We present spectroscopic and imaging observations of dust and gas emission from the western edge of the ρ Ophiuchi molecular cloud facing the B2 star HD 147889. The emission from dust heated by the external UV radiation, from collisionally excited and fluorescent H2 are resolved and observed to coincide spatially. The spectroscopic data allows to estimate the gas temperatur e to 350 ± 30 K in the H2 emitting layer. In the framework of a physical model where the local abundance of H2 is the equilibrium value set by formation and photo-dissociation, a high formation rate 2 10-16 cm3 s-1 at 350 K, seems to be required to account for the observed emission.
ISO Beyond the Peaks: The 2nd ISO Workshop on Analytical Spectroscopy
- Pub Date:
- November 2000