Molecular oxygen in the ρOphiuchi cloud

被引：130

作者：

Larsson, B. ^{[1
]}

Liseau, R.

Pagani, L.

Bergman, P.

Bernath, P.

Biver, N.

Black, J. H.

Booth, R. S.

Buat, V.

Crovisier, J.

Curry, C. L.

Dahlgren, M.

Encrenaz, P. J.

Falgarone, E.

Feldman, P. A.

Fich, M.

Floren, H. G.

Fredrixon, M.

Frisk, U.

Gahm, G. F.

Gerin, M.

Hagstrom, M.

Harju, J.

Hasegawa, T.

Hjalmarson, A.

Johansson, L. E. B.

Justtanont, K.

Klotz, A.

Kyrola, E.

Kwok, S.

Lecacheux, A.

Liljestrom, T.

Llewellyn, E. J.

Lundin, S.

Megie, G.

Mitchell, G. F.

Murtagh, D.

Nordh, L. H.

Nyman, L.-A.

Olberg, M.

Olofsson, A. O. H.

Olofsson, G.

Olofsson, H.

Persson, G.

Plume, R.

Rickman, H.

Ristorcelli, I.

Rydbeck, G.

Sandqvist, A. A.

Scheele, F. V.

机构：

[1] AlbaNova Univ Ctr, Stockholm Observ, S-10691 Stockholm, Sweden

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

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

[4] Onsala Space Observ, S-43992 Onsala, Sweden

[5] Univ Waterloo, Dept Phys, Waterloo, ON N2L 3G1, Canada

[6] Observ Paris, LESIA, Meudon Sect, F-92195 Meudon, France

[7] Astron Spatiale Lab, F-13376 Marseille 12, France

[8] Ecole Normale Super, CNRS, LERMA, F-75005 Paris, France

[9] Ecole Normale Super, CNRS, UMR 8112, F-75005 Paris, France

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

[11] Swedish Space Corp, S-17104 Solna, Sweden

[12] Univ Helsinki, Observ, FIN-00014 Helsinki, Finland

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

[14] Ctr Etud Spatiale Rayonnements, F-31029 Toulouse, France

[15] Finnish Meteorol Inst, FIN-00101 Helsinki, Finland

[16] Acad Sinica, Inst Astron & Astrophys, Taipei 106, Taiwan

[17] Aalto Univ, Metsahovi Radio Observ, FIN-02150 Espoo, Finland

[18] Univ Saskatchewan, Dept Phys & Engn Phys, Saskatoon, SK S7N 5E2, Canada

[19] Univ Paris 06, Inst Pierre Simon Laplace, CNRS, F-75252 Paris 05, France

[20] St Marys Univ, Dept Phys & Astron, Halifax, NS B3H 3C3, Canada

[21] Chalmers, Global Environm Measurements Grp, S-41296 Gothenburg, Sweden

[22] Swedish Natl Space Board, S-17104 Solna, Sweden

[23] European So Observ, APEX Team, Santiago 19, Chile

[24] Uppsala Astron Observ, S-75120 Uppsala, Sweden

[25] Canadian Space Agcy, St Hubert, PQ J3Y 8Y9, Canada

[26] ESA, Space Telescope Div, STScI, Baltimore, MD 21218 USA

[27] McMaster Univ, Dept Phys & Astron, Hamilton, ON L8S 4M1, Canada

[28] Stockholm Univ, Dept Meteorol, S-10691 Stockholm, Sweden

来源：

ASTRONOMY & ASTROPHYSICS | 2007年 / 466卷 / 03期

关键词：

ISM : individual objects : rho OphA; ISM : clouds; ISM : molecules; ISM : abundances; stars : formation; radio lines : ISM;

D O I：

10.1051/0004-6361:20065500

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. Molecular oxygen, O-2, has been expected historically to be an abundant component of the chemical species in molecular clouds and, as such, an important coolant of the dense interstellar medium. However, a number of attempts from both ground and from space have failed to detect O-2 emission. Aims. The work described here uses heterodyne spectroscopy from space to search for molecular oxygen in the interstellar medium. Methods. The Odin satellite carries a 1.1m sub-millimeter dish and a dedicated 119 GHz receiver for the ground state line of O-2. Starting in 2002, the star forming molecular cloud core rho OphA was observed with Odin for 34 days during several observing runs. Results. We detect a spectral line at v(LSR)= + 3.5 km s(-1) with = vFWHM = 1.5 km s(-1), parameters which are also common to other species associated with rho OphA. This feature is identified as the O-2 (N-J = 1(1)- 1(0)) transition at 118 750.343 MHz. Conclusions. The abundance of molecular oxygen, relative to H-2, is 5 x 10(-8) averaged over the Odin beam. This abundance is consistently lower than previously reported upper limits.

引用

页码：999 / U158

页数：11

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