Ian Heywood
A5016632590- Radio Astronomy Observations and Technology
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Pulsars and Gravitational Waves Research
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Superconducting and THz Device Technology
- Astronomical Observations and Instrumentation
- Visual Culture and Art Theory
- Art, Politics, and Modernism
- Antenna Design and Optimization
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- Geophysics and Gravity Measurements
- Advanced Thermodynamic Systems and Engines
- Spectroscopy and Laser Applications
- High-pressure geophysics and materials
- Computational Physics and Python Applications
- Social and Cultural Dynamics
- Soil Moisture and Remote Sensing
- Adaptive optics and wavefront sensing
- Mechanics and Biomechanics Studies
University of Oxford
2013-2025
South African Radio Astronomy Observatory
2019-2025
Rhodes University
2016-2025
Astronomical Observatory
2024
University of Dundee
2023
Royal Astronomical Society
2022
Commonwealth Scientific and Industrial Research Organisation
2014-2018
National Aeronautics and Space Administration
2018
Astronomy and Space
2015-2018
Rutgers, The State University of New Jersey
2018
Abstract The inner ∼200 pc region of the Galaxy contains a 4 million M ⊙ supermassive black hole (SMBH), significant quantities molecular gas, and star formation cosmic-ray energy densities that are roughly two orders magnitude higher than corresponding levels in Galactic disk. At distance only 8.2 kpc, presents astronomers with unique opportunity to study diverse range energetic astrophysical phenomena, from stellar objects extreme environments, SMBH star-formation-driven feedback processes...
Relativistic jets are streams of plasma moving at appreciable fractions the speed light. They have been observed from stellar mass black holes ($\sim$3$-$20 solar masses, M$_\odot$) as well supermassive ($\sim$10$^6$$-$10$^9$ found in centres most galaxies. Jets should also be produced by intermediate ($\sim$10$^2$$-$10$^5$ M$_\odot$), although evidence for this third class hole has until recently weak. We report detection transient radio emission location candidate ESO 243-49 HLX-1, which...
Abstract We present new 0.6–10 GHz observations of the binary neutron star merger GW170817 covering period up to 300 days post-merger, taken with upgraded Karl G. Jansky Very Large Array, Australia Telescope Compact Giant Metrewave Radio and MeerKAT telescope. use these data precisely characterize decay phase late-time radio light curve. find that temporal is consistent a power-law slope t −2.2 , transition between rise relatively sharp. Such cannot be produced by quasi-isotropic...
We present results from the first twelve months of operation Radio Galaxy Zoo, which upon completion will enable visual inspection over 170,000 radio sources to determine host galaxy emission and morphology. Zoo uses $1.4\,$GHz images both Faint Images Sky at Twenty Centimeters (FIRST) Australia Telescope Large Area Survey (ATLAS) in combination with mid-infrared $3.4\,\mu$m {\it Wide-field Infrared Explorer} (WISE) $3.6\,\mu$m Spitzer Space Telescope}. early analysis WISE colours galaxies....
We present the confusion-limited 1.28 GHz MeerKAT DEEP2 image covering one $\approx 68'$ FWHM primary beam area with $7.6''$ resolution and $0.55 \pm 0.01$ $\mu$Jy/beam rms noise. Its J2000 center position $\alpha=04^h 13^m 26.4^s$, $\delta=-80^\circ 00' 00''$ was selected to minimize artifacts caused by bright sources. introduce new 64-element array describe commissioning observations measure attenuation pattern, estimate telescope pointing errors, pinpoint $(u,v)$ coordinate errors offsets...
MeerKAT’s large number (64) of 13.5 m diameter antennas, spanning 8 km with a densely packed 1 core, create powerful instrument for wide-area surveys, high sensitivity over wide range angular scales. The MeerKAT Galaxy Cluster Legacy Survey (MGCLS) is programme long-track L -band (900−1670 MHz) observations 115 galaxy clusters, observed ∼6−10 h each in full polarisation. first legacy product data release (DR1), made available this paper, includes the visibilities, basic image cubes at ∼8″...
ABSTRACT MIGHTEE is a galaxy evolution survey using simultaneous radio continuum, spectropolarimetry, and spectral line observations from the South African MeerKAT telescope. When complete, will image ∼20 deg2 over COSMOS, E-CDFS, ELAIS-S1, XMM-Newton Large Scale Structure field (XMM-LSS) extragalactic deep fields with central frequency of 1284 MHz. These were selected based on extensive multiwavelength data sets numerous existing forthcoming observational campaigns. Here, we describe...
For the first $\sim3$ years after binary neutron star merger event GW 170817 radio and X-ray radiation has been dominated by emission from a structured relativistic off-axis jet propagating into low-density medium with n $< 0.01\,\rm{cm^{-3}}$. We report on observational evidence for an excess of at $\delta t>900$ days merger. With $L_x\approx5\times 10^{38}\,\rm{erg\,s^{-1}}$ 1234 days, recently detected represents $\ge 3.2\,\sigma$ (Gaussian equivalent) deviation universal post jet-break...
ABSTRACT We present the SARAO MeerKAT Galactic Plane Survey (SMGPS), a 1.3 GHz continuum survey of almost half (251° ≤l ≤ 358° and 2° 61° at |b| $1{_{.}^{\circ}}5$). SMGPS is largest, most sensitive, highest angular resolution 1 plane yet carried out, with an 8 arcsec broad-band root-mean-square sensitivity ∼10–20 μJy beam−1. Here, we describe first publicly available data release from which comprises cubes frequency-resolved images over 908–1656 MHz, power-law fits to images, zeroth moment...
ABSTRACT The MeerKAT International GigaHertz Tiered Extragalactic Exploration (MIGHTEE) is one of the large survey projects, designed to pathfind SKA key science. MIGHTEE undertaking deep radio imaging four well-observed fields (COSMOS, XMM-LSS, ELAIS S1, and CDFS) totaling 20 square degrees μJy sensitivities. Broad-band observations between 880 and1690 MHz yield total intensity continuum, spectro-polarimetry, atomic hydrogen spectral imaging. Early science data from are being released...
Abstract Medium-timescale (minutes to hours) radio transients are a relatively unexplored population. The wide field-of-view and high instantaneous sensitivity of instruments such as MeerKAT provides an opportunity probe this class sources, using image-plane detection techniques. We aim systematically mine archival synthesis imaging data in order search for medium-timescale variables that not detected by conventional long-track image deploy prototype blind transient variable pipeline named...
Abstract Medium-timescale (minutes to hours) radio transients are a relatively unexplored population. The wide field-of-view and high instantaneous sensitivity of instruments such as MeerKAT provides an opportunity probe this class sources, using image-plane detection techniques. previous letter in series describes our project associated TRON pipeline designed mine archival data for transient variable sources. In letter, we report on new transient, flare, with Gaia DR3 6865945581361480448, G...
Context. Black holes, both supermassive and stellar-mass, impact the evolution of their surroundings on a large range scales. While role black holes is well studied, effects stellar-mass surroundings, particularly in inducing structures interstellar medium (ISM), remain under explored. Aims. This study focuses hole X-ray binary GRS 1915+105, renowned for its active jets, primary aim to unveil characterise 1915+105 environment by identifying induced jet–ISM interaction. Methods. We observed...
The MIGHTEE large survey project will four of the most well-studied extragalactic deep fields, totalling 20 square degrees to $\mu$Jy sensitivity at Giga-Hertz frequencies, as well an ultra-deep image a single ~1 degree MeerKAT pointing. observations provide radio continuum, spectral line and polarisation information. As such, MIGHTEE, along with excellent multi-wavelength data already available in these allow range science be achieved. Specifically, is designed significantly enhance our...
We discuss the ground-breaking science that will be possible with a wide area survey, using MeerKAT telescope, known as MeerKLASS (MeerKAT Large Area Synoptic Survey). The current specifications of make it great fit for applications require large survey speeds but not necessarily high angular resolutions. In particular, cosmology, over $\sim 4,000 \, {\rm deg}^2$ 4,000$ hours potentially provide first ever measurements baryon acoustic oscillations 21cm intensity mapping technique, enough...
We present the H I emission project within MIGHTEE survey, currently being carried out with newly commissioned MeerKAT radio telescope. This is one of first deep, blind, medium-wide interferometric surveys for neutral hydrogen (H ) ever undertaken, extending our knowledge to z = 0.6. The science goals this medium-deep, survey are extensive, including evolution gas content galaxies over past 5 billion years. Simulations predict nearly 3000 0 < 0.4 will be detected directly in , statistical...
ABSTRACT We present the radio and X-ray monitoring campaign of 2019/2020 outburst MAXI J1348–630, a new black hole binary (BH XRB) discovered in 2019 January. observed J1348–630 for ∼14 months band with MeerKAT Australia Telescope Compact Array, X-rays Swift/XRT. Throughout outburst, we detected tracked evolution compact transient jets. Following main system underwent at least four hard-state-only re-flares, during which jets were again detected. For major rise, quenching reactivation jets,...
Abstract We present the full panchromatic afterglow light-curve data of GW170817, including new radio as well archival optical and X-ray data, between 0.5 940 days post-merger. By compiling all reprocessing a subset it, we have evaluated impact differences in processing or flux determination methods used by different groups attempted to mitigate these provide more uniform set. Simple power-law fits light curve indicate t 0.86±0.04 rise, −1.92±0.12 decline, peak occurring at 155 ± 4 days. The...
ABSTRACT Odd radio circles (ORCs) are recently-discovered faint diffuse of emission, unknown cause, surrounding galaxies at moderate redshift (z ∼ 0.2 – 0.6). Here, we present detailed new MeerKAT images 1284 MHz the first ORC, originally discovered with Australian Square Kilometre Array Pathfinder, higher resolution (6 arcsec) and sensitivity (∼ 2.4 μJy/beam). In addition to images, which reveal a complex internal structure consisting multiple arcs, also polarization spectral index maps....
Abstract We present high-pass-filtered continuum images of the inner 3.°5 × 2.°5 Galactic center at 20 cm with 6.″4 resolution. These mosaic are taken MeerKAT and reveal a large number narrow filaments, roughly an order magnitude increase in their numbers compared to past measurements. For first time, we carry out population studies spectral index magnetic field entire region. The mean indices filaments steeper than supernova remnants (SNRs) (−0.62) value α ∼ −0.83. variation is much larger...