Statistics – Computation
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321..877c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 321, Oct. 15, 1987, p. 877-883.
Statistics
Computation
10
Carbon Monoxide, Interstellar Matter, Molecular Flow, Radiative Transfer, Radio Sources (Astronomy), Stellar Evolution, Computational Astrophysics, Magnetohydrodynamic Waves, Stellar Winds, Temperature Dependence, Temperature Gradients
Scientific paper
The paper examines previous findings that the derived filling factors in the calculations of high-velocity molecular flow parameters are less than unity, thus indicating that these flows are clumpy. Here, the relative line intensities of the low rotational transitions of (C-12)O and (C-13)O molecules were calculated for regions with temperature gradients and were found to be very different from those expected from an isothermal region at any temperature. The standard procedure used in the analysis of CO data under assumption of uniform temperature was then applied to the results of the calculations with a temperature gradient. It was found that the deduced filling factors were less (or greater) than unity if the temperature increased (decreased) toward the center of the molecular cloud. It is concluded that the deduced filling factors (and, thus, the clumpiness) are an artifact of the assumption of uniform temperature adopted in the data analysis.
Anglada Guillem
Cantó Jorge
Rodriguez Luis F.
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