Astron. Astrophys. 315, L337-L340 (1996)
SWS spectroscopy of small grain features across the M17-Southwest photodissociation front*
L. Verstraete1, J.L. Puget1, E. Falgarone2, S. Drapatz3, C.M. Wright3, and R. Timmermann3
1 Institut d'Astrophysique Spatiale, Université
Paris-Sud, Bât.121, F-91405 Orsay, France
Received 15 July 1996 / Accepted 30 August 1996
Abstract. We present SWS spectra taken across the M17-Southwest photodissociation front and discuss spectral properties of PAHs and VSGs. We report new features at 4.65, 6.35, 8.7 and 11 m which we interpret as PAHs and/or VSGs emission. From feature intensity ratios along the cut, we find PAHs are mainly ionized and almost fully hydrogenated.
Key words: ISM: molecules - ISM: dust - ISM: molecular cloud, HII region
* Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France Germany, the Netherlands and the United Kingdom) and with the participation of ISAS and NASA.
Last change: December 16, 1996