Detection of [O I] 63 μm in absorption toward Sgr B2

Baluteau, J.-P.; Cox, P.; Cernicharo, J.; Péquignot, D.; Caux, E.; Lim, T.; Swinyard, B.; White, G.; Kessler, M.; Prusti, T.; Barlow, M.; Clegg, P. E.; Emery, R. J.; Furniss, I.; Glencross, W.; Gry, C.; Joubert, M.; Liseau, R.; Nisini, B.; Saraceno, P.; Serra, G.; Armand, C.; Burgdorf, M.; Digiorgio, A.; Molinari, S.; Price, M.; Texier, D.; Sidher, S. and Trams, N. (1997). Detection of [O I] 63 μm in absorption toward Sgr B2. Astronomy & Astrophysics, 322(3) L33-L36.



A high signal-to-noise 52-90 μm spectrum is presented for the central part of the Sagittarius B2 complex. The data were obtained with the Long Wavelength Spectrometer on board the Infrared Space Observatory (ISO). The [O I] 63 μm line is detected in absorption even at the grating spectral resolution of 0.29 μm. A lower limit for the column density of atomic oxygen of the order of 1019 cm-2 is derived. This implies that more than 40% of the interstellar oxygen must be in atomic form along the line of sight toward the Sgr B2 molecular cloud.

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