Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...277..609b&link_type=abstract
Astronomy and Astrophysics, Vol. 277, NO. 2/OCT(I), P. 609, 1993
Astronomy and Astrophysics
Astrophysics
69
Infrared: Interstellar: Continuum - Ism: Clouds - Ism: Abundances - Ism: Individual Objects: Chamaeleon, Ophiuchi - Ism: Dust, Extinction
Scientific paper
A numerical model was developed to compute the penetration of heating radiation inside molecular clouds and the resulting IR emission of dust when thermal fluctuations of small dust particles is considered. It has been used to investigate physical conditions of some selected clouds heated either by the galactic diffuse Inter Stellar Radiation Field (IS RE) or receiving radiation from nearby young stars. The individual clouds studied were selected among those showing short IRAS wavelengths Limb Brightening (LB) effect. The model used allows to quantify the abundance variations of the smallest dust components which are necessary, inside the clouds, to reproduce the spatial structure of the IR emission. For the clouds where IR brightness profiles can be used reliably down to the cloud center, it is found that the smallest dust particles must be present only in a halo surrounding the cloud. This conclusion is reached both for isolated clouds and nearby recently formed stars. The inner position of the halo is found to be at a visible extinction of ≃0.5 mag independent of the external radiation field, indicating that some other physical parameters may be responsible for the halo. Several hypotheses are examined. The comparison with 13CO emission data also shows that a substantial amount of dust is present in the limb brightening region where no 13CO is observed with the current available sensitivity. The use of an IR emission model allows us to determine the cloud density distribution in these regions.
Bernard J.-Ph.
Boulanger Francois
Puget Jean-Loop
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