Observations of anomalous intensities in the lines of the HCO/plus/ isotopes

Details Observations of anomalous intensities in the lines of the HCO/plus/ isotopes Observations of anomalous intensities in the lines of the HCO/plus/ isotopes

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225l.139l&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 225, Nov. 1, 1978, p. L139-L142.

Other

77

Abundance, Interstellar Chemistry, Interstellar Gas, Luminous Intensity, Molecular Spectra, Dipole Moments, Formaldehyde, Line Spectra, Molecular Excitation, Molecular Rotation

Scientific paper

The J equals 1-0 rotational line of H(C-13)O(plus) has been detected in the dark clouds L134N and Taurus Molecular Cloud 1 (TMC-1) and found to have, at selected positions, an intensity about twice that of the common isotope. The corresponding HC(O-18)(plus) observations, however, yield a normal H(C-13)O(plus)/HC(O-18)(plus) isotope ratio. It is suggested that low-excitation foreground material is absorbing the HCO(plus) emission. The presence of this cold material must also affect the lines of other abundant molecules with large dipole moments, such as HCN, H2CO, and CS; these lines should be used cautiously as probes of the high-density dark clouds, and the less abundant isotopic species should be observed to check for opacity effects.

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