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={Astrophysical Journal},
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. JO - Astrophysical Journal VL - 225 SP - L139 EP - L142 DO - 10.1086/182812 ER -
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