Herschel observations of ortho- and para-oxidaniumyl (H2O+) in spiral arm clouds toward Sagittarius B2(M)

被引：33

作者：

Schilke, P. ^{[1
,2
]}

Comito, C. ^{[2
]}

Mueller, H. S. P. ^{[1
]}

Bergin, E. A. ^{[3
]}

Herbst, E. ^{[15
,16
,17
]}

Lis, D. C. ^{[4
]}

Neufeld, D. A. ^{[23
]}

Phillips, T. G. ^{[4
]}

Bell, T. A. ^{[4
]}

Blake, G. A. ^{[5
]}

Cabrit, S. ^{[27
,28
]}

Caux, E. ^{[6
,7
]}

Ceccarelli, C. ^{[8
]}

Cernicharo, J. ^{[9
]}

Crockett, N. R. ^{[3
]}

Daniel, F. ^{[9
,10
,11
]}

Dubernet, M. -L. ^{[12
,13
]}

Emprechtinger, M. ^{[4
]}

Encrenaz, P. ^{[10
,11
]}

Falgarone, E. ^{[10
,11
]}

Gerin, M. ^{[10
,11
]}

Giesen, T. F. ^{[1
]}

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

Goldsmith, P. F. ^{[14
]}

Gupta, H. ^{[14
]}

Joblin, C. ^{[6
,7
]}

Johnstone, D. ^{[18
]}

Langer, W. D. ^{[14
]}

Latter, W. B. ^{[19
]}

Lord, S. D. ^{[19
]}

Maret, S. ^{[8
]}

Martin, P. G. ^{[20
]}

Melnick, G. J. ^{[21
]}

Menten, K. M. ^{[2
]}

Morris, P. ^{[19
]}

Murphy, J. A. ^{[22
]}

Ossenkopf, V. ^{[13
,24
]}

Pagani, L. ^{[27
,28
]}

Pearson, J. C. ^{[14
]}

Perault, M. ^{[10
,11
]}

Plume, R. ^{[25
]}

Qin, S. -L. ^{[14
]}

Salez, M. ^{[27
,28
]}

Schlemmer, S. ^{[1
]}

Stutzki, J. ^{[1
]}

Trappe, N. ^{[22
]}

van der Tak, F. F. S. ^{[24
]}

Vastel, C. ^{[6
,7
]}

Wang, S. ^{[3
]}

Yorke, H. W. ^{[14
]}

机构：

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

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

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

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

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

[6] Univ Toulouse UPS, Ctr Etud Spatiale Rayonnements, F-31062 Toulouse 9, France

[7] CNRS INSU, UMR 5187, F-31028 Toulouse 4, France

[8] Observ Grenoble, Astrophys Lab, F-38041 Grenoble 9, France

[9] Lab Astrofis Mol, Ctr Astrobiol CSIC INTA, Madrid, Spain

[10] Observ Paris, UMR8112, CNRS, LERMA, F-75231 Paris 05, France

[11] Ecole Normale Super, F-75231 Paris 05, France

[12] Univ Paris 06, UMR7092, LPMAA, Paris, France

[13] Observ Paris, LUTH, UMR8102, Meudon, France

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

[15] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[16] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA

[17] Ohio State Univ, Dept Chem, Columbus, OH 43210 USA

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

[19] CALTECH, Ctr Infrared Proc & Anal, Pasadena, CA 91125 USA

[20] Univ Toronto, Canadian Inst Theoret Astrophys, Toronto, ON M5S 3H8, Canada

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

[22] Natl Univ Ireland Maynooth, Maynooth, Kildare, Ireland

[23] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

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

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

[26] Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA

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

[28] Observ Paris, UMR8112, CNRS, F-75014 Paris, France

来源：

ASTRONOMY & ASTROPHYSICS | 2010年 / 521卷

关键词：

astrochemistry; line: profiles; molecular processes; LASER MAGNETIC-RESONANCE; MOLECULAR-SPECTROSCOPY; COLOGNE DATABASE; SUBMILLIMETER; LINE; BAND; SPECTRUM; B2; HYDROGEN; SPACE;

D O I：

10.1051/0004-6361/201015087

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

H2O+ has been observed in its ortho- and para- states toward the massive star forming core Sgr B2(M), located close to the Galactic center. The observations show absorption in all spiral arm clouds between the Sun and Sgr B2. The average o/p ratio of H2O+ in most velocity intervals is 4.8, which corresponds to a nuclear spin temperature of 21 K. The relationship of this spin temperature to the formation temperature and current physical temperature of the gas hosting H2O+ is discussed, but no firm conclusion is reached. In the velocity interval 0-60 km s(-1), an ortho/para ratio of below unity is found, but if this is due to an artifact of contamination by other species or real is not clear.

引用

页数：7

共 15 条

[1] Ortho/Para Ratio of H2O+ Toward Sagittarius B2(M) Revisited
Schilke, Peter
Lis, Dariusz C.
Bergin, Edwin A.
Higgins, Ronan
Comito, Claudia
JOURNAL OF PHYSICAL CHEMISTRY A, 2013, 117 (39): : 9766 - 9769
[2] HERSCHEL/HIFI OBSERVATIONS OF HYDROGEN FLUORIDE TOWARD SAGITTARIUS B2(M)
Monje, R. R.
Emprechtinger, M.
Phillips, T. G.
Lis, D. C.
Goldsmith, P. F.
Bergin, E. A.
Bell, T. A.
Neufeld, D. A.
Sonnentrucker, P.
ASTROPHYSICAL JOURNAL LETTERS, 2011, 734 (01)
[3] Herschel/HIFI measurements of the ortho/para ratio in water towards Sagittarius B2(M) and W31C
Lis, D. C.
Phillips, T. G.
Goldsmith, P. F.
Neufeld, D. A.
Herbst, E.
Comito, C.
Schilke, P.
Mueller, H. S. P.
Bergin, E. A.
Gerin, M.
Bell, T. A.
Emprechtinger, M.
Black, J. H.
Blake, G. A.
Boulanger, F.
Caux, E.
Ceccarelli, C.
Cernicharo, J.
Coutens, A.
Crockett, N. R.
Daniel, F.
Dartois, E.
De Luca, M.
Dubernet, M. -L.
Encrenaz, P.
Falgarone, E.
Geballe, T. R.
Godard, B.
Giesen, T. F.
Goicoechea, J. R.
Gry, C.
Gupta, H.
Hennebelle, P.
Hily-Blant, P.
Kolos, R.
Krelowski, J.
Joblin, C.
Johnstone, D.
Kazmierczak, M.
Lord, S. D.
Maret, S.
Martin, P. G.
Martin-Pintado, J.
Melnick, G. J.
Menten, K. M.
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Mookerjea, B.
Morris, P.
Murphy, J. A.
Ossenkopf, V.
ASTRONOMY & ASTROPHYSICS, 2010, 521
[4] Herschel observations of extraordinary sources: full Herschel/HIFI molecular line survey of Sagittarius B2(M)
Moeller, T.
Schilke, P.
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Bergin, E. A.
Lis, D. C.
Sanchez-Monge, A.
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Comito, C.
ASTRONOMY & ASTROPHYSICS, 2021, 651
[5] VLBI OBSERVATIONS OF THE H2O MASERS IN SAGITTARIUS B2
ELMEGREEN, BG
GENZEL, R
MORAN, JM
REID, MJ
WALKER, RC
ASTROPHYSICAL JOURNAL, 1980, 241 (03): : 1007 - 1013
[6] Determination of the Ortho to Para Ratio of H2Cl+ and H2O+ from Submillimeter Observations
Gerin, Maryvonne
de Luca, Massimo
Lis, Dariusz C.
Kramer, Carsten
Navarro, Santiago
Neufeld, David
Indriolo, Nick
Godard, Benjamin
Le Petit, Franck
Peng, Ruisheng
Phillips, Thomas G.
Roueff, Evelyne
JOURNAL OF PHYSICAL CHEMISTRY A, 2013, 117 (39): : 10018 - 10026
[7] Ortho-to-Para Ratio in Interstellar Water on the Sight line toward Sagittarius B2(N)
Lis, Dariusz C.
Bergin, Edwin A.
Schilke, Peter
van Dishoeck, Ewine F.
JOURNAL OF PHYSICAL CHEMISTRY A, 2013, 117 (39): : 9661 - 9665
[8] A strong flare of the H2O maser in Sagittarius B2(M)
O. Ramírez Hernández
E. E. Lekht
A. M. Tolmachev
Astronomy Reports, 2005, 49 : 777 - 782
[9] A strong flare of the H2O maser in sagittarius B2(M)
Hernández, OR
Lekht, EE
Tolmachev, AM
ASTRONOMY REPORTS, 2005, 49 (10) : 777 - 782
[10] Herschel/HIFI observations of extraordinary sources: The Orion and Sagittarius B2 molecular clouds a guaranteed time key program proposal
Crockett, Nathan R.
Bergin, Edwin A.
Wang, Shiya
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, 2010, 239

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