A power spectrum analysis of the angular scale of Galactic neutral hydrogen emission towards L = 140 deg, B = 0 deg
Abstract
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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- May 1993
- DOI:
- 10.1093/mnras/262.2.327
- Bibcode:
- 1993MNRAS.262..327G
- Keywords:
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- Emission Spectra;
- H I Regions;
- Interstellar Matter;
- Power Spectra;
- Spectrum Analysis;
- Milky Way Galaxy;
- Radio Astronomy;
- Astrophysics