A Brief Galactic Winds and the Role Played by Massive Stars

Heckman, Timothy M.; Thompson, Todd A.

doi:10.1007/978-3-319-20794-0_23-1

Handbook of Supernovae 2016

DOI: 10.1007/978-3-319-20794-0_23-1

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A Brief Galactic Winds and the Role Played by Massive Stars

Timothy M. Heckman¹,

Todd A. Thompson²

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2019

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“…Thus, the question remains open and the parameter space to explore in all models is still too broad to draw strong conclusions. The reader is referred to Heckman & Thompson (2016); Zhang (2018); Rupke (2018) for recent reviews of galactic wind models and observations.…”

mentioning

confidence: 99%

On the dynamics and survival of fractal clouds in galactic winds

Banda-Barragán

Zertuche

Federrath

et al. 2019

Monthly Notices of the Royal Astronomical Society

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Recent observations suggest that dense gas clouds can survive even in hot galactic winds. Here we show that the inclusion of turbulent densities with different statistical properties has significant effects on the evolution of wind-swept clouds. We investigate how the initial standard deviation of the log-normal density field influences the dynamics of quasi-isothermal clouds embedded in supersonic winds. We compare uniform, fractal solenoidal, and fractal compressive cloud models in both 3D and 2D hydrodynamical simulations. We find that the processes of cloud disruption and dense gas entrainment are functions of the initial density distribution in the cloud. Fractal clouds accelerate, mix, and are disrupted earlier than uniform clouds. Within the fractal cloud sample, compressive clouds retain high-density nuclei, so they are more confined, less accelerated, and have lower velocity dispersions than their solenoidal counterparts. Compressive clouds are also less prone to Kelvin-Helmholtz and Rayleigh-Taylor instabilities, so they survive longer than solenoidal clouds. By comparing the cloud properties at the destruction time, we find that dense gas entrainment is more effective in uniform clouds than in either of the fractal clouds, and it is more effective in solenoidal than in compressive models. In contrast, mass loading into the wind is more efficient in compressive cloud models than in uniform or solenoidal models. Overall, wide density distributions lead to inefficient entrainment, but they facilitate mass loading and favour the survival of very dense gas in hot galactic winds.

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mentioning

confidence: 99%

On the dynamics and survival of fractal clouds in galactic winds

Banda-Barragán

Zertuche

Federrath

et al. 2019

Monthly Notices of the Royal Astronomical Society

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A Brief Galactic Winds and the Role Played by Massive Stars

Cited by 1 publication

References 69 publications

On the dynamics and survival of fractal clouds in galactic winds

On the dynamics and survival of fractal clouds in galactic winds

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