Publication Abstracts

Langer et al. 1978

Langer, W.D., R.W. Wilson, P.S. Henry, and M. Guelin, 1978: Observations of anomalous intensities in the lines of the HCO+ isotopes. Astrophys. J., 225, L139-L142, doi:10.1086/182812.

The J equals 1-0 rotational line of H13CO+ 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 HC18O+ observations, however, yield a normal H13CO+/HC18O+ isotope ratio. We suggest that low-excitation foreground material is absorbing the HCO+ 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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BibTeX Citation

@article{la05200y,
  author={Langer, W. D. and Wilson, R. W. and Henry, P. S. and Guelin, M.},
  title={Observations of anomalous intensities in the lines of the HCO+ isotopes},
  year={1978},
  journal={Astrophys. J.},
  volume={225},
  pages={L139--L142},
  doi={10.1086/182812},
}

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RIS Citation

TY  - JOUR
ID  - la05200y
AU  - Langer, W. D.
AU  - Wilson, R. W.
AU  - Henry, P. S.
AU  - Guelin, M.
PY  - 1978
TI  - Observations of anomalous intensities in the lines of the HCO+ isotopes
JA  - Astrophys. J.
VL  - 225
SP  - L139
EP  - L142
DO  - 10.1086/182812
ER  -

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