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

Stepnik, B. and Abergel, A. and Bernard, J. P. and Boulanger, F. and Cambrésy, L. and Giard, M. and Jones, A. P. and Lagache, G. and Lamarre, J.-M. and Mény, C. and Pajot, F. and Le Peintre, F. and Ristorcelli, I. and Serra, G. and Torre, J.-P. (2002) Evolution of interstellar dust properties from diffuse medium to a dense cloud. EAS Publications Series, 4 . p. 309. ISSN 1633-4760. doi:10.1051/eas:2002093.

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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 n_H > 3 ± 1 × 10^3 cm^(-3), A_V > 2.1 ± 0.5). This induces a deficit in the IRAS I_(60) μm/I_(100 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.

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Additional Information:© 2002 EAS, EDP Sciences. Published online 25 September 2002.
Record Number:CaltechAUTHORS:20180207-132705731
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Official Citation:Evolution of interstellar dust properties from diffuse medium to a dense cloud B. Stepnik, A. Abergel, J. P. Bernard, F. Boulanger, L. Cambrésy, M. Giard, A. P. Jones, G. Lagache, J.-M. Lamarre, C. Meny, F. Pajot, F. Le Peintre, I. Ristorcelli, G. Serra, J.-P. Torre. EAS Publications Series 4 309 (2002). DOI: 10.1051/eas:2002093
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:84724
Deposited By: Tony Diaz
Deposited On:08 Feb 2018 21:21
Last Modified:15 Nov 2021 20:22

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