A power spectrum description of galactic neutral hydrogen

Details A power spectrum description of galactic neutral hydrogen A power spectrum description of galactic neutral hydrogen

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.216..201g&link_type=abstract

Astrophysics and Space Science, vol. 216, no. 1-2, p. 201-205

Astronomy and Astrophysics

Astronomy

2

Emission Spectra, H I Regions, Hydrogen, Interstellar Matter, Neutral Atoms, Power Spectra, Radio Astronomy, Radio Spectra, Spectrum Analysis, Astronomical Spectroscopy, Power Series

Scientific paper

Angular power spectra for neutral hydrogen towards l = 140 deg, b = 0 deg on scales from approximately equals 1 deg to 1/10 deg are presented. The spectra are generally well fitted by a power-law dependence on radius in the uv-plane, with an index between approximately equals -2.2 and approximately equals -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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