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25 April 2024 |
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SWAS and Arecibo observations of H2O and OH in a diffuse cloud along the line-of-sight to W51 | David A. Neufeld
; Michael J. Kaufman
; Paul F. Goldsmith
; David J. Hollenbach
; Rene Plume
; | Date: |
16 Jul 2002 | Journal: | Astrophys.J. 580 (2002) 278-284 | Subject: | astro-ph | Affiliation: | Johns Hopkins), Michael J. Kaufman (San Jose State), Paul F. Goldsmith (Cornell; NAIC), David J. Hollenbach (NASA-Ames) and Rene Plume (Calgary | Abstract: | Observations of W51 with the Submillimeter Wave Astronomy Satellite (SWAS) have yielded the first detection of water vapor in a diffuse molecular cloud. The water vapor lies in a foreground cloud that gives rise to an absorption feature at an LSR velocity of 6 km/s. The inferred H2O column density is 2.5E+13 cm-2. Observations with the Arecibo radio telescope of hydroxyl molecules at ten positions in W51 imply an OH column density of 8E+13 cm-2 in the same diffuse cloud. The observed H2O/OH ratio of ~ 0.3 is significantly larger than an upper limit derived previously from ultraviolet observations of the similar diffuse molecular cloud lying in front of HD 154368. The observed variation in H2O/OH likely points to the presence in one or both of these clouds of a warm (T > 400) gas component in which neutral-neutral reactions are important sources of OH and/or H2O. | Source: | arXiv, astro-ph/0207344 | Services: | Forum | Review | PDF | Favorites |
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