Analysis of galaxy neutral hydrogen spectra

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Galactic Radiation, Galactic Structure, H Lines, Line Shape, Neutral Gases, Autocorrelation, Line Spectra, Molecular Rotation

Scientific paper

The 21 cm spatially integrated neutral hydrogen line profile observed in nearby galaxies contains significant information about the distribution of neutral hydrogen. It is shown, for a standard model of galactic structure (azimuthally symmetric, thin disk), that the neutral hydrogen distribution as a function of rotation velocity can be calculated directly from either the spectral line shape or the corresponding autocorrelation function.

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