Ground-based detection of a vibration-rotation line of HD in Orion

Content Provider	Semantic Scholar
Author	Geballe, Thomas R. Howat, S. K. Ramsay Timmermann, Ralf Bertoldi, F. De Mountain, Courtney M.
Copyright Year	2001
Abstract	The v = 1{0 R(5) line of HD at 2.46 m has been detected at the position of brightest line emission of shocked H2 in the Orion Molecular Cloud. The ux in this HD line, when compared to that of the previously detected HD 0{0 R(5) line at 112 m, suggests that, like the v=1 levels of H2, the v=1 levels of HD are populated in LTE, despite their much higher rates of spontaneous emission compared to H2. The higher than expected population of vibrationally excited HD may be due to chemical coupling of HD to H2 via the reactive collisions HD + H$ H2 + D in the shocked gas. The deuterium abundance implied by the strengths of these lines relative to those of H2 is (5.1 1.9) 10 . Corresponding author. Gemini Observatory, Hilo, HI 96720, USA. Tel. +1-808-974-2519; fax +1-808-935-9650 Email address: tgeballe@gemini.edu; fax: 1-808-935-9650 (T. R. Geballe) To be published in a special issue of Planetary and Space Science: Proceedings of the conference, "Deuterium in the Universe," held at Meudon Observatory, 25-27 June 2001
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://cds.cern.ch/record/535741/files/0201418.pdf
Alternate Webpage(s)	http://arxiv.org/pdf/astro-ph/0201418v1.pdf
Alternate Webpage(s)	http://www.gemini.edu/documentation/webdocs/preprints/gpre81.pdf
Language	English
Access Restriction	Open
Subject Keyword	Clusia sp. JA 3588 Compaq LTE Deuterium Email Fax Histamine H2 Antagonists Huntington Disease Like button Planetary scanner Population RLN2 gene Scientific Publication Shock Spontaneous order collision
Content Type	Text
Resource Type	Article