2003/04/23 by Aa. Sandqvist, P. Bergman, J. H. Black +37 · 2 citations
Physics and Astronomy · #Astro and Planetary Science #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #astro-ph
paper · pdf · doi:10.1051/0004-6361:20030341
published as Astron.Astrophys. 402 (2003) L63-L68 · 5 pages, 3 figures, accepted by A&A, special Odin Letters issue
openalex publication_date 2003/04/23 · arxiv created 2003/05/21 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
The Odin satellite has been used to detect emission and absorption in the 557-GHz HO line in the Galactic Centre towards the SgrA * Circumnuclear Disk (CND), and the SgrA +20 km s -1 and +50 km s -1 molecular clouds. Strong broad H 2 O emission lines have been detected in all three objects. Narrow H 2 O 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 H 2 O 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 ≈ +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 * CND. The 548-GHz HO isotope line towards the CND is not detected at the 0.02 K (rms) level.