Diffuse Hot Plasma in the Interstellar Medium and Galactic Outflows

Sasaki, M.; Ponti, G.; Mackey, Jonathan

doi:10.1007/978-981-16-4544-0_91-1

Cited by 1 publication

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“…This detection is important for measuring the energy content of wind bubbles, and to constrain effectiveness of physical processes such as thermal conduction and instability-driven turbulent mixing. These are the primary energy loss mechanisms for the hot phase of the ISM [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Simulating Wind-Blown Nebulae from Single and Binary Massive Stars

Mackey

2024

J. Phys.: Conf. Ser.

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Winds from massive stars expand supersonically into their surroundings, creating dynamic and fascinating nebulae that can give us insight into physical processes in interstellar plasma, and into the evolutionary history of the stars. Around single stars, parsec-scale bubbles such as bow shocks and ring nebulae are formed, whereas in colliding-wind binary (CWB) systems the high wind density produces intense time- and space-dependent emission across the electromagnetic spectrum from radio to gamma-rays. This contribution summarizes some recent results from 3D MHD modelling of bow shocks around runaway stars such as ζ Oph, and of the wind-collision zone of the CWB systems WR140 and WR21a. A resolution study of 3D simulations of bow shocks shows that X-ray emission from the shocked wind is time-variable and that converged results can be obtained once the Kelvin-Helmholtz instability at the contact discontinuity is resolved. Simulations of the CWB system WR140 show that inverse-Compton cooling of the shocked plasma can trigger runaway cooling when the orbit is near periastron, producing strong compression and dynamical instabilities. This sharply reduces the hard-X-ray emission around periastron, in agreement with observations. Scaling tests of the simulation software pion are also presented for a model of the CWB system WR21a run on up to 8192 cores using the HPC system Karolina.

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Section: Introductionmentioning

confidence: 99%

Simulating Wind-Blown Nebulae from Single and Binary Massive Stars

Mackey

2024

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

Diffuse Hot Plasma in the Interstellar Medium and Galactic Outflows

Cited by 1 publication

References 138 publications

Simulating Wind-Blown Nebulae from Single and Binary Massive Stars

Simulating Wind-Blown Nebulae from Single and Binary Massive Stars

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