Herschel observations of EXtra-Ordinary Sources (HEXOS): Observations of H2O and its isotopologues towards Orion KL
G. J. Melnick
(1)
,
V. Tolls
,
D. A. Neufeld
,
E. A. Bergin
(2)
,
T. G. Phillips
(3)
,
S. Wang
(2)
,
N. R. Crockett
,
T. A. Bell
,
G. A. Blake
(4)
,
S. Cabrit
(5)
,
E. Caux
(6, 6)
,
C. Ceccarelli
(7)
,
J. Cernicharo
(8)
,
C. Comito
(9)
,
F. Daniel
(5, 8, 10)
,
M.-L. Dubernet
(5)
,
M. Emprechtinger
(11)
,
P. Encrenaz
(5)
,
E. Falgarone
(12)
,
M. Gerin
(5, 12)
,
T. F. Giesen
,
J. R. Goicoechea
(5)
,
P. F. Goldsmith
,
E. Herbst
(13, 14)
,
C. Joblin
(6)
,
D. Johnstone
(15)
,
W. D. Langer
,
W. D. Latter
,
D. C. Lis
(3)
,
S. D. Lord
,
S. Maret
(7)
,
P. G. Martin
(16)
,
K. M. Menten
(17)
,
P. Morris
(18)
,
H. S. P. Müller
,
J. A. Murphy
,
V. Ossenkopf
(19, 20)
,
L. Pagani
(5)
,
J. C. Pearson
(21)
,
M. Pérault
(5)
,
R. Plume
(22)
,
S.-L. Qin
,
M. Salez
(7)
,
P. Schilke
(9, 23)
,
S. Schlemmer
(23)
,
J. Stutzki
(23)
,
N. Trappe
(24)
,
F. F. S. van Der Tak
(25, 20)
,
C. Vastel
(6, 6)
,
H. W. Yorke
,
S. Yu
(26)
,
J. Zmuidzinas
(11)
1
CfA -
Harvard-Smithsonian Center for Astrophysics
2 Department of Astronomy [Ann Arbor]
3 CALTECH - California Institute of Technology
4 LOCIE - LabOratoire proCédés énergIe bâtimEnt
5 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
6 CESR - Centre d'étude spatiale des rayonnements
7 LAOG - Laboratoire d'Astrophysique de Grenoble
8 CAB - Centro de Astrobiologia [Madrid]
9 Max Planck Institute for Radio Astronomy
10 ENS-PSL - École normale supérieure - Paris
11 Cahill Center for Astronomy and Astrophysics
12 LRA - Laboratoire de Radioastronomie
13 OSU - Department of Physics [Ohio State University]
14 Ohio State Univ, Dept Astron & Chem, Columbus, OH 43210 USA
15 Natl Res Council Canada, Herzberg Inst Astrophys, Victoria, BC V9E 2E7 Canada
16 LM2C - Laboratoire de Modélisation Multi-échelles des Combustibles
17 MPIFR - Max-Planck-Institut für Radioastronomie
18 IPAC - Infrared Processing and Analysis Center
19 LUTH (UMR_8102) - Laboratoire Univers et Théories
20 SRON - SRON Netherlands Institute for Space Research
21 FL - foreign laboratories
22 Department of Physics and Astronomy [Calgary]
23 I. Physikalisches Institut [Köln]
24 LDAR (EA_4434) - Laboratoire de Didactique André Revuz
25 Kapteyn Astronomical Institute [Groningen]
26 JPL - Jet Propulsion Laboratory
2 Department of Astronomy [Ann Arbor]
3 CALTECH - California Institute of Technology
4 LOCIE - LabOratoire proCédés énergIe bâtimEnt
5 LERMA - Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique
6 CESR - Centre d'étude spatiale des rayonnements
7 LAOG - Laboratoire d'Astrophysique de Grenoble
8 CAB - Centro de Astrobiologia [Madrid]
9 Max Planck Institute for Radio Astronomy
10 ENS-PSL - École normale supérieure - Paris
11 Cahill Center for Astronomy and Astrophysics
12 LRA - Laboratoire de Radioastronomie
13 OSU - Department of Physics [Ohio State University]
14 Ohio State Univ, Dept Astron & Chem, Columbus, OH 43210 USA
15 Natl Res Council Canada, Herzberg Inst Astrophys, Victoria, BC V9E 2E7 Canada
16 LM2C - Laboratoire de Modélisation Multi-échelles des Combustibles
17 MPIFR - Max-Planck-Institut für Radioastronomie
18 IPAC - Infrared Processing and Analysis Center
19 LUTH (UMR_8102) - Laboratoire Univers et Théories
20 SRON - SRON Netherlands Institute for Space Research
21 FL - foreign laboratories
22 Department of Physics and Astronomy [Calgary]
23 I. Physikalisches Institut [Köln]
24 LDAR (EA_4434) - Laboratoire de Didactique André Revuz
25 Kapteyn Astronomical Institute [Groningen]
26 JPL - Jet Propulsion Laboratory
V. Tolls
- Fonction : Auteur
D. A. Neufeld
- Fonction : Auteur
N. R. Crockett
- Fonction : Auteur
T. A. Bell
- Fonction : Auteur
S. Cabrit
- Fonction : Auteur
- PersonId : 755514
- ORCID : 0000-0002-1593-3693
- IdRef : 139572686
E. Caux
- Fonction : Auteur
- PersonId : 742272
- IdHAL : manulcaux
- ORCID : 0000-0002-4463-6663
- IdRef : 032169922
J. Cernicharo
- Fonction : Auteur
- PersonId : 755513
- ORCID : 0000-0002-3518-2524
- IdRef : 033601550
T. F. Giesen
- Fonction : Auteur
P. F. Goldsmith
- Fonction : Auteur
C. Joblin
- Fonction : Auteur
- PersonId : 21867
- IdHAL : christine-joblin
- ORCID : 0000-0003-1561-6118
- IdRef : 052563693
W. D. Langer
- Fonction : Auteur
W. D. Latter
- Fonction : Auteur
S. D. Lord
- Fonction : Auteur
S. Maret
- Fonction : Auteur
- PersonId : 177813
- IdHAL : sebastien-maret
- ORCID : 0000-0003-1104-4554
P. Morris
- Fonction : Auteur
- PersonId : 756945
- ORCID : 0000-0002-8533-8232
H. S. P. Müller
- Fonction : Auteur
J. A. Murphy
- Fonction : Auteur
L. Pagani
- Fonction : Auteur
- PersonId : 173664
- IdHAL : laurent-pagani
- ORCID : 0000-0002-3319-1021
- IdRef : 031462812
S.-L. Qin
- Fonction : Auteur
P. Schilke
- Fonction : Auteur
- PersonId : 755787
- ORCID : 0000-0003-2141-5689
H. W. Yorke
- Fonction : Auteur
Résumé
We report the detection of more than 48 velocity-resolved ground rotational state transitions of H_216O, H_218O, and H_217O - 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 H_218O line fluxes, which are less affected by line opacity than their H_2 16O counterparts, and an escape probability method, the column densities of H_218O associated with each emission component are derived. We infer total water abundances of 7.4 × 10-5, 1.0 × 10-5, and 1.6 × 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. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.Table 3 (page 5) is only available in electronic form at http://www.aanda.org