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Title:
Observations of anomalous intensities in the lines of the HCO/plus/ isotopes
Authors:
Langer, W. D.; Wilson, R. W.; Henry, P. S.; Guelin, M.
Affiliation:
AA(Massachusetts, University, Amherst, Mass.; Bell Telephone Laboratories, Inc., Holmdel, N.J.), AB(Bell Telephone Laboratories, Inc., Holmdel, N.J.), AC(Bell Telephone Laboratories, Inc., Holmdel, N.J.)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 225, Nov. 1, 1978, p. L139-L142. (ApJ Homepage)
Publication Date:
11/1978
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
ABUNDANCE, INTERSTELLAR CHEMISTRY, INTERSTELLAR GAS, LUMINOUS INTENSITY, MOLECULAR SPECTRA, DIPOLE MOMENTS, FORMALDEHYDE, LINE SPECTRA, MOLECULAR EXCITATION, MOLECULAR ROTATION
Comment:
A&AA ID. AAA022.131.106
DOI:
10.1086/182812
Bibliographic Code:
1978ApJ...225L.139L

Abstract

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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