Water in massive star-forming regions: HIFI observations of W3 IRS5

被引：45

作者：

Chavarria, L. ^{[1
,2
]}

Herpin, F. ^{[1
,2
]}

Jacq, T. ^{[1
,2
]}

Braine, J. ^{[1
,2
]}

Bontemps, S. ^{[1
,2
]}

Baudry, A. ^{[1
,2
]}

Marseille, M. ^{[3
]}

van der Tak, F. ^{[3
,4
]}

Pietropaoli, B. ^{[1
,2
,5
]}

Wyrowski, F. ^{[6
]}

Shipman, R. ^{[3
]}

Frieswijk, W. ^{[3
]}

van Dishoeck, E. F. ^{[7
,8
]}

Cernicharo, J. ^{[9
]}

Bachiller, R. ^{[10
]}

Benedettini, M. ^{[11
]}

Benz, A. O. ^{[12
]}

Bergin, E. ^{[13
]}

Bjerkeli, P. ^{[14
]}

Blake, G. A. ^{[15
]}

Bruderer, S. ^{[12
]}

Caselli, P. ^{[16
,17
]}

Codella, C. ^{[17
]}

Daniel, F. ^{[9
]}

di Giorgio, A. M. ^{[11
]}

Dominik, C. ^{[18
,19
]}

Doty, S. D. ^{[20
]}

Encrenaz, P. ^{[21
,22
]}

Fich, M. ^{[23
]}

Fuente, A. ^{[24
]}

Giannini, T. ^{[25
]}

Goicoechea, J. R. ^{[9
]}

de Graauw, Th. ^{[3
]}

Hartogh, P. ^{[26
]}

Helmich, F. ^{[3
]}

Herczeg, G. J.

Hogerheijde, M. R. ^{[7
]}

Johnstone, D. ^{[27
,28
]}

Jorgensen, J. K. ^{[29
]}

Kristensen, L. E. ^{[7
]}

Larsson, B. ^{[30
]}

Lis, D. ^{[31
]}

Liseau, R. ^{[14
]}

McCoey, C. ^{[23
,32
]}

Melnick, G. ^{[33
]}

Nisini, B. ^{[25
]}

Olberg, M. ^{[14
]}

Parise, B. ^{[6
]}

Pearson, J. C. ^{[34
]}

Plume, R. ^{[35
]}

机构：

[1] Univ Bordeaux, Lab Astrophys Bordeaux, Bordeaux, France

[2] CNRS INSU, UMR 5804, Floirac, France

[3] SRON Netherlands Inst Space Res, NL-9700 AV Groningen, Netherlands

[4] Univ Groningen, Kapteyn Astron Inst, NL-9700 AV Groningen, Netherlands

[5] Ecole Mines, F-44300 Nantes, France

[6] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[7] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

[8] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[9] CSIC INTA, Dept Astrofis, Ctr Astrobiol, Madrid 28850, Spain

[10] Observ Astron Nacl IGN, Madrid 28014, Spain

[11] INAF Ist Fis Spazio Interplanetario, Area Ric Tor Vergata, I-00133 Rome, Italy

[12] ETH, Inst Astron, CH-8093 Zurich, Switzerland

[13] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

[14] Chalmers, Onsala Space Observ, Dept Radio & Space Sci, S-43992 Onsala, Sweden

[15] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA

[16] Univ Leeds, Sch Phys & Astron, Leeds LS2 9JT, W Yorkshire, England

[17] INAF Osservatorio Astrofis Arcetri, I-50125 Florence, Italy

[18] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 SJ Amsterdam, Netherlands

[19] Radboud Univ Nijmegen, Dept Astrophys IMAPP, NL-6500 GL Nijmegen, Netherlands

[20] Denison Univ, Dept Phys & Astron, Granville, OH 43023 USA

[21] Observ Paris, LERMA, F-75014 Paris, France

[22] Observ Paris, CNRS, UMR 8112, F-75014 Paris, France

[23] Univ Waterloo, Dept Phys & Astron, Waterloo, ON N2L 3G1, Canada

[24] Observ Astron Nacl, Alcala De Henares 28803, Spain

[25] INAF Osservatorio Astron Roma, I-00040 Monte Porzio Catone, Italy

[26] MPI Sonnensyst Forsch, D-37191 Katlenburg Lindau, Germany

[27] Natl Res Council Canada, Herzberg Inst Astrophys, Victoria, BC V9E 2E7, Canada

[28] Univ Victoria, Dept Phys & Astron, Victoria, BC V9E 2E7, Canada

[29] Univ Copenhagen, Nat Hist Museum Denmark, Ctr Star & Planet Format, DK-1350 Copenhagen K, Denmark

[30] Stockholm Univ, Dept Astron, S-10691 Stockholm, Sweden

[31] CALTECH, Cahill Ctr Astron & Astrophys, Pasadena, CA 91125 USA

[32] Univ Western Ontario, Dept Phys & Astron, London, ON N6A 3K7, Canada

[33] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[34] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[35] Univ Calgary, Dept Phys & Astron, Calgary, AB T2N 1N4, Canada

[36] IRAM, E-18012 Granada, Spain

[37] Univ Cologne, Inst Phys 1, KOSMA, D-50937 Cologne, Germany

[38] Nicholas Copernicus Astron Ctr, PL-87100 Torun, Poland

来源：

ASTRONOMY & ASTROPHYSICS | 2010年 / 521卷

关键词：

stars: formation; stars: massive; ISM: molecules; ISM: abundances; dust; extinction; radio lines: ISM; RADIATIVE-TRANSFER; ABUNDANCES; ENVELOPES; RATIOS; SPECTROSCOPY; PROTOSTARS; TRAPEZIUM; CONTINUUM; TRACERS; MODELS;

D O I：

10.1051/0004-6361/201015113

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present Herschel observations of the water molecule in the massive star-forming region W3 IRS5. The o-(H2O)-O-17 1(10)-1(01), p-(H2O)-O-18 1(11)-0(00), p-H2O 2(02)-1(11), p-H2O 1(11)-0(00), o-H2O 2(21)-2(12), and o-H2O 2(12)-1(01) lines, covering a frequency range from 552 up to 1669 GHz, have been detected at high spectral resolution with HIFI. The water lines in W3 IRS5 show well-defined high-velocity wings that indicate a clear contribution by outflows. Moreover, the systematically blue-shifted absorption in the H2O lines suggests expansion, presumably driven by the outflow. No infall signatures are detected. The p-H2O 1(11)-0(00) and o-H2O 2(12)-1(01) lines show absorption from the cold material (T similar to 10 K) in which the high-mass protostellar envelope is embedded. One-dimensional radiative transfer models are used to estimate water abundances and to further study the kinematics of the region. We show that the emission in the rare isotopologues comes directly from the inner parts of the envelope (T greater than or similar to 100 K) where water ices in the dust mantles evaporate and the gas-phase abundance increases. The resulting jump in the water abundance (with a constant inner abundance of 10(-4)) is needed to reproduce the o-(H2O)-O-17 1(10)-1(01) and p-(H2O)-O-18 1(11)-0(00) spectra in our models. We estimate water abundances of 10(-8) to 10(-9) in the outer parts of the envelope (T less than or similar to 100 K). The possibility of two protostellar objects contributing to the emission is discussed.

引用

页数：5

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