Non-Axisymmetric Line Driven Disc Winds II – Full Velocity Gradient [HEAP]

We study non-axisymetric 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 $\sim 3$ from the azimuthal average, the magnitude of their velocity dispersion is comparable to the flow velocity and they produce $\sim 20\%$ 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 which enhances line broadening.

Read this paper on arXiv…

S. Dyda and D. Proga
Tue, 13 Feb 18

Comments: 12 pages, 9 figures, 2 tables