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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents

ID: 11193.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
Ground-based detection of a vibration-rotation line of HD in Orion
Authors:Geballe, T. R.; Ramsay Howat, S. K.; Timmermann, R.; Bertoldi, F.; Mountain, C. M.
Date of Publication (YYYY-MM-DD):2002-10
Title of Journal:Planetary and Space Science
Journal Abbrev.:Planet Space Sci.
Issue / Number:12-13
Start Page:1185
End Page:1188
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:The nu = 1-0 R(5) line of HD at 2.46 mum has been detected at the position of brightest line emission of shocked H-2 in the Orion Molecular Cloud. The flux in this HD line, when compared to that of the previously detected HD 0-0 R(5) line at 19.43 mum, suggests that like the nu = 1 levels of H-2, the nu = 1 levels of HD are populated in LTE, despite their much higher rates of spontaneous emission compared to H-2. The higher than expected population of vibrationally excited HD may be due to chemical coupling of HD to H-2 via the reactive collisions HD + H reversible arrow H-2 + D in the shocked gas. The deuterium abundance implied by the strengths of these lines relative to those of H-2 is (5.1 +/- 1.9) x 10(-6). (C) 2002 Elsevier Science Ltd. All rights reserved.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:Gemini Observ, Hilo, HI 96720 USA; Gemini Observ, Hilo, HI 96720 USA; Royal Observ, Astron Technol Ctr, Edinburgh EH9 3HJ, Midlothian, Scotland; Univ Cologne, Inst Phys, D-50937 Cologne, Germany; Max Planck Inst Radioastron, D-53121 Bonn, Germany
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