Physical conditions in shocked regions of Orion from ground-based observations of H_2O

Details Physical conditions in shocked regions of Orion from ground-based observations of H_2O Physical conditions in shocked regions of Orion from ground-based observations of H_2O

1999-06-02

arxiv.org/abs/astro-ph/9906037v1

Astronomy and Astrophysics

Astrophysics

4 figures

Scientific paper

10.1086/312164

We present observations of the 5$_{1,5}\to4_{2,2}$ transition of water vapor at 325.15 GHz taken with the CSO telescope towards Orion IRc2. The emission is more extended than that of other molecular species such as CH$_3$OH. However, it is much less extended than the emission of water vapor at 183.31 GHz reported by Cernicharo et al (1994). A comparison of the line intensities at 325.15 GHz and 183.31 GHz puts useful constraints on the density and temperature of the emitting regions and allows an estimate of H_2O abundance, x(H_2O), of $\simeq10^{-4}$ in the Plateau and $\simeq10^{-6}-10^{-5}$ in the Ridge.

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