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

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

2008-03-12

arxiv.org/abs/0803.1726v1

Astronomy and Astrophysics

Astrophysics

Accepted for publication in A&A. 6 journal pages, 5 figures

Scientific paper

10.1051/0004-6361:200809436

The Odin satellite has been used to search for the 118.75-GHz line of molecular oxygen (O2)in the Galactic centre. Odin observations were performed towards the Sgr A* 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. 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 O2 (1,1-1,0) ground transition line and for the 118.11-GHz 3Pi2, J=3-2 ground state SiC line at the Galactic centre. Upper limits are also presented for the 487-GHz O2 line in the Sgr A +50 km/s cloud and for the 157-GHz, J=4-3, SiC line in the Sgr A +20 and +50 km/s 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 clouds but not towards Sgr A*/CND. A 3-sigma upper limit for the fractional abundance ratio of [O2]/[H2] is found to be X(O2) < 1.2 x 10exp(-7) towards the Sgr A molecular belt region.

Affiliated with

Also associated with

No associations

Rating

Odin observations of the Galactic centre in the 118-GHz band. Upper limit to the O2 abundance does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Odin observations of the Galactic centre in the 118-GHz band. Upper limit to the O2 abundance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Odin observations of the Galactic centre in the 118-GHz band. Upper limit to the O2 abundance will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-369553