Odin observations of H2O in the Galactic Centre

被引：21

作者：

Sandqvist, A ^{[1
]}

Bergman, P

Black, JH

Booth, R

Buat, V

Curry, CL

Encrenaz, P

Falgarone, E

Feldman, P

Fich, M

Floren, HG

Frisk, U

Gerin, M

Gregersen, EM

Harju, J

Hasegawa, T

Hjalmarson, A

Johansson, LEB

Kwok, S

Larsson, B

Lecacheux, A

Liljeström, T

Lindqvist, M

Liseau, R

Mattila, K

Mitchell, GF

Nordh, L

Olberg, M

Olofsson, AOH

Olofsson, G

Pagani, L

Plume, R

Ristorcelli, I

von Schéele, F

Serra, G

Tothill, NFH

Volk, K

Wilson, CD

Winnberg, A

机构：

[1] SCFAB AlbaNova, Stockholm Observ, S-10691 Stockholm, Sweden

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

[3] Astron Spatiale Lab, F-13376 Marseille, France

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

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

[6] Observ Paris, CNRS, FRE 2460, F-75014 Paris, France

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

[8] Ecole Normale Super, CNRS, FRE 2460, F-75005 Paris, France

[9] Herzberg Inst Astrophys, Victoria, BC V9E 2E7, Canada

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

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

[12] Univ Helsinki Observ, Helsinki 00014, Finland

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

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

[15] Helsinki Univ Technol, Metsahovi Radio Observ, FIN-02150 Espoo, Finland

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

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

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

来源：

ASTRONOMY & ASTROPHYSICS | 2003年 / 402卷 / 03期

关键词：

galaxy : center; ISM : individual objects : SgrA; ISM : molecules; ISM : clouds;

D O I：

10.1051/0004-6361:20030341

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The Odin satellite has been used to detect emission and absorption in the 557-GHz (H2O)-O-16 line in the Galactic Centre towards the SgrA(star) Circumnuclear Disk ( CND), and the SgrA + 20 km s(-1) and + 50 km s(-1) molecular clouds. Strong broad H2O emission lines have been detected in all three objects. Narrow H2O absorption lines are present at all three positions and originate along the lines of sight in the 3-kpc Spiral Arm, the -30 km s(-1) Spiral Arm and the Local Sgr Spiral Arm. Broad H2O absorption lines near -130 km s(-1) are also observed, originating in the Expanding Molecular Ring. A new molecular feature ( the "High Positive Velocity Gas"-HPVG) has been identified in the positive velocity range of approximate to + 120 to + 220 km s(-1), seen definitely in absorption against the stronger dust continuum emission from the + 20 km s(-1) and + 50 km s(-1) clouds and possibly in emission towards the position of SgrA(star) CND. The 548-GHz (H2O)-O-18 isotope line towards the CND is not detected at the 0.02 K (rms) level.

引用

页码：L63 / L67

页数：5

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