A power spectrum analysis of the angular scale of Galactic neutral hydrogen emission towards L = 140 deg, B = 0 deg

Astronomy and Astrophysics – Astronomy

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Emission Spectra, H I Regions, Interstellar Matter, Power Spectra, Spectrum Analysis, Milky Way Galaxy, Radio Astronomy

Scientific paper

Angular power spectra are derived from the DRAO Galactic Plane Survey for H I emission with velocities between about 0 and -95 km/s with respect to the Local Standard of Rest. The angular scales range from about 1 deg to = 0.1 deg for the brightest emission in the Perseus arm. Generally the spectra are well fitted by a power-law dependence on radius in the uv-plane, with an index between -2.2 and -3.0. The more distant H I, which corresponds to large physical scales, tends to have a more negative index than the nearer H I. There is no preferred angular scale apparent at any velocity. These results provide a concise statistical description of H I in the outer Galaxy.

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