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Odin observations of the Galactic centre in the 118-GHz band - Upper limit to the O-2 abundance

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Author(s)

  • Aa. Sandqvist
  • B. Larsson
  • A. Hjalmarson
  • P. Bergman
  • P. Bernath
  • U. Frisk
  • M. Olberg
  • L. Pagani
  • L. M. Ziurys

Department/unit(s)

Publication details

JournalAstronomy & Astrophysics
DatePublished - May 2008
Issue number3
Volume482
Number of pages5
Pages (from-to)849-853
Original languageEnglish

Abstract

Aims. The Odin satellite has been used to search for the 118.75-GHz line of molecular oxygen (O-2) in the Galactic centre.

Methods. Odin observations were performed towards the Sgr A* circumnuclear disk (CND), and the Sgr A + 20 km s(-1) and + 50 km s(-1) 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 J = 13-12 HC3N line. Upper limits are presented for the 118.75-GHz O-2 (11-10) ground transition line and for the 118.11-GHz (3)Pi(2), J = 3-2 ground state SiC line at the Galactic centre. Upper limits are also presented for the 487-GHz O-2 line in the SgrA + 50 km s(-1) cloud and for the 157-GHz, J = 4-3, SiC line in the SgrA + 20 and + 50 km s(-1) clouds, as well as the CND. The CH3OH line complex at 157.2-157.3 GHz has been detected in the + 20 and + 50 km s(-1) clouds but not towards SgrA*/CND.

Conclusions. A 3 sigma upper limit for the fractional abundance ratio of [O-2]/[H-2] is found to be X(O-2) = 1.2 x 10(-7) towards the SgrA molecular belt region.

    Research areas

  • galaxy : center, ISM : individual objects : SgrA, ISM : molecules, ISM : clouds, ISM : abundances, RHO-OPHIUCHI CLOUD, MOLECULAR CLOUDS, SGR-A, SATELLITE, SUBMILLIMETER, OXYGEN, CYANOACETYLENE, MILLIMETER, CHEMISTRY, EMISSION

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