Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...137..133s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 137, no. 1, Aug. 1984, p. 133-137.
Astronomy and Astrophysics
Astrophysics
10
Astronomical Spectroscopy, Interstellar Matter, Molecular Clouds, Spectral Line Width, Turbulence Effects, Fourier Transformation, Power Spectra, Stellar Evolution
Scientific paper
New ways to study the fluctuations (turbulence) in molecular clouds have been explored. The author studied the fluctuations within a single cloud. Further, he has analysed fluctuations in intensity and velocity in addition to the line width commonly used. Additionally, he made a strict separation between different molecules (isotopes) thus analysing each line parameter from each molecule separately. Ambiguities in the spatial definition were eliminated by working in Fourier transform space. The following tentative results were derived: The spectrum of fluctuations is similar to that predicted by the Kolmogorov relation. It is found, contrary to previous results, that the column density increases with increasing size. The smallest thermal fluctuations may be controlled by the mean free path of the 12CO photons.
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