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Astron. Astrophys. 343, L53-L56 (1999)

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Letter to the Editor

The molecular cloud core M 17-North: New ISOCAM observations *

R. Klein 1, Th. Henning 1 and D. Cesarsky 2

1 Astrophysical Institute and University Observatory (AIU), Schillergässchen 2-3, D-07745 Jena, Germany
2 Institut d'Astrophysique Spatiale, Bâtiment 121, Université de Paris-Sud, F-91405 Orsay Cedex, France

Received 8 January 1999 / Accepted 30 January 1999


We present spectro-imaging data of the molecular cloud core M17-North. The data have been obtained with the ISOCAM camera on board of the Infrared Space Observatory (ISO) using the circular variable filters (CVF). The spectra have a spectral resolution of about 40. They are dominated by PAH emission bands. A band at 16.6 µm is detected which is ascribed to the family of the PAH bands. Further, the PAH bands display clearly Lorentzian line profiles. The observations led to the detection of a new mid-infrared source with a very strongly rising continuum. The observed spatial distribution of fine structure line emission of neon and argon ions is a sign for an ionizing source in M 17-North.

Key words: stars: formation – ISM: clouds – ISM: individual objects: M 17-North – infrared: general

* 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) with the participation of ISAS and NASA.

Send offprint requests to: rklein@astro.uni-jena.de

© European Southern Observatory (ESO) 1999

Online publication: March 1, 1999