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27 April 2024 |
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ISO-LWS detection of the 112 micron HD J=1-0 line toward the Orion Bar | | Christopher M. Wright
; Ewine F. van Dishoeck
; Pierre Cox
; Sunil D. Sidher
; Martin F. Kessler
; | | Date: |
28 Dec 1998 | | Subject: | astro-ph | | Affiliation: | 1 and 5), Ewine F. van Dishoeck , Pierre Cox , Sunil D. Sidher and Martin F. Kessler ( Leiden Observatory, The Netherlands, Institut d’Astrophysique Spatiale, France, Rutherford Appleton Laboratory, UK, ISO Science Operations Centre, Spain, | | Abstract: | We report the first detection outside of the solar system of the lowest pure rotational J=1-0 transition of the HD molecule at 112 microns. The detection was made toward the Orion Bar using the Fabry-Perot of the Long Wavelength Spectrometer (LWS) on board the Infrared Space Observatory (ISO). The line appears in emission with an integrated flux of (0.93+/-0.17)e-19 Watts per cm squared in the LWS beam, implying a beam-averaged column density in the v=0, J=1 state of (1.2+/-0.2)e17 molecules per cm squared. Assuming LTE excitation, the total HD column density is (2.9+/-0.8)e17 molecules per cm squared for temperatures between 85 and 300 K. Combined with the total warm molecular hydrogen (H2) column density of about (1.5-3.0)e22 molecules per cm squared derived from either the H2 pure rotational lines, C18O observations or dust continuum emission, the implied HD abundance, HD/H2, ranges from 0.7e-5 to 2.6e-5, with a preferred value of (2.0+/-0.6)e-5. The corresponding deuterium abundance of [D]/[H]=(1.0+/-0.3)e-5 is compared with recent values derived from ultraviolet absorption line observations of atomic HI and DI in interstellar clouds in the solar neighborhood and in Orion. | | Source: | arXiv, astro-ph/9901391 | | Services: | Forum | Review | PDF | Favorites | |
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