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- Persson, Carina, 1964, et al.
(författare)
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From Molecular Oxygen to Primordial Molecules with the Odin Satellite
- 2008
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Ingår i: Proceedings in Astronomical Society of the Pacific Conference Series "Frontiers of Astronomy", NRAO 50th Anniversary Science Symposium, eds. A. Bridle, J. Condon and G. Hunt.. - 9781583816608 ; 395, s. 378-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Odin is a mm/submm-wave-spectroscopy Astronomy and Aeronomy satellite. Its design life time was two years, but it has now operated successfully for more than six years. Its 1.1 m high-precision telescope, with a beam efficiency of 90%, has beamwidths of 10 arcmin and 2 arcmin at mm and submm wavelengths, respectively. It is equipped with a cryogenic receiver package of four tunable, SSB, submm Schottky mixers covering the 486-504 and 541-581 GHz frequency range, and a fixed-tuned HEMT receiver at a frequency of 118-119 GHz.Odin has discovered the elusive oxygen (O2) molecule at 119 GHz - the detection was made in the ρ Oph A molecular-cloud core. The O2 abundance, X(O2), is ≈5×10^{-8} - Larsson et al. (2007: A&A, 466, 999). Odin has also discovered water (H2O) at 557 GHz in the core of the Milky Way Galaxy - the Sgr A CircumNuclear Disk (CND)- and mapped its distribution in the Sgr A Complex including the +20 and +50 km s-1 Molecular Clouds - Sandqvist et al. (2006: J.Phys. Conf.Ser., 54, 72). Furthermore, devoting about 1,100 orbits (each of which contains 1 hour of observable astronomy time) Odin has performed a spectral-line survey of Orion KL in the ranges 487-492 and 542-577 GHz. There are 280 identified spectral lines from 38 species and 64 unidentified lines [Olofsson et al. (2007: A&A, 476, 791) and Persson et al. (2007: A&A, 476, 807)].Odin has searched for emission from the 557 GHz ortho-H2O line in six nearby starburst galaxies yielding three-sigma upper limits to the water abundance relative to H2 (NGC253 -
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