Non-Axisymmetric Line-Driven Disc Winds II - Full Velocity Gradient

Document Type

Article

Publication Date

5-15-2018

Publication Title

Monthly Notices of the Royal Astronomical Society

Volume

478

Issue

4

First page number:

5006

Last page number:

5016

Abstract

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.

Keywords

Galaxies: active; Hydrodynamics; Methods: numerical; Outflows; Stars: winds; X-rays: binaries

Disciplines

Astrophysics and Astronomy

Language

English

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