Two-component structure in the profiles of high velocity clouds

Details Two-component structure in the profiles of high velocity clouds Two-component structure in the profiles of high velocity clouds

Apr 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....48...39c&link_type=abstract

Astronomy and Astrophysics, vol. 48, no. 1, Apr. 1976, p. 39-47.

Astronomy and Astrophysics

Astrophysics

47

Hydrogen Clouds, Interstellar Extinction, Interstellar Gas, Microwave Attenuation, Normal Density Functions, Velocity Distribution, Bandwidth, Data Reduction, Graphs (Charts), Tables (Data), Ultrahigh Frequencies, Ultraviolet Absorption

Scientific paper

Gaussian analysis of 21-cm profiles of high-velocity clouds reveals the existence of two well-defined components: one with mean velocity widths of about 7 km/s and the other with mean widths of about 23 km/s. These components are correlated with the morphological structure described by Giovanelli et al. (1973): small velocity-width components correlate with small bright condensations in the high-velocity complexes, while larger width components correlate with more extended faint regions. Because both components appear associated with distinct clouds, however, they are interpreted as representing two phases of a three phase galactic gas. Analogies with UV interstellar absorption and 21-cm line absorption observations are discussed.

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