Non-Axisymmetric Line-Driven Disc Winds II - Full Velocity Gradient
Monthly Notices of the Royal Astronomical Society
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We study non-axisymmetric features of 3D line-driven winds in the Sobolev approximation, where the optical depth is calculated using the full velocity gradient. We find that non-axisymmetric density features, so-called clumps, form primarily at the base of the wind on super-Sobolev length-scales. The density of clumps differs by a factor of ∼3 from the azimuthal average, the magnitude of their velocity dispersion is comparable to the flow velocity, and they produce ∼20 per cent variations in the column density. Clumps may be observable because differences in density produce enhancements in emission and absorption profiles or through their velocity dispersion that enhances line broadening.
Galaxies: active; Hydrodynamics; Methods: numerical; Outflows; Stars: winds; X-rays: binaries
Astrophysics and Astronomy
Non-Axisymmetric Line-Driven Disc Winds II - Full Velocity Gradient.
Monthly Notices of the Royal Astronomical Society, 478(4),