Odin observations of the Galactic centre in the 118-GHz band: Upper limit to the O2 abundance

Aa Sandqvist, B. Larsson, Å Hjalmarson, P. Bergman, P. Bernath, U. Frisk, M. Olberg, L. Pagani, Lucy M Ziurys

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Aims. The Odin satellite has been used to search for the 118.75-GHz line of molecular oxygen (O) in the Galactic centre.Methods. Odin observations were performed towards the Sgr circumnuclear disk (CND), and the Sgr A +20 km s and +50 km s molecular clouds using the position-switching mode. Supplementary ground-based observations were carried out in the 2-mm band using the ARO Kitt Peak 12-m telescope to examine suspected SiC features.Results. A strong emission line was found at 118.27 GHz, attributable to the HCN line. Upper limits are presented for the 118.75-GHz O ground transition line and for the 118.11-GHz , ground state SiC line at the Galactic centre. Upper limits are also presented for the 487-GHz O line in the Sgr A +50 km s cloud and for the 157-GHz, , SiC line in the Sgr A +20 and +50 km s clouds, as well as the CND. The CHOH line complex at 157.2-157.3 GHz has been detected in the +20 and +50 kms clouds but not towards Sgr /CND.Conclusions. A upper limit for the fractional abundance ratio of [ O] /[ H] is found to be (O) towards the Sgr A molecular belt region.

Original languageEnglish (US)
Pages (from-to)849-853
Number of pages5
JournalAstronomy and Astrophysics
Volume482
Issue number3
DOIs
StatePublished - May 2008

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molecular clouds
telescopes
oxygen
ground state
method

Keywords

  • Galaxy: center
  • ISM: abundances
  • ISM: clouds
  • ISM: individual objects: Sgr A
  • ISM: molecules

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Odin observations of the Galactic centre in the 118-GHz band : Upper limit to the O2 abundance. / Sandqvist, Aa; Larsson, B.; Hjalmarson, Å; Bergman, P.; Bernath, P.; Frisk, U.; Olberg, M.; Pagani, L.; Ziurys, Lucy M.

In: Astronomy and Astrophysics, Vol. 482, No. 3, 05.2008, p. 849-853.

Research output: Contribution to journalArticle

Sandqvist, A, Larsson, B, Hjalmarson, Å, Bergman, P, Bernath, P, Frisk, U, Olberg, M, Pagani, L & Ziurys, LM 2008, 'Odin observations of the Galactic centre in the 118-GHz band: Upper limit to the O2 abundance', Astronomy and Astrophysics, vol. 482, no. 3, pp. 849-853. https://doi.org/10.1051/0004-6361:200809436
Sandqvist, Aa ; Larsson, B. ; Hjalmarson, Å ; Bergman, P. ; Bernath, P. ; Frisk, U. ; Olberg, M. ; Pagani, L. ; Ziurys, Lucy M. / Odin observations of the Galactic centre in the 118-GHz band : Upper limit to the O2 abundance. In: Astronomy and Astrophysics. 2008 ; Vol. 482, No. 3. pp. 849-853.
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abstract = "Aims. The Odin satellite has been used to search for the 118.75-GHz line of molecular oxygen (O) in the Galactic centre.Methods. Odin observations were performed towards the Sgr circumnuclear disk (CND), and the Sgr A +20 km s and +50 km s molecular clouds using the position-switching mode. Supplementary ground-based observations were carried out in the 2-mm band using the ARO Kitt Peak 12-m telescope to examine suspected SiC features.Results. A strong emission line was found at 118.27 GHz, attributable to the HCN line. Upper limits are presented for the 118.75-GHz O ground transition line and for the 118.11-GHz , ground state SiC line at the Galactic centre. Upper limits are also presented for the 487-GHz O line in the Sgr A +50 km s cloud and for the 157-GHz, , SiC line in the Sgr A +20 and +50 km s clouds, as well as the CND. The CHOH line complex at 157.2-157.3 GHz has been detected in the +20 and +50 kms clouds but not towards Sgr /CND.Conclusions. A upper limit for the fractional abundance ratio of [ O] /[ H] is found to be (O) towards the Sgr A molecular belt region.",
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AU - Hjalmarson, Å

AU - Bergman, P.

AU - Bernath, P.

AU - Frisk, U.

AU - Olberg, M.

AU - Pagani, L.

AU - Ziurys, Lucy M

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N2 - Aims. The Odin satellite has been used to search for the 118.75-GHz line of molecular oxygen (O) in the Galactic centre.Methods. Odin observations were performed towards the Sgr circumnuclear disk (CND), and the Sgr A +20 km s and +50 km s molecular clouds using the position-switching mode. Supplementary ground-based observations were carried out in the 2-mm band using the ARO Kitt Peak 12-m telescope to examine suspected SiC features.Results. A strong emission line was found at 118.27 GHz, attributable to the HCN line. Upper limits are presented for the 118.75-GHz O ground transition line and for the 118.11-GHz , ground state SiC line at the Galactic centre. Upper limits are also presented for the 487-GHz O line in the Sgr A +50 km s cloud and for the 157-GHz, , SiC line in the Sgr A +20 and +50 km s clouds, as well as the CND. The CHOH line complex at 157.2-157.3 GHz has been detected in the +20 and +50 kms clouds but not towards Sgr /CND.Conclusions. A upper limit for the fractional abundance ratio of [ O] /[ H] is found to be (O) towards the Sgr A molecular belt region.

AB - Aims. The Odin satellite has been used to search for the 118.75-GHz line of molecular oxygen (O) in the Galactic centre.Methods. Odin observations were performed towards the Sgr circumnuclear disk (CND), and the Sgr A +20 km s and +50 km s molecular clouds using the position-switching mode. Supplementary ground-based observations were carried out in the 2-mm band using the ARO Kitt Peak 12-m telescope to examine suspected SiC features.Results. A strong emission line was found at 118.27 GHz, attributable to the HCN line. Upper limits are presented for the 118.75-GHz O ground transition line and for the 118.11-GHz , ground state SiC line at the Galactic centre. Upper limits are also presented for the 487-GHz O line in the Sgr A +50 km s cloud and for the 157-GHz, , SiC line in the Sgr A +20 and +50 km s clouds, as well as the CND. The CHOH line complex at 157.2-157.3 GHz has been detected in the +20 and +50 kms clouds but not towards Sgr /CND.Conclusions. A upper limit for the fractional abundance ratio of [ O] /[ H] is found to be (O) towards the Sgr A molecular belt region.

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