Molecular oxygen in the ρ Ophiuchi cloud

  title={Molecular oxygen in the $\rho$ Ophiuchi cloud},
  author={Bengt Larsson and Ren{\'e} Liseau and Laurent Pagani and Per Bergman and Peter F. Bernath and Nicolas Biver and John H. Black and R S Booth and V{\'e}ronique Buat and Jacques Crovisier and Charles L. Curry and Magnus Dahlgren and Pierre J. Encrenaz and Edith Falgarone and Paul A. Feldman and Michel Fich and H. G. Flore'n and Mathias Fredrixon and Urban Frisk and G. F. Gahm and Maryvonne Gerin and M. Hagstroem and Jorma Harju and Tetsuo Hasegawa and Aa. Hjalmarson and C. Horellou and Lars E. B. Johansson and K. Justtanont and Alain Klotz and E. Kyroelae and Sun Kwok and Alain Lecacheux and T. Liljestroem and Edward J. Llewellyn and S. Lundin and G. Me'gie and George Francis Mitchell and Donal P. Murtagh and Lennart Nordh and L. A. Nyman and Michael Olberg and A. O. Henrik Olofsson and G{\"o}ran Olofsson and H. Olofsson and Glenn Persson and Rene Plume and Hans Rickman and Isabelle Ristorcelli and Gustaf Rydbeck and Aa. Sandqvist and F.v. Sche'ele and Guy Serra and Steve A. Torchinsky and N. Tothill and Kevin Volk and Tommy Wiklind and C. D. Wilson and Anders Winnberg and Georg Witt},
  journal={Astronomy and Astrophysics},
Context: Molecular oxygen, O2, has been expected historically to be an abundant component of the chemical species in molecular clouds and, as such, an important coolant of the dense interstellar medium. However, a number of attempts from both ground and from space have failed to detect O2 emission.Aims: The work described here uses heterodyne spectroscopy from space to search for molecular oxygen in the interstellar medium. Methods: The Odin satellite carries a 1.1 m sub-millimeter dish and a… 

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