Computer Science
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.427..703l&link_type=abstract
The Universe as Seen by ISO. Eds. P. Cox & M. F. Kessler. ESA-SP 427., p. 703
Computer Science
1
Ism, Molecular Clouds, Ρ Ophiuchi Cloud, Pdrs, Star Formation
Scientific paper
The dense cores B 1, B 2 and C North in the active star forming ρ Oph cloud have been observed with the ISO LWS (λ = 43-197 μm, R=140-330). Detailed modelling of the Fir spectra shows that the emission originates in a PDR on the rear side of the cloud. However, the behaviour of the O i ground state lines (oishort, oilong) appears anomalous in the sense that observed flux ratios are too small compared to those predicted by theoretical models of O i excitation and line transfer. Based on the LWS data, we argue that self absorption in the oishort\ line by cool foreground material is not a viable explanation in the case of ρ Ophiuchi: the expected reduction in oishort\ flux towards the dense cores is not reflected by the data. In contrast, the ţwo\ and oishort\ lines behave in accordance with model predictions. It seems likely, therefore, that it is not the oishort\ line being too weak, but that the oilong\ line is relatively too strong and we propose that slight masing in the oilong\ line is responsible for the observed line ratio anomaly.
Larsson Bengt
Liseau Rene
White Glen J.
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