Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....35..177r&link_type=abstract
Astronomy and Astrophysics, vol. 35, no. 2, Oct. 1974, p. 177-190.
Astronomy and Astrophysics
Astrophysics
24
Density Distribution, Galactic Structure, Hydrogen Clouds, Interstellar Matter, Microwave Emission, Emission Spectra, Gas Density, Interstellar Gas, Spiral Galaxies, Velocity Distribution, Wave Propagation
Scientific paper
An operational definition for interstellar clouds is given which permits a separation of the 21-cm cloud radiation from that of the intercloud medium, called stratum here, to be made even for galactic plane regions. The cloud radiation includes the emission from the fluctuating part of the interstellar gas density field and variations of the line profiles produced by small scale velocity field fluctuations, while the stratum radiation contains the large scale density variation and all large scale velocity field effects. The velocity field therefore can be determined by investigating stratum line profiles. An explicit discussion of such an analysis is given.
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