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Grain-Grain Coagulation in the ISM

Published online by Cambridge University Press:  25 September 2002

M. Giard ,
J.P. Bernard ,
A. Klotz ,
I. Ristorcelli ,
B. Stepnik ,
A. P. Jones ,
A. Abergel ,
J. P. Bernard ,
F. Boulanger  and
I. Ristorcelli
B. Stepnik
Affiliation:
IAS, bâtiment 121, Université Paris XI, 91405 Orsay, France CESR, 9 avenue Colonel Roche, BP. 4346, 31028 Toulouse, France
A. P. Jones
Affiliation:
IAS, bâtiment 121, Université Paris XI, 91405 Orsay, France
A. Abergel
Affiliation:
IAS, bâtiment 121, Université Paris XI, 91405 Orsay, France
J. P. Bernard
Affiliation:
IAS, bâtiment 121, Université Paris XI, 91405 Orsay, France
F. Boulanger
Affiliation:
IAS, bâtiment 121, Université Paris XI, 91405 Orsay, France
I. Ristorcelli
Affiliation:
CESR, 9 avenue Colonel Roche, BP. 4346, 31028 Toulouse, France
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Abstract

We have developed a dust emission model in order to reproduce the evolution of the far-infrared (FIR) to sub-millimetre (sub-mm) dust emission properties which is observed in the transition between the diffuse and the dense interstellar medium (ISM). We propose that the coagulation of grains into fluffy aggregates could be the process responsible for the observed dust evolution from the diffuse to the dense ISM in the Galaxy. In dense clouds, dust coagulation can explain the increase in grain size, the decrease in the grain temperature in excess of that predicted by extinction, the sub-mm emissivity excess and the decrease in the small grain abundance.

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. 31
Copyright
© EAS, EDP Sciences, 2002

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