Submillimeter Wave Astronomy Satellite observations of extended water emission in Orion
| Autor: | Snell, R. L., Howe, J. E., Ashby, M. L. N., Bergin, E. A., Chin, G., Erickson, N. R., Goldsmith, P. F., Harwit, M., Kleiner, S. C., Koch, D. G., Neufeld, D. A., Patten, B. M., Rene Plume, Schieder, R., Stauffer, J. R., Tolls, V., Wang, Z., Winnewisser, G., Zhang, Y. F., Melnick, G. J. |
|---|---|
| Předmět: | |
| Zdroj: | Scopus-Elsevier |
| Popis: | We have used the Submillimeter Wave Astronomy Satellite to map the ground-state 1_{10}-1_{01} transition of ortho-water at 557 GHz in the Orion molecular cloud. Water emission was detected in Orion over an angular extent of about 20 arcmin, or nearly 3 pc. The water emission is relatively weak, with line widths (3-6 km s^{-1}) and V_{LSR} velocities (9-11 km s^{-1}) consistent with an origin in the cold gas of the molecular ridge. We find that the ortho-water abundance relative to H_2 in the extended gas in Orion varies between 1 and 8x10^{-8}, with an average of 3x10^{-8}. The absence of detectable narrow-line ortho-H_2^{18}O emission is used to set a 3-sigma upper limit on the relative ortho-water abundance of 7x10^{-8}. Comment: 4 pages, 2 Postscript figures, uses aastex.cls, emulateapj5.sty (included), and apjfonts.sty (included) |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|