-m Lovell Telescope 1400 MHz) and Effelsberg 100-m 8000 test accuracy dispersion law over broad frequency range. In this paper we present results these show accurate better than 1 part 100000 across our observing band....
We present the highest-quality polarisation profiles to date of 16 non-recycled pulsars and four millisecond pulsars, observed below 200 MHz with LOFAR high-band antennas. Based on profiles, we perform an initial investigation expected observational effects resulting from propagation polarised emission in pulsar magnetosphere interstellar medium. The predictions magnetospheric birefringence have been tested using spectra pulse width fractional multifrequency data. derived offer only partial...
We have conducted two pilot surveys for radio pulsars and fast transients with the Low-Frequency Array (LOFAR) around 140 MHz here report on first low-frequency fast-radio burst limit discovery of new pulsars. The survey, LOFAR Pilot Pulsar Survey (LPPS), observed a large fraction northern sky, ~1.4 x 10^4 sq. deg, 1-hr dwell times. Each observation covered ~75 deg using 7 independent fields formed by incoherently summing high-band antenna fields. second Tied-Array (LOTAS), spanned ~600...
Aims. This paper discusses the spectral occupancy for performing radio astronomy with Low-Frequency Array (LOFAR), a focus on imaging observations.
(abridged). We outline LBCS (the LOFAR Long-Baseline Calibrator Survey), whose aim is to identify sources suitable for calibrating the highest-resolution observations made with International Telescope, which include baselines >1000 km. Suitable must contain significant correlated flux density (50-100mJy) at frequencies around 110--190~MHz on scales of a few hundred mas. At least 200--300-km international baselines, we find 1 calibrator source per square degree over large part northern...
Abell 2256 is one of the best known examples a galaxy cluster hosting large-scale diffuse radio emission that unrelated to individual galaxies. It contains both giant halo and relic, as well number head-tail sources smaller steep-spectrum sources. The origin halos relics still being debated, but over last years it has become clear presence these closely related merger events. Here we present results from first LOFAR Low band antenna (LBA) observations between 18 67 MHz. To our knowledge,...
We present the results of a four-month campaign searching for low-frequency radio transients near North Celestial Pole with Low-Frequency Array (LOFAR), as part Multifrequency Snapshot Sky Survey (MSSS). The data were recorded between 2011 December and 2012 April comprised 2149 11-minute snapshots, each covering 175 deg^2. have found one convincing candidate astrophysical transient, duration few minutes flux density at 60 MHz 15-25 Jy. transient does not repeat has no obvious optical or...
The low-frequency radio spectra of the hotspots within powerful galaxies can provide valuable information about physical processes operating at site jet termination. These are responsible for dissipation kinetic energy, particle acceleration, and magnetic-field generation. Here, we report new observations galaxy Cygnus A using Low Frequency Array (LOFAR) between 109 183 MHz, an angular resolution ∼3.5 arcsec. emission lobes is found to have a complex spectral index distribution, with...
Context. Observing Jupiter's synchrotron emission from the Earth remains today sole method to scrutinize distribution and dynamical behavior of ultra energetic electrons magnetically trapped around planet (because in-situ particle data are limited in inner magnetosphere). Aims. We perform first resolved low-frequency imaging with LOFAR at 127 MHz. The radiation comes low energy (~1-30 MeV) which map a broad region magnetosphere. Methods (see article for complete abstract) Results. images...
We present measurements of radio emission from cosmic ray air showers that took place during thunderstorms. The intensity and polarization patterns these are radically different those measured fair-weather conditions. With the use a simple two-layer model for atmospheric electric field, can be well reproduced by state-of-the-art simulation codes. This in turn provides novel way to study fields.