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Spatially resolved images of reactive ions in the Orion Bar
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- Goicoechea, J. R. (author)
- CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)
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- Cuadrado, S. (author)
- CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)
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- Pety, J. (author)
- Sorbonne Université,Sorbonne University,Institut de Radioastronomie Millimétrique (IRAM)
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- (creator_code:org_t)
- 2017-05-24
- 2017
- English.
- In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 601, s. Article Number: L9, pp. 1-9
- Journal article (peer-reviewed)
Abstract
Subject headings
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- We report high angular resolution (4.9" X 3.0") images of reactive ions SH+, HOC+, and SO+ toward the Orion Bar photodissociation region (PDR). We used ALMA-ACA to map several rotational lines at 0.8 mm, complemented with multi-line observations obtained with the IRAM 30m telescope. The SH+ and HOC+ emission is restricted to a narrow layer of 2" - to 10" -width (approximate to 800 to 4000AU depending on the assumed PDR geometry) that follows the vibrationally excited H-2(*) emission. Both ions efficiently form very close to the H/H-2 transition zone, at a depth of AV less than or similar to 1 mag into the neutral cloud, where abundant C+, S+, and H-2(*) coexist. SO+ peaks slightly deeper into the cloud. The observed ions have low rotational temperatures (T-rot approximate to 10-30K
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- (ISM:) photon-dominated region (PDR)
- line: identification
- ISM: clouds
- astrochemistry
Publication and Content Type
- art (subject category)
- ref (subject category)
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- Chapillon, E.
- Fuente, A.
- Gerin, M.
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- Chalmers University of Technology
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