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Turbulent mixing layers (TMLs) are ubiquitous in multiphase gas. They canpotentially explain observations of high ions such as O VI, which havesignificant observed column densities despite short cooling times. Previously,we showed that global mass, momentum and energy transfer between phasesmediated by TMLs is not sensitive to details of thermal conduction or numericalresolution. By contrast, we show here that observables such as temperaturedistributions, column densities and line ratios are sensitive to suchconsiderations. We explain the reason for this difference. We develop aprescription for applying a simple 1D conductive-cooling front model whichquantitatively reproduces 3D hydrodynamic simulation results for columndensities and line ratios, even when the TML has a complex fractal structure.This enables sub-grid absorption and emission line predictions in large scalesimulations. The predicted line ratios are in good agreement with observations,while observed column densities require numerous mixing layers to be piercedalong a line of sight.

A Model for Line Absorption and Emission from Turbulent Mixing Layers