274 citations · 2.7k across the 93 of their papers we have counts for
23 papers · 1 filter
Molecular gas properties in young stellar clusters with a suppressed star cluster wind
Sergiy Silich, Jean Turner, Jonathan Mackey +1
In compact and dense star-forming clouds a global star cluster wind could be suppressed. In this case the stellar feedback is unable to expel the leftover gas from the cluster. You…
Interaction between massive star winds and the interstellar medium
Jonathan Mackey
Massive stars drive strong winds that impact the surrounding interstellar medium, producing parsec-scale bubbles for isolated stars and superbubbles around young clusters. These bu…
PION: Simulations of Wind-Blown Nebulae
Jonathan Mackey, Samuel Green, Maria Moutzouri +6
We present an overview of PION, an open-source software project for solving radiation-magnetohydrodynamics equations on a nested grid, aimed at modelling asymmetric nebulae around…
PION: Simulating bow shocks and circumstellar nebulae
Jonathan Mackey, Samuel Green, Maria Moutzouri +4
Expanding nebulae are produced by mass loss from stars, especially during late stages of evolution. Multi-dimensional simulation of these nebulae requires high resolution near the…
Magnetic fields and Star Formation around HII regions: The S235 complex
R. Devaraj, D. P. Clemens, L. K. Dewangan +3
Magnetic fields are ubiquitous and essential in star formation. In particular, their role in regulating formation of stars across diverse environments like HII regions needs to be…
Simulations of Magnetised Stellar-Wind Bubbles
Jonathan Mackey, Samuel Green, Maria Moutzouri
Initial results are presented from 3D MHD modelling of stellar-wind bubbles around O stars moving supersonically through the ISM. We describe algorithm updates that enable high-res…
Thermal emission from bow shocks I: 2D Hydrodynamic Models of the Bubble Nebula
Samuel Green, Jonathan Mackey, Thomas J. Haworth +2
The Bubble Nebula (or NGC 7635) is a parsec-scale seemingly spherical wind-blown bubble around the relatively unevolved O star BD+602522. The small dynamical age of the neb…
The classical D-type expansion of spherical H II regions
Robin J. R. Williams, Thomas G. Bisbas, Thomas J. Haworth +1
Recent numerical and analytic work has highlighted some shortcomings in our understanding of the dynamics of H II region expansion, especially at late times, when the H II region a…
Non-Equilibrium Chemistry and Destruction of CO by X-ray Flares
Jonathan Mackey, Stefanie Walch, Daniel Seifried +3
Sources of X-rays such as active galactic nuclei and X-ray binaries are often variable by orders of magnitude in luminosity over timescales of years. During and after these flares…
Supernova-blast waves in wind-blown bubbles, turbulent, and power-law ambient media
Sebastian Haid, Stefanie Walch, Thorsten Naab +3
Supernova (SN) blast waves inject energy and momentum into the interstellar medium (ISM), control its turbulent multiphase structure and the launching of galactic outflows. Accurat…
Detecting stellar-wind bubbles through infrared arcs in HII regions
Jonathan Mackey, Thomas J. Haworth, Vasilii V. Gvaramadze +3
Mid-infrared arcs of dust emission are often seen near ionizing stars within HII regions. A possible explanations for these arcs is that they could show the outer edges of asymmetr…
Cold gas in hot star clusters: the wind from the red supergiant W26 in Westerlund 1
Jonathan Mackey, Norberto Castro, Luca Fossati +1
The massive red supergiant (RSG) W26 in Westerlund 1 is one of a growing number of RSGs shown to have winds that are ionized from the outside in. The fate of this dense wind materi…
Wind bubbles within H II regions around slowly moving stars
Jonathan Mackey, Vasilii V. Gvaramadze, Shazrene Mohamed +1
Interstellar bubbles around O stars are driven by a combination of the star's wind and ionizing radiation output. The wind contribution is uncertain because the boundary between th…
Effects of stellar evolution and ionizing radiation on the environments of massive stars
Jonathan Mackey, Norbert Langer, Shazrene Mohamed +3
We discuss two important effects for the astrospheres of runaway stars: the propagation of ionizing photons far beyond the astropause, and the rapid evolution of massive stars (and…
The Circumstellar Medium of Massive Stars in Motion
Jonathan Mackey, Norbert Langer, Dominique M. -A. Meyer +4
The circumstellar medium around massive stars is strongly impacted by stellar winds, radiation, and explosions. We use numerical simulations of these interactions to constrain the…
Pressure-driven fragmentation of clouds at high redshift
Harpreet Dhanoa, Jonathan Mackey, Jeremy Yates
The discovery of a hyper metal-poor star with total metallicity of Z, has motivated new investigations of how such objects can form from primordial gas pollut…
Dynamics of H II regions around exiled O stars
Jonathan Mackey, Norbert Langer, Vasilii V. Gvaramadze
At least 25 per cent of massive stars are ejected from their parent cluster, becoming runaways or exiles, travelling with often-supersonic space velocities through the interstellar…
Effects of Strong Magnetic Fields on Photoionised Clouds
Jonathan Mackey, Andrew J. Lim
Simulations are presented of the photoionisation of three dense gas clouds threaded by magnetic fields, showing the dynamical effects of different initial magnetic field orientatio…
Radiation-MHD simulations of pillars and globules in HII regions
Jonathan Mackey
Implicit and explicit raytracing-photoionisation algorithms have been implemented in the author's radiation-magnetohydrodynamics code. The algorithms are described briefly and thei…
Accuracy and Efficiency of Raytracing Photoionisation Algorithms
Jonathan Mackey
Three non-equilibrium photoionisation algorithms for hydrodynamical grid-based simulation codes are compared in terms of accuracy, timestepping criteria, and parallel scaling. Expl…
Radiation-MHD models of elephant trunks and globules in H II regions
Jonathan Mackey, Andrew J. Lim
We study the formation and evolution of pillars of dense gas, known as elephant trunks, at the boundaries of H II regions, formed by shadowing of ionising radiation by dense clumps…
Effects of Magnetic Fields on Photoionised Pillars and Globules
Jonathan Mackey, Andrew J. Lim
The effects of initially uniform magnetic fields on the formation and evolution of dense pillars and cometary globules at the boundaries of H II regions are investigated using 3D r…
Dynamical Models for the Formation of Elephant Trunks in H II Regions
Jonathan Mackey, Andrew J. Lim
The formation of pillars of dense gas at the boundaries of H II Regions is investigated with hydrodynamical numerical simulations including ionising radiation from a point source.…