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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
2 Radioastronomie millimétrique, Ecole Normale Supérieure, 24 rue Lhomond, F-75005 Paris, France
3 Max Planck Institut für extraterristrische Physik, Postfach 1603, D-85740 Garching, Germany

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 img1.gifm 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.

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