Explanipedia

MeerKAT observations of white dwarf pulsars Open

Emil Meintjes, M. Geyer, Ian Heywood, Manisha Caleb · 2025

Erratum: “Statistical Properties of the Population of the Galactic Center Filaments: The Spectral Index and Equipartition Magnetic Field” (2022, ApJ, 925, L18) Open

F. Yusef‐Zadeh, Ian Heywood, W. D. Cotton · 2025

Tracing AGN-Galaxy Co-Evolution with UV Line-Selected Obscured AGN Open

Julien Larena, M. Vaccari, I. Prandoni, R. Gilli, M. Mignoli , et al. · 2025

Understanding black hole-galaxy co-evolution and the role of AGN feedback requires complete AGN samples, including heavily obscured systems. In this work, we present the first UV line-selected ([Nev]3426 and CIV1549) sample of obscured AGN…

Tracing AGN-Galaxy Co-Evolution with UV Line-Selected Obscured AGN Open

M. Vaccari, F. Pozzi, R. Gilli, M. Mignoli, C. L. Hale , et al. · 2025

Understanding black hole–galaxy co-evolution and the role of AGN feedback requires complete AGN samples, including heavily obscured systems. Such sources are key to constraining the black hole accretion rate density over cosmic time, yet t…

Neutral Atomic Hydrogen in a Star-forming Galaxy 7 Billion Years Ago Open

Roger Deane, Tariq Blecher, Danail Obreschkow, Ian Heywood, S. Ranchod · 2025

Neutral atomic hydrogen (HI) constitutes a key phase of the cosmic baryon cycle, bridging the ionised circumgalactic medium and the star-forming molecular gas. Yet, nearly 75 years after its discovery, direct views of HI through its 21cm e…

Neutral Atomic Hydrogen in a Star-forming Galaxy 7 Billion Years Ago Open

Gordon Lawrie, Roger Deane, Tariq Blecher, Danail Obreschkow, Ian Heywood , et al. · 2025

Neutral atomic hydrogen (HI) constitutes a key phase of the cosmic baryon cycle, bridging the ionised circumgalactic medium and the star-forming molecular gas. Yet, nearly 75 years after its discovery, direct views of HI through its 21 cm …

MIGHTEE-H i : the M H i - M * relation of massive galaxies and the H i mass function at 0.25 < z < 0.5 Open

Hengxing Pan, M. J. Jarvis, Ian Heywood, Tariq Yasin, Natasha Maddox , et al. · 2025

The relationship between the already formed stellar mass in a galaxy and the gas reservoir of neutral atomic hydrogen, is a key element in our understanding of how gas is turned into stars in galaxy haloes. In this paper, we measure the $M…

A Catalog of Filaments in the Central Molecular Zone Open

Richard G. Arendt, F. Yusef‐Zadeh, Ian Heywood · 2025

We present a catalog of 1.28 GHz radio filaments observed by MeerKAT over the innermost 200 pc of the Galaxy (roughly $\pm 1.5°$), which includes the central molecular zone (CMZ). The catalog is generated by repurposing software developed …

MIGHTEE-H i : the direct detection of neutral hydrogen in galaxies at z > 0.25 Open

M. J. Jarvis, Madalina N. Tudorache, Ian Heywood, Anastasia A Ponomareva, M. Baes , et al. · 2025

Atomic hydrogen constitutes the gas reservoir from which molecular gas and star formation in galaxies emerges. However, the weakness of the line means it has been difficult to directly detect in all but the very local Universe. Here, we pr…

Relativistic precessing jets powered by an accreting neutron star Open

F. J. Cowie, R. P. Fender, Ian Heywood, A.K. Hughes, K Savard , et al. · 2025

Precessing relativistic jets launched by compact objects are rarely directly measured, and present an invaluable opportunity to better understand many features of astrophysical jets. In this Letter we present MeerKAT radio observations of …

Evidence for inverse Compton scattering in high-redshift Lyman-break galaxies Open

I. H. Whittam, M. J. Jarvis, E. J. Murphy, Nathan Adams, R. A. A. Bowler , et al. · 2025

Radio continuum emission provides a unique opportunity to study star formation unbiased by dust obscuration. However, if radio observations are to be used to accurately trace star formation to high redshifts, it is crucial that the physica…

Hi gas in the rejuvenated radio galaxy PKS 2014–55 Open

Leon Mtshweni, K. Thorat, Roger Deane, B. S. Frank, F. M. Maccagni , et al. · 2025

We present new high-spectral-resolution MeerKAT observations of $\textrm {H}\, \scriptstyle \mathrm{I}$ absorption against the central region of the restarted, giant, X-shaped radio galaxy PKS2014–55, which exhibits morphological evidence …

A relativistic jet from a neutron star breaking out of its natal supernova remnant Open

K V S Gasealahwe, K Savard, I. M. Monageng, Ian Heywood, R. P. Fender , et al. · 2025

The young neutron star X-ray binary, Cir X-1, resides within its natal supernova remnant and experiences ongoing outbursts every 16.5 d, likely due to periastron passage in an eccentric orbit. We present the deepest ever radio image of the…

MIGHTEE: A first look at MIGHTEE quasars Open

S. V. White, I. Delvecchio, Nathan Adams, Ian Heywood, I. H. Whittam , et al. · 2025

In this work we study a robust, Ks-band complete, spectroscopically-confirmed sample of 104 unobscured (Type-1) quasars within the COSMOS and XMM-LSS fields of the MeerKAT International GHz Tiered Extragalactic Exploration (MIGHTEE) Survey…

The accretion–ejection connection in the black hole X-ray binary MAXI J1820+070 Open

Joe Bright, R. P. Fender, D. M. Russell, S. Motta, Ethan Man , et al. · 2025

The black hole X-ray binary MAXI J1820$+$070 began its first recorded outburst in March 2018, and remained an active radio, X-ray, and optical source for over 4 yr. Due to the low distance to the source and its intrinsically high luminosit…

MIGHTEE-HI: the radial acceleration relation with resolved stellar mass measurements Open

Andreea Vărăşteanu, M. J. Jarvis, Anastasia A Ponomareva, Harry Desmond, Ian Heywood , et al. · 2025

The radial acceleration relation (RAR) is a fundamental relation linking baryonic and dark matter in galaxies by relating the observed acceleration derived from dynamics to the one estimated from the baryonic mass. This relation exhibits s…

The VLA Frontier Fields Survey: A 6GHz High-resolution Radio Survey of Abell 2744 Open

Esteban Orozco, Eric F. Jiménez-Andrade, E. J. Murphy, Ian Smail, Emmanuel Momjian , et al. · 2025

We present a 6GHz radio continuum image of the galaxy cluster Abell 2744 ($z = 0.307$) obtained with the Karl G. Jansky Very Large Array (VLA) as part of the VLA Frontier Fields program, whose goal is to explore the radio continuum emissio…

Relativistic ejecta from stellar mass black holes: insights from simulations and synthetic radio images Open

K Savard, James Matthews, Rob Fender, Ian Heywood · 2025

We present numerical simulations of discrete relativistic ejecta from an X-ray binary (XRB) with initial conditions directly informed by observations. XRBs have been observed to launch powerful discrete plasma ejecta during state transitio…

MIGHTEE-HI: The radial acceleration relation with resolved stellar mass measurements Open

Andreea Vărăşteanu, M. J. Jarvis, Anastasia A. Ponomareva, Harry Desmond, Ian Heywood , et al. · 2025

The radial acceleration relation (RAR) is a fundamental relation linking baryonic and dark matter in galaxies by relating the observed acceleration derived from dynamics to the one estimated from the baryonic mass. This relation exhibits s…

A MeerKAT survey of nearby dwarf novae: I. New detections Open

J. Kersten, Elmar Körding, P. A. Woudt, P. Groot, D. R. Williams , et al. · 2025

A programme to search for radio emission from dwarf-novae-type cataclysmic variables was conducted with the South African MeerKAT radio telescope. The dwarf novae RU Pegasi, V426 Ophiuchi, and IP Pegasi were detected during outburst at L b…

Quantifying jet–interstellar medium interactions in Cyg X-1: Insights from dual-frequency bow shock detection with MeerKAT Open

P. Atri, S. Motta, J. van den Eijnden, James Matthews, J. C. A. Miller‐Jones , et al. · 2025

Context. Accretion and outflows are astrophysical phenomena observed across a wide range of objects, from white dwarfs to supermassive black holes. Developing a complete picture of these processes requires complementary studies across this…

MeerKAT discovers a jet-driven bow shock near GRS 1915+105 Open

S. Motta, P. Atri, James Matthews, J. van den Eijnden, R. P. Fender , et al. · 2025

Context. Black holes, both supermassive and stellar-mass, impact the evolution of their surroundings on a large range of scales. While the role of supermassive black holes is well studied, the effects of stellar-mass black holes on their s…

Non-thermal filaments and AGN recurrent activity in the galaxy group Nest200047: A LOFAR, uGMRT, MeerKAT, and VLA radio spectral analysis Open

M. Brienza, K. Rajpurohit, E. Churazov, Ian Heywood, M. Brüggen , et al. · 2025

Nest200047 is one of the clearest examples of multiple radio bubbles from an active galactic nucleus (AGN) observed in a galaxy group. It also features a complex system of non-thermal filaments, likely shaped by buoyancy and gas motions in…

Mining the time axis with TRON – I. Millisecond pulsars in Omega Centauri, Terzan 5, and 47 Tucanae detected through MeerKAT interferometric imaging Open

O. Smirnov, Ian Heywood, M. Geyer, Talon Myburgh, C. Tasse , et al. · 2025

Medium-time-scale (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 to probe this class of sources, …

Mining the time axis with TRON – II. MeerKAT detects a stellar radio flare from a distant RS CVn candidate Open

O. Smirnov, Aaron Golden, Talon Myburgh, B. Ngcebetsha, C. Tasse , et al. · 2025

Medium-time-scale (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 to probe this class of sources, …

Supernova remnants on the outskirts of the Large Magellanic Cloud Open

M. Sasaki, Federico Zangrandi, M. D. Filipović, R. Z. E. Alsaberi, Jordan Collier , et al. · 2024

When a star dies, it can explode in a supernova, causing a strong shock wave and forming an interstellar object called a supernova remnant (SNR). Observational studies of SNRs allow us to learn about the different types of progenitors, the…

Montage and Radio Astronomy Open

G. Bruce Berriman, John Good, Ian Heywood, Robert K. Moseley · 2024

The Montage Image Mosaic Engine, first released in 2002, has found applicability across the electromagnetic spectrum to support data processing and visualization. This broad applicability has come about through its design as an Open Source…

Africanus III. pfb-imaging -- a flexible radio interferometric imaging suite Open

Hertzog L. Bester, Jonathan S. Kenyon, Audrey Repetti, Simon Perkins, O. Smirnov , et al. · 2024

The popularity of the CLEAN algorithm in radio interferometric imaging stems from its maturity, speed, and robustness. While many alternatives have been proposed in the literature, none have achieved mainstream adoption by astronomers work…

A spatially resolved spectral analysis of giant radio galaxies with MeerKAT Open

Kate Charlton, J. Delhaize, K. Thorat, Ian Heywood, M. J. Jarvis , et al. · 2024

In this study we report the spatially resolved, wideband spectral properties of three giant radio galaxies (GRGs) in the COSMOS field: MGTC J095959.63+024608.6, MGTC J100016.84+015133.0, and MGTC J100022.85+031520.4. One of these galaxies,…

A spatially-resolved spectral analysis of giant radio galaxies with MeerKAT Open

Kate Charlton, J. Delhaize, K. Thorat, Ian Heywood, M. J. Jarvis , et al. · 2024

In this study we report spatially resolved, wideband spectral properties of three giant radio galaxies (GRGs) in the COSMOS field: MGTC J095959.63+024608.6 , MGTC J100016.84+015133.0 and MGTC J100022.85+031520.4. One such galaxy MGTC J1000…

Ian Heywood YOU? Author Swipe