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HERSCHEL OBSERVATIO...
HERSCHEL OBSERVATIONS OF INTERSTELLAR CHLORONIUM
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- Neufeld, David A. (author)
- Johns Hopkins University
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- Roueff, Evelyne (author)
- Observatoire de Paris-Meudon
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- Snell, Ronald L. (author)
- University of Massachusetts
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- Lis, Dariusz (author)
- California Institute of Technology (Caltech)
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- Benz, Arnold O. (author)
- Eidgenössische Technische Hochschule Zürich (ETH),Swiss Federal Institute of Technology in Zürich (ETH)
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- Bruderer, Simon (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Black, John H, 1949 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- De Luca, Massimo (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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- Gerin, Maryvonne (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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Goldsmith, Paul F. (author)
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Gupta, Harshal (author)
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- Indriolo, Nick (author)
- Johns Hopkins University
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- Le Bourlot, Jacques (author)
- Observatoire de Paris-Meudon
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- Le Petit, Franck (author)
- Observatoire de Paris-Meudon
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- Larsson, Bengt, 1943 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Melnick, Gary J. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Menten, Karl M. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Monje, Raquel, 1979 (author)
- California Institute of Technology (Caltech)
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- Nagy, Zsofia (author)
- Rijksuniversiteit Groningen,University of Groningen
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- Phillips, Thomas G. (author)
- California Institute of Technology (Caltech)
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- Sandqvist, Aage (author)
- Stockholms universitet,Institutionen för astronomi
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- Sonnentrucker, Paule (author)
- Space Telescope Science Institute (STScI)
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- van der Tak, Floris (author)
- Netherlands Institute for Space Research (SRON),Rijksuniversiteit Groningen,University of Groningen
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- Wolfire, Mark G. (author)
- University of Maryland
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(creator_code:org_t)
- 2012
- 2012
- English.
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In: Astrophysical Journal. - 0004-637X .- 1538-4357. ; 748:1, s. 37-
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Using the Herschel Space Observatory's Heterodyne Instrument for the Far-Infrared, we have observed parachloronium (H2Cl+) toward six sources in the Galaxy. We detected interstellar chloronium absorption in foreground molecular clouds along the sight lines to the bright submillimeter continuum sources Sgr A (+50 km s(-1) cloud) and W31C. Both the para-(H2Cl+)-Cl-35 and para-(H2Cl+)-Cl-37 isotopologues were detected, through observations of their 1(11)-0(00) transitions at rest frequencies of 485.42 and 484.23 GHz, respectively. For an assumed ortho-to-para ratio (OPR) of 3, the observed optical depths imply that chloronium accounts for similar to 4%-12% of chlorine nuclei in the gas phase. We detected interstellar chloronium emission from two sources in the Orion Molecular Cloud 1: the Orion Bar photodissociation region and the Orion South condensation. For an assumed OPR of 3 for chloronium, the observed emission line fluxes imply total beam-averaged column densities of similar to 2 x 10(13) cm(-2) and similar to 1.2 x 10(13) cm(-2), respectively, for chloronium in these two sources. We obtained upper limits on the para-(H2Cl+)-Cl-35 line strengths toward H-2 Peak 1 in the Orion Molecular cloud and toward the massive young star AFGL 2591. The chloronium abundances inferred in this study are typically at least a factor similar to 10 larger than the predictions of steady-state theoretical models for the chemistry of interstellar molecules containing chlorine. Several explanations for this discrepancy were investigated, but none has proven satisfactory, and thus the large observed abundances of chloronium remain puzzling.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- ISM: molecules
- molecular processes
- submillimeter: ISM
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Neufeld, David A ...
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Roueff, Evelyne
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Snell, Ronald L.
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Lis, Dariusz
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Benz, Arnold O.
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Bruderer, Simon
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show more...
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Black, John H, 1 ...
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De Luca, Massimo
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Gerin, Maryvonne
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Goldsmith, Paul ...
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Gupta, Harshal
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Indriolo, Nick
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Le Bourlot, Jacq ...
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Le Petit, Franck
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Larsson, Bengt, ...
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Melnick, Gary J.
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Menten, Karl M.
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Monje, Raquel, 1 ...
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Nagy, Zsofia
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Phillips, Thomas ...
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Sandqvist, Aage
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Sonnentrucker, P ...
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van der Tak, Flo ...
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Wolfire, Mark G.
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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 ...
- Articles in the publication
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Astrophysical Jo ...
- By the university
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Stockholm University
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Chalmers University of Technology