A POWER SPECTRUM ANALYSIS OF THE ANGULAR SCALE OF GALACTIC NEUTRAL HYDROGEN EMISSION TOWARDS L = 140-DEGREES, B = 0-DEGREES

Angular power spectra are derived from the DRAO Galactic Plane Survey for H i emission with velocities between almost-equal-to 0 and almost-equal-to -95 km s-1 with respect to the Local Standard of Rest. The angular scales range from almost-equal-to 1-degrees to almost-equal-to 0-degrees.1 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 almost-equal-to -2.2 and almost-equal-to -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.