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- W4297834142 abstract "Vorticity is central to the nature of, and dynamical processes in turbulence, including turbulence in astrophysical fluids. The results of cite{Raymond20a,Raymond20b} on vorticity in the post-shock fluid of the Cygnus Loop supernova remnant are therefore of great interest. We consider the degree to which spectroscopic measurements of an optically-thin line, the most common type of astronomical velocimetry, can yield unambiguous measurements of the vorticity in a fluid. We consider an ideal case of observations in the plane of a flow which may or may not contain vorticity. In one case, the flow possesses vorticity in a direction perpendicular to the plane of observations. In the other case, the flow is irrotational (zero vorticity) by construction. The observationally-deduced vorticity (referred to as the {em pseudovorticity}) is inferred from spatial differences in the line-of-sight component of velocity, and assumptions of symmetry. My principal result is that in the case of the vortical flow, the pseudovorticity is a reasonable match for the true vorticity. However, and importantly, the pseudovorticity in the case of the irrotational flow field is also nonzero, and comparable in magnitude to that for a vortical flow. The conclusion of this paper is that while astronomical spectroscopic observations may yield a good estimate of the vorticity in a remote fluid, the robustness of such an inference cannot be insured." @default.
- W4297834142 created "2022-10-01" @default.
- W4297834142 creator A5081711534 @default.
- W4297834142 date "2022-09-14" @default.
- W4297834142 modified "2023-09-27" @default.
- W4297834142 title "On the Measurement of Vorticity in Astrophysical Fluids" @default.
- W4297834142 doi "https://doi.org/10.48550/arxiv.2209.06707" @default.
- W4297834142 hasPublicationYear "2022" @default.
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