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Variation of the FIR/submm optical properties of silicate dustanalogues at low temperature: implications for the observations of interstellar cold dustemission

Published online by Cambridge University Press:  13 February 2013

K. Demyk ,
C. Meny ,
A. Coupeaud ,
C. Nayral ,
H. Leroux ,
C. Depecker ,
G. Creff ,
J.-B. Brubach  and
P. Roy
K. Demyk
Affiliation:
Université de Toulouse, UPS-OMP, IRAP, Toulouse, France
C. Meny
Affiliation:
Université de Toulouse, UPS-OMP, IRAP, Toulouse, France
A. Coupeaud
Affiliation:
CNRS, IRAP, 9 avenue colonel Roche, BP. 44346, 31028 Toulouse Cedex 4, France
C. Nayral
Affiliation:
Université de Toulouse, INSA, CNRS, LPCNO, 31077 Toulouse, France
H. Leroux
Affiliation:
Université de Toulouse, UPS-OMP, IRAP, Toulouse, France
C. Depecker
Affiliation:
UMET, UMR 8207, Université Lille 1, CNRS, 59655 Villeneuve d’Ascq, France
G. Creff
Affiliation:
Université de Toulouse, UPS-OMP, IRAP, Toulouse, France
J.-B. Brubach
Affiliation:
Université de Toulouse, UPS-OMP, IRAP, Toulouse, France
P. Roy
Affiliation:
Ligne AILES – Synchrotron SOLEIL, L’Orme des Merisiers, 91192 Gif-sur-Yvette, France

Abstract

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We present here the latest results from experimental studies aiming at measuring the MassAbsorption Coefficient (MAC) of interstellar silicate dust analogues at low temperaturesin the far infrared and submillimetre domains which are necessary for the analysis ofastronomical data. These results show that above 100 μm, the MAC ofamorphous silicate nano-grains has a complex dependence with the grain temperature andwith the wavelength. This has to be considered when interpreting astronomical observationsto avoid errors on the derived parameters such as the dust mass and its physical andchemical properties.

References

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