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The ALMA-PILS surve...
The ALMA-PILS survey: First detection of nitrous acid (HONO) in the interstellar medium
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- Coutens, A. (author)
- Université de Bordeaux,University of Bordeaux
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- Ligterink, N. F W (author)
- Universität Bern,University of Bern
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- Loison, J. C. (author)
- Université de Bordeaux,University of Bordeaux
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- Wakelam, V. (author)
- Université de Bordeaux,University of Bordeaux
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- Calcutt, Hannah, 1988 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Drozdovskaya, M. N. (author)
- Universität Bern,University of Bern
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- Jørgensen, Jes K. (author)
- Köpenhamns universitet,University of Copenhagen
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- Müller, H. S.P. (author)
- Universität zu Köln,University of Cologne
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- van Dishoeck, E. F. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),Universiteit Leiden (UL),Leiden University (UL)
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- Wampfler, S. F. (author)
- Universität Bern,University of Bern
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(creator_code:org_t)
- 2019-03-25
- 2019
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 623
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Abstract
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- Nitrogen oxides are thought to play a significant role as a nitrogen reservoir and to potentially participate in the formation of more complex species. Until now, only NO, NO, and HNO have been detected in the interstellar medium. We report the first interstellar detection of nitrous acid (HONO). Twelve lines were identified towards component B of the low-mass protostellar binary IRAS 16293-2422 with the Atacama Large Millimeter/submillimeter Array, at the position where NO and NO have previously been seen. A local thermodynamic equilibrium model was used to derive the column density (∼9 × 1014 cm in a 0 .″5 beam) and excitation temperature (∼100 K) of this molecule. HNO, NO, NO+, and HNO3 were also searched for in the data, but not detected. We simulated the HONO formation using an updated version of the chemical code Nautilus and compared the results with the observations. The chemical model is able to reproduce satisfactorily the HONO, NO, and NO abundances, but not the NO, HNO, and NHOH abundances. This could be due to some thermal desorption mechanisms being destructive and therefore limiting the amount of HNO and NHOH present in the gas phase. Other options are UV photodestruction of these species in ices or missing reactions potentially relevant at protostellar temperatures.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Kemi -- Annan kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Other Chemistry Topics (hsv//eng)
Keyword
- ISM
- Astrochemistry
- formation
- Stars
- molecules
- protostars
- Stars
- IRAS 16293-2422
- ISM
- individual objects
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Coutens, A.
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Ligterink, N. F ...
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Loison, J. C.
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Wakelam, V.
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Calcutt, Hannah, ...
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Drozdovskaya, M. ...
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show more...
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Jørgensen, Jes K ...
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Müller, H. S.P.
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van Dishoeck, E. ...
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Wampfler, S. F.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Other Chemistry ...
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Astronomy and As ...
- By the university
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Chalmers University of Technology