Large [OI]/[CO] ratios in cold molecular clouds towards W49N

Details Large [OI]/[CO] ratios in cold molecular clouds towards W49N Large [OI]/[CO] ratios in cold molecular clouds towards W49N

Nov 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000esasp.456..131v&link_type=abstract

ISO beyond the peaks: The 2nd ISO workshop on analytical spectroscopy. Eds. A. Salama, M.F.Kessler, K. Leech & B. Schulz. ESA-SP

Computer Science

Ism: Abundances, Ism:Molecules, Ism: Atoms, Ism: Molecular Clouds, Ism: Individual: W49N

Scientific paper

We present ISO-LWS high spectral resolution (R ~ 104) observations of the OI 63 μm and 145 μm lines towards the high mass star formation region W49N. At 145 μm the observed spectrum shows an emission component only, while at 63 μm it shows both emission and absorption components. We performed an analysis of the observed spectra using measured profiles of the LWS Fabry-Pérots spectral responses. We also present 12CO and 13CO J = 1 -> 0 and J = 2 -> 1 observations of the same line of sight and detected seven molecular clouds. We interpret the observed 63 μm OI line absorption as due to the OI associated with both atomic hydrogen clouds and molecular clouds present on the line of sight. We found that HI clouds are responsible only for a fraction of this absorption and that at least 15 times more OI than CO has to be present in the molecular clouds to reproduce the observed 63 μm absorption. This implies that the gaseous oxygen is almost totally in atomic form and that carbon is depleted by more than a factor six in these molecular clouds.

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