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SOFIA/EXES observat...
SOFIA/EXES observations of water absorption in the protostar AFGL 2591 at high spectral resolution
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Indriolo, Nick (author)
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Neufeld, D. A. (author)
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DeWitt, C. N. (author)
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Richter, M. J. (author)
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Boogert, A. C. A. (author)
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Harper, G. M. (author)
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Jaffe, D. T. (author)
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Kulas, K. R. (author)
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McKelvey, M. E. (author)
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- Ryde, Nils (author)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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Vacca, W. (author)
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(creator_code:org_t)
- 2015
- 2015
- English.
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In: Astrophysical Journal Letters. - 2041-8213. ; 802:2
- Related links:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Subject headings
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- We present high spectral resolution (similar to 3 km s(-1)) observations of the nu(2) ro-vibrational band of H2O in the 6.086-6.135 mu m range toward the massive protostar AFGL 2591 using the Echelon-Cross-Echelle Spectrograph (EXES) on the Stratospheric Observatory for Infrared Astronomy (SOFIA). Ten absorption features are detected in total, with seven caused by transitions in the nu(2) band of H2O, two by transitions in the first vibrationally excited nu(2) band of H2O, and one by a transition in the nu(2) band of (H2O)-O-18. Among the detected transitions is the nu(2) 1(1,1)-0(0,0) line that probes the lowest-lying rotational level of para-H2O. The stronger transitions appear to be optically thick, but reach maximum absorption at a depth of about 25%, suggesting that the background source is only partially covered by the absorbing gas or that the absorption arises within the 6 mu m emitting photosphere. Assuming a covering fraction of 25%, the H2O column density and rotational temperature that best fit the observed absorption lines are N(H2O) = (1.3 +/- 0.3) x 10(19) cm(-2) and T = 640 +/- 80 K.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- stars: protostars
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Indriolo, Nick
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Neufeld, D. A.
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DeWitt, C. N.
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Richter, M. J.
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Boogert, A. C. A ...
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Harper, G. M.
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show more...
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Jaffe, D. T.
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Kulas, K. R.
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McKelvey, M. E.
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Ryde, Nils
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Vacca, W.
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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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Astrophysical Jo ...
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Lund University