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The evolution of very small dust particles in molecular clouds observed with ISOCAM

Published online by Cambridge University Press:  25 September 2002

M. Giard ,
J.P. Bernard ,
A. Klotz ,
I. Ristorcelli ,
A. Abergel ,
J. P. Bernard ,
F. Boulanger ,
D. Cesarsky ,
A. P. Jones  and
J.-L. Puget
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A. Abergel
Affiliation:
Institut d'Astrophysique Spatiale, UMR-8617, Université Paris-Sud, Bât. 121, 91405 Orsay, France
J. P. Bernard
Affiliation:
Institut d'Astrophysique Spatiale, UMR-8617, Université Paris-Sud, Bât. 121, 91405 Orsay, France
F. Boulanger
Affiliation:
Institut d'Astrophysique Spatiale, UMR-8617, Université Paris-Sud, Bât. 121, 91405 Orsay, France
D. Cesarsky
Affiliation:
Institut d'Astrophysique Spatiale, UMR-8617, Université Paris-Sud, Bât. 121, 91405 Orsay, France
A. P. Jones
Affiliation:
Institut d'Astrophysique Spatiale, UMR-8617, Université Paris-Sud, Bât. 121, 91405 Orsay, France
J.-L. Puget
Affiliation:
Institut d'Astrophysique Spatiale, UMR-8617, Université Paris-Sud, Bât. 121, 91405 Orsay, France
M.-A. Miville-Deschênes
Affiliation:
Institut d'Astrophysique Spatiale, UMR-8617, Université Paris-Sud, Bât. 121, 91405 Orsay, France
L. Nordh
Affiliation:
Stockholm Observatory, 133 36 Saltsjöbaden, Sweden
G. Olofsson
Affiliation:
Stockholm Observatory, 133 36 Saltsjöbaden, Sweden
A.A. Kaas
Affiliation:
Stockholm Observatory, 133 36 Saltsjöbaden, Sweden
M. Huldtgren
Affiliation:
Stockholm Observatory, 133 36 Saltsjöbaden, Sweden
E. Falgarone
Affiliation:
Radioastronomie Millimétrique, ENS, 24 rue Lhomond, 75005 Paris, France
M. Pérault
Affiliation:
Radioastronomie Millimétrique, ENS, 24 rue Lhomond, 75005 Paris, France
P. André
Affiliation:
Service d'Astrophysique, Centre d'Études de Saclay, 91191 Gif-sur-Yvette Cedex, France
T. Montmerle
Affiliation:
Service d'Astrophysique, Centre d'Études de Saclay, 91191 Gif-sur-Yvette Cedex, France
C. J. Cesarsky
Affiliation:
Service d'Astrophysique, Centre d'Études de Saclay, 91191 Gif-sur-Yvette Cedex, France
P. Persi
Affiliation:
Istituto Astrofisica Spaziale, CNR, Area di Ricerca Tor Vergata, Roma, Italy
S. Bontemps
Affiliation:
Observatoire de Bordeaux, BP. 89, 33270 Floirac, France
F. Sibille
Affiliation:
Observatoire de Lyon, France
M. M. Casali
Affiliation:
Royal Observatory, Blackford Hill, Edinburgh, UK
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Abstract

We present ISOCAM observations (5-18 μm) of illuminated surfaces of molecular clouds. The emission properties of the transiently heated small particles, which dominate the emission observed by ISOCAM, are analysed in relation with the spatial structure of the material. Striking spatial variations of the infrared colour (5-8.5 μm/12-18 μm) are detected. Spectroscopic observations show that they are due to variations of the intensity of the aromatic features (especially at 7.7 μm) relatively to the continuum emission increasing towards long wavelengths. Compared to the intensity of the continuum emission, the intensity of the aromatic features are significantly fainter at the illuminated surfaces of dense structures than in low density regions surrounding these dense structures. This effect could be the signature of photo-chemical evolution, size segregation due to grain dynamics in uni-directional radiation fields, or abundance variations of very small particles.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 4: Infrared and Submillimeter Space Astronomy: An International Colloquium to Honor the Memory of Guy Serra , 2002 , pp. 79
Copyright
© EAS, EDP Sciences, 2002

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