Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...255..160w&link_type=abstract
Astrophysical Journal, Part 1, vol. 255, Apr. 1, 1982, p. 165-175. Research supported by the Robert A. Welch Foundation
Astronomy and Astrophysics
Astrophysics
90
Astronomical Models, Deuterium Compounds, Emission Spectra, Interstellar Matter, Line Spectra, Molecular Clouds, Abundance, Carbon Monoxide, Formic Acid, Interstellar Chemistry, Positive Ions, Radiative Transfer, Reaction Kinetics, Temperature Dependence
Scientific paper
Observations of the J = 1-0 lines of HCO(+), (H-13)CO(+), and DCO(+) and of the J = 2-1 line of DCO(+) taken with similar beam sizes are used in constructing models of the DCO(+) emission regions in eleven molecular clouds. The densities and extents of the regions as determined from the DCO(+) observations are similar to the densities and extents of the same regions modeled on formaldehyde observations. The DCO(+)/(H-13)CO(+) abundance ratio ranges from 0.2 to 6 in this sample. The observations, interpreted in the light of newly measured reaction rates, constrain electron abundances in some regions to be very low, X(e) being less than 1 x 10 to the -7. Independent limits placed on X(e) using (C-13)O and (H-13)CO(+) observations yield more sensitive limits, X(e) being less than 6 x 10 to the -8. It is found that carbon monoxide abundance limits are consistent with those found at the edges of dark clouds.
Loren Robert B.
Snell Ronald L.
Wootten Al
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