Interstellar CH absorption in the diffuse interstellar medium along the sight-lines to G10.6-0.4 (W31C), W49N, and W51
- Gerin, M.
- De Luca, M.
- Goicoechea, J. R.
- Herbst, E.
- Falgarone, E.
- Godard, B.
- Bell, T. A.
- Coutens, A.
- Kazmierczak, M.
- Sonnentrucker, P.
- Black, J. H.
- Neufeld, D. A.
- Phillips, T. G.
- Pearson, J.
- Rimmer, P. B.
- Hassel, G.
- Lis, D. C.
- Vastel, C.
- Boulanger, F.
- Cernicharo, J.
- Dartois, E.
- Encrenaz, P.
- Giesen, T.
- Goldsmith, P. F.
- Gupta, H.
- Gry, C.
- Hennebelle, P.
- Hily-Blant, P.
- Joblin, C.
- Kolos, R.
- Krelowski, J.
- Martin-Pintado, J.
- Monje, R.
- Mookerjea, B.
- Perault, M.
- Persson, C.
- Plume, R.
- Salez, M.
- Schmidt, M.
- Stutzki, J.
- Teyssier, D.
- Yu, S.
- Contursi, A.
- Menten, K.
- Geballe, T. R.
- Schlemmer, S.
- Morris, P.
- Hatch, W. A.
- Imram, M.
- Ward, J. S.
- Caux, E.
- Guesten, R.
- Klein, T.
- Roelfsema, P.
- Dieleman, P.
- Schieder, R.
- Honingh, N.
- Zmuidzinas, J.
DOIAbstract
We report the detection of the ground state N, J = 1, 3/2 -> 1, 1/2 doublet of the methylidyne radical CH at similar to 532 GHz and similar to 536 GHz with the Herschel/ HIFI instrument along the sight-line to the massive star-forming regions G10.6-0.4 (W31C), W49N, and W51. While the molecular cores associated with these massive star-forming regions show emission lines, clouds in the diffuse interstellar medium are detected in absorption against the strong submillimeter background. The combination of hyperfine structure with emission and absorption results in complex profiles, with overlap of the different hyperfine components. The opacities of most of the CH absorption features are linearly correlated with those of CCH, CN, and HCO+ in th...
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