EAS Publications Series
Volume 4, 2002Infrared and Submillimeter Space Astronomy: An International Colloquium to Honor the Memory of Guy Serra
|Page(s)||309 - 309|
|Published online||25 September 2002|
M. Giard, J.P. Bernard, A. Klotz and I. Ristorcelli (eds)
EAS Publications Series, 4 (2002) 309
Evolution of interstellar dust properties from diffuse medium to a dense cloud
IAS, Bât. 121, Université Paris XI, 91405 Orsay, France
2 CESR, 9 avenue Colonel Roche, BP. 4346, 31028 Toulouse, France
3 IPAC, California Institue of Technology, Mail Code 100-22, CA 91125, USA
4 Service d'Aéronomie, BP. 3, 91371 Verrières-le-Buisson, France
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.
© EAS, EDP Sciences, 2002
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