A model for line absorption and emission from turbulent mixing layers

ABSTRACT Turbulent mixing layers (TMLs) are ubiquitous in multiphase gas. They can potentially explain observations of high ions such as O vi, which have significant observed column densities despite short cooling times. Previously, we showed that global mass, momentum, and energy transfer between p...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2021-11, Vol.508 (1), p.L37-L42
Hauptverfasser: Tan, Brent, Oh, S Peng
Format: Artikel
Sprache:eng
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Zusammenfassung:ABSTRACT Turbulent mixing layers (TMLs) are ubiquitous in multiphase gas. They can potentially explain observations of high ions such as O vi, which have significant observed column densities despite short cooling times. Previously, we showed that global mass, momentum, and energy transfer between phases mediated by TMLs is not sensitive to details of thermal conduction or numerical resolution. By contrast, we show here that observables such as temperature distributions, column densities, and line ratios are sensitive to such considerations. We explain the reason for this difference. We develop a prescription for applying a simple 1D conductive-cooling front model which quantitatively reproduces 3D hydrodynamic simulation results for column densities and line ratios, even when the TML has a complex fractal structure. This enables subgrid absorption and emission line predictions in large scale simulations. The predicted line ratios are in good agreement with observations, while observed column densities require numerous mixing layers to be pierced along a line of sight.
ISSN:1745-3925
0035-8711
1745-3933
1365-2966
DOI:10.1093/mnrasl/slab100