First interstellar detection of OH

@article{Wyrowski2010FirstID,
  title={First interstellar detection of OH},
  author={F. Wyrowski and K. Menten and R. Guesten and A. Belloche},
  journal={arXiv: Astrophysics of Galaxies},
  year={2010}
}
The Atacama Pathfinder Experiment (APEX) 12m telescope was used to observe the N=1-0, J=0-1 ground state transitions of OH+ at 909.1588 GHz with the CHAMP+ heterodyne array receiver. Two blended hyperfine structure transitions were detected in absorption against the strong continuum source Sagittarius B2(M) and in several pixels offset by 18". Both, absorption from Galactic center gas as well as absorption from diffuse clouds in intervening spiral arms in a velocity range from -116 to 38.5 km/s… Expand

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