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First spectrally-re...
First spectrally-resolved H-2 observations towards HH 54 Low H2O abundance in shocks
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- Santangelo, G. (author)
- Osservatorio Astronomico di Roma,Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory
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- Antoniucci, S. (author)
- Osservatorio Astronomico di Roma
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- Nisini, B. (author)
- Osservatorio Astronomico di Roma
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- Codella, C. (author)
- Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory
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- Bjerkeli, Per, 1977 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Giannini, T. (author)
- Osservatorio Astronomico di Roma
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- Lorenzani, A. (author)
- Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory
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- Lundin, L. K. (author)
- European Southern Observatory (ESO)
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- Cabrit, S. (author)
- LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France
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Calzoletti, L. (author)
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- Liseau, René, 1949 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Neufeld, D. A. (author)
- Johns Hopkins University
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Tafalla, M. (author)
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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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(creator_code:org_t)
- 2014-10-02
- 2014
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 569, s. Art. no. L8-
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Abstract
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- Context. Herschel observations suggest that the H2O distribution in outflows from low-mass stars resembles the H-2 emission. It is still unclear which of the different excitation components that characterise the mid-and near-IR H-2 distribution is associated with H2O. Aims. The aim is to spectrally resolve the different excitation components observed in the H-2 emission. This will allow us to identify the H-2 counterpart associated with H2O and finally derive directly an H2O abundance estimate with respect to H-2. Methods. We present new high spectral resolution observations of H-2 0-0 S(4), 0-0 S(9), and 1-0 S(1) towards HH 54, a bright nearby shock region in the southern sky. In addition, new Herschel/HIFI H2O (2(12)-1(01)) observations at 1670 GHz are presented. Results. Our observations show for the first time a clear separation in velocity of the different H-2 lines: the 0-0 S(4) line at the lowest excitation peaks at -7 kms(-1), while the more excited 0-0 S(9) and 1-0 S(1) lines peak at -15 km s(-1). H2O and high-J CO appear to be associated with the H-2 0-0 S(4) emission, which traces a gas component with a temperature of 700-1000 K. The H2O abundance with respect to H-2 0-0 S(4) is estimated to be X(H2O)
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- stars: formation
- ISM: individual objects: HH 54
- infrared: ISM
- Herbig-Haro objects
- ISM: jets and outflows
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Santangelo, G.
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Antoniucci, S.
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Nisini, B.
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Codella, C.
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Bjerkeli, Per, 1 ...
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Giannini, T.
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Lorenzani, A.
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Lundin, L. K.
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Cabrit, S.
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Calzoletti, L.
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Liseau, René, 19 ...
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Neufeld, D. A.
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Tafalla, M.
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van Dishoeck, E. ...
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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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Astronomy and As ...
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Chalmers University of Technology