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Evolution of interstellar dust properties from diffuse medium to a dense cloud

Published online by Cambridge University Press:  25 September 2002

B. Stepnik
Affiliation:
IAS, Bât. 121, Université Paris XI, 91405 Orsay, France CESR, 9 avenue Colonel Roche, BP. 4346, 31028 Toulouse, France
A. Abergel
Affiliation:
IAS, Bât. 121, Université Paris XI, 91405 Orsay, France
J. P. Bernard
Affiliation:
IAS, Bât. 121, Université Paris XI, 91405 Orsay, France
F. Boulanger
Affiliation:
IAS, Bât. 121, Université Paris XI, 91405 Orsay, France
L. Cambrésy
Affiliation:
IPAC, California Institue of Technology, Mail Code 100-22, CA 91125, USA
M. Giard
Affiliation:
CESR, 9 avenue Colonel Roche, BP. 4346, 31028 Toulouse, France
A. P. Jones
Affiliation:
IAS, Bât. 121, Université Paris XI, 91405 Orsay, France
G. Lagache
Affiliation:
IAS, Bât. 121, Université Paris XI, 91405 Orsay, France
J.-M. Lamarre
Affiliation:
IAS, Bât. 121, Université Paris XI, 91405 Orsay, France
C. Meny
Affiliation:
CESR, 9 avenue Colonel Roche, BP. 4346, 31028 Toulouse, France
F. Pajot
Affiliation:
IAS, Bât. 121, Université Paris XI, 91405 Orsay, France
F. Le Peintre
Affiliation:
IAS, Bât. 121, Université Paris XI, 91405 Orsay, France
I. Ristorcelli
Affiliation:
CESR, 9 avenue Colonel Roche, BP. 4346, 31028 Toulouse, France
G. Serra
Affiliation:
CESR, 9 avenue Colonel Roche, BP. 4346, 31028 Toulouse, France
J.-P. Torre
Affiliation:
Service d'Aéronomie, BP. 3, 91371 Verrières-le-Buisson, France
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Abstract

The balloon borne experiment PRONAOS has measured the sub-millimetre emission from the diffuse interstellar medium to a quiescent filament in the Taurus molecular cloud. We model the output emission of this filament using a radiative transfer code and an independent tracer of the total column density (near infrared extinction). We show that inside the filament the transiently heated particles responsible of the 60 μm emission are removed and the dust sub-millimetre emissivity is increased by a significant factor, 3.4+0.3-0.7 (for typically nH > 3 ± 1 × 103 cm-3, AV > 2.1 ± 0.5). This induces a deficit in the IRAS I60 μm/I100 μm flux ratio in comparison with the diffuse interstellar medium and a decrease of the grain equilibrium temperature in excess to that predicted by extinction.

Type
Research Article
Copyright
© EAS, EDP Sciences, 2002

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