ISO-LWS detection of the 112 micron HD J=1-0 line toward the Orion Bar

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dc.creatorWright, Christopher M.
dc.creatorvan Dishoeck, Ewine F.
dc.creatorCox, Pierre
dc.creatorSidher, Sunil D.
dc.creatorKessler, Martin F.
dc.date1999-01-28
dc.date.accessioned2026-07-07T02:30:13Z
dc.date.available2026-07-07T02:30:13Z
dc.descriptionWe 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.
dc.description18 pages including 1 figure, accepted for publication in Astrophysical Journal Letters
dc.identifierhttps://arxiv.org/abs/astro-ph/9901391
dc.identifierhttp://arxiv.org/abs/astro-ph/9901391
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13749
dc.subjectAstrophysics
dc.titleISO-LWS detection of the 112 micron HD J=1-0 line toward the Orion Bar
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