Melnick, G. J., Tolls, V., Neufeld, D. A., Bergin, E. A., Phillips, T. G., Wang, S., Crockett, N. R., Bell, T. A., Blake, G. A., Cabrit, S., Caux, E., Ceccarelli, C., Cernicharo, J., Comito, C., Daniel, F., Dubernet, M. -L., Emprechtinger, M., Encrenaz, P., Falgarone, E., Gerin, M., Giesen, T. F., Goicoechea, J. R., Goldsmith, P. F., Herbst, E., Joblin, C., Johnstone, D., Langer, W. D., Latter, W. D., Lis, D. C., Lord, S. D., Maret, S., Martin, P. G., Menten, K. M., Morris, P., Mueller, H. S. P., Murphy, J. A., Ossenkopf, V., Pagani, L., Pearson, J. C., Perault, M., Plume, R., Qin, S. -L., Salez, M., Schilke, P., Schlemmer, S., Stutzki, J., Trappe, N., van der Tak, F. F. S., Vastel, C., Yorke, H. W., Yu, S. and Zmuidzinas, J. (2010). Herschel observations of EXtra-Ordinary Sources (HEXOS): Observations of H2O and its isotopologues towards Orion KL. Astron. Astrophys., 521. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 0004-6361

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Abstract

We report the detection of more than 48 velocity-resolved ground rotational state transitions of (H2O)-O-16, (H2O)-O-18, and (H2O)-O-17 - most for the first time - in both emission and absorption toward Orion KL using Herschel/HIFI. We show that a simple fit, constrained to match the known emission and absorption components along the line of sight, is in excellent agreement with the spectral profiles of all the water lines. Using the measured (H2O)-O-18 line fluxes, which are less affected by line opacity than their (H2O)-O-16 counterparts, and an escape probability method, the column densities of (H2O)-O-18 associated with each emission component are derived. We infer total water abundances of 7.4 x 10(-5), 1.0 x 10(-5), and 1.6 x 10(-5) for the plateau, hot core, and extended warm gas, respectively. In the case of the plateau, this value is consistent with previous measures of the Orion-KL water abundance as well as those of other molecular outflows. In the case of the hot core and extended warm gas, these values are somewhat higher than water abundances derived for other quiescent clouds, suggesting that these regions are likely experiencing enhanced water-ice sublimation from (and reduced freeze-out onto) grain surfaces due to the warmer dust in these sources.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Melnick, G. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tolls, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Neufeld, D. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bergin, E. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Phillips, T. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wang, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Crockett, N. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bell, T. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Blake, G. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cabrit, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Caux, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ceccarelli, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cernicharo, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Comito, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Daniel, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dubernet, M. -L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Emprechtinger, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Encrenaz, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Falgarone, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gerin, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Giesen, T. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goicoechea, J. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goldsmith, P. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Herbst, E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Joblin, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Johnstone, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Langer, W. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Latter, W. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lis, D. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lord, S. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Maret, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Martin, P. G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Menten, K. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Morris, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mueller, H. S. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Murphy, J. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ossenkopf, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pagani, L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pearson, J. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Perault, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Plume, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Qin, S. -L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Salez, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schilke, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schlemmer, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stutzki, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Trappe, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van der Tak, F. F. S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vastel, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yorke, H. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Yu, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zmuidzinas, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-494961
DOI: 10.1051/0004-6361/201015085
Journal or Publication Title: Astron. Astrophys.
Volume: 521
Date: 2010
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 0004-6361
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
WAVE-ASTRONOMY-SATELLITE; WATER-VAPOR; SUBMILLIMETER; INSTRUMENT; ABSORPTION; EMISSION; OUTFLOWS; REGION; OMC-1; SWASMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/49496

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