On the dynamics and survival of fractal clouds in galactic winds

@article{BandaBarragn2019OnTD,
title={On the dynamics and survival of fractal clouds in galactic winds},
author={W E Banda-Barrag{\'a}n and Federico Zertuche and Christoph Federrath and J Garc{\'i}a Del Valle and Marcus Br{\"u}ggen and Alexander Y. Wagner},
journal={Monthly Notices of the Royal Astronomical Society},
year={2019}
}
• Published 21 January 2019
• Physics, Environmental Science
• Monthly Notices of the Royal Astronomical Society
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 lognormal 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…

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References

SHOWING 1-10 OF 115 REFERENCES
Starburst-Driven Galactic Winds: Filament Formation and Emission Processes
• Physics, Environmental Science
• 2009
We have performed a series of three-dimensional simulations of the interaction of a supersonic wind with a nonspherical radiative cloud. These simulations are motivated by our recent
The Launching of Cold Clouds by Galaxy Outflows I: Hydrodynamic Interactions with Radiative Cooling
• Physics, Environmental Science
• 2015
To better understand the nature of the multiphase material found in outflowing galaxies, we study the evolution of cold clouds embedded in flows of hot and fast material. Using a suite of
The dynamics and high-energy emission of conductive gas clouds in supernova-driven galactic superwinds
• Physics, Environmental Science
• 2005
Superwinds from starburst galaxies are multiphase outflows that sweep up and incorporate ambient galactic disc and halo gas. The interaction of this denser material with the more diffuse hot wind gas
The Launching of Cold Clouds by Galaxy Outflows II: The Role of Thermal Conduction
• Physics
• 2016
We explore the impact of electron thermal conduction on the evolution of radiatively-cooled cold clouds embedded in flows of hot and fast material, as occur in outflowing galaxies. Performing a
Magnetized gas clouds can survive acceleration by a hot wind
• Physics
• 2015
We present three-dimensional magnetohydrodynamic simulations of magnetized gas clouds accelerated by hot winds. We initialize gas clouds with tangled internal magnetic fields and show that this field
Filament formation in wind–cloud interactions– II. Clouds with turbulent density, velocity, and magnetic fields
• Physics
• 2018
We present a set of numerical experiments designed to systematically investigate how turbulence and magnetic fields influence the morphology, energetics, and dynamics of filaments produced in
Filament formation in wind–cloud interactions – I. Spherical clouds in uniform magnetic fields
• Physics
• 2016
Filamentary structures are ubiquitous in the interstellar medium, yet their formation, internal structure, and longevity have not been studied in detail. We report the results from a comprehensive
The physics of multiphase gas flows: fragmentation of a radiatively cooling gas cloud in a hot wind
• Physics, Environmental Science
Monthly Notices of the Royal Astronomical Society
• 2018
Galactic winds exhibit a multiphase structure that consists of hot-diffuse and cold-dense phases. Here we present high-resolution idealised simulations of the interaction of a hot supersonic wind
SIMULATIONS OF HIGH-VELOCITY CLOUDS. I. HYDRODYNAMICS AND HIGH-VELOCITY HIGH IONS
• Physics, Environmental Science
• 2011
We present hydrodynamic simulations of high-velocity clouds (HVCs) traveling through the hot, tenuous medium in the Galactic halo. A suite of models was created using the FLASH hydrodynamics code,
Shock-triggered formation of magnetically-dominated clouds
• Physics
• 2007
Aims. Our aim is to understand the formation of a magnetically dominated molecular cloud out of an atomic cloud. Methods. A thermally stable warm atomic cloud is initially in static equilibrium with