Abstract
Angular power spectra for neutral hydrogen towardsl = 140°,b = 0° on scales from ≈ 1° to 1/10° are presented. The spectra are generally well fitted by a power-law dependence on radius in theuv-plane, with an index between ≈ -2.2 and ≈ -3.0. The more distant hydrogen, which corresponds to larger physical scales, tends to have a more negative index than does the nearer material. There is no preferred angular scale apparent at any velocity. For the distant hydrogen there is no obvious difference between the slope of power spectra for emission aligned perpendicular compared with that parallel to the Galactic plane.
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Green, D.A. A power spectrum description of Galactic neutral hydrogen. Astrophys Space Sci 216, 201–205 (1994). https://doi.org/10.1007/BF00982494
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DOI: https://doi.org/10.1007/BF00982494