Publication Abstracts
Waters et al. 1980
Waters, J.W., J.J. Gustincic, R.K. Kakar, T.B.H. Kuiper, H.K. Roscoe, P.N. Swanson, E.N. Rodriguez Kuiper, A.R. Kerr, and P. Thaddeus, 1980: Observations of interstellar H2O emission at 183 gigahertz. Astrophys. J., 235, 57-62, doi:10.1086/157609.
Line emission at 183 GHz by the 313-220 rotational transition of water vapor has been detected from the Orion Nebula with the NASA Kuiper Airborne Observatory 91 cm telescope. The peak antenna temperature of the line is 15 K, its LSR velocity is 8 km/s, and its width is 15 km/s. The velocity profile has characteristics similar to those for CO: a narrow (∼4 km/s) "spike" centered at 9.5 km/s and a broad "plateau" with flaring wings centered at ∼18 km/s. Our 7 ∼5 antenna beam did not resolve the source. The 183 GHz H2O plateau emission appears enhanced above that expected for thermal excitation if it originates from the no greater than 1' region characteristic of plateau emission from all other observed molecules. The spike emission is consistent with an optically thick source of the approximate size of the well-known molecular ridge in Orion having the H2O in thermal equilibrium at T — 50 K. If this is the case, then the H2O column density giving rise to the spike is NH2O ≥ 3×1017 cm-2. An excitation calculation implies NH2O — 1018 cm-2 for a source the size of the molecular ridge. These results imply that H2O is one of the more abundant species in the Orion Molecular Cloud.
H2O emission at 183 GHzwas not detected in Sgr A, Sgr B2, W3, W43, W49, W51, DR 21, NGC 1333, NGC 7027, GL 2591, or the ρ Oph cloud; it may have been detected in M17.
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BibTeX Citation
@article{wa00300h,
author={Waters, J. W. and Gustincic, J. J. and Kakar, R. K. and Kuiper, T. B. H. and Roscoe, H. K. and Swanson, P. N. and Rodriguez Kuiper, E. N. and Kerr, A. R. and Thaddeus, P.},
title={Observations of interstellar H2O emission at 183 gigahertz},
year={1980},
journal={Astrophysical Journal},
volume={235},
pages={57--62},
doi={10.1086/157609},
}
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RIS Citation
TY - JOUR ID - wa00300h AU - Waters, J. W. AU - Gustincic, J. J. AU - Kakar, R. K. AU - Kuiper, T. B. H. AU - Roscoe, H. K. AU - Swanson, P. N. AU - Rodriguez Kuiper, E. N. AU - Kerr, A. R. AU - Thaddeus, P. PY - 1980 TI - Observations of interstellar H2O emission at 183 gigahertz JA - Astrophys. J. JO - Astrophysical Journal VL - 235 SP - 57 EP - 62 DO - 10.1086/157609 ER -
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