Variation of the FIR/submm optical properties of silicate dust analogues at low temperature: implications for the observations of interstellar cold dust emission

K. Demyk; C. Meny; A. Coupeaud; C. Nayral; H. Leroux; C. Depecker; G. Creff; J.-B. Brubach; P. Roy

doi:10.1051/eas/1258069

All issues

Volume 58 (2012)

EAS Publications Series, 58 (2012) 405-408

Abstract

Open Access

Issue		EAS Publications Series Volume 58, 2012 ECLA - European Conference on Laboratory Astrophysics


Page(s)		405 - 408
DOI		https://doi.org/10.1051/eas/1258069
Published online		13 February 2013

European Conference on Laboratory Astrophysics - ECLA
C. Stehlé, C. Joblin and L. d’Hendecourt (eds)
EAS Publications Series, 58 (2012) 405-408

Variation of the FIR/submm optical properties of silicate dust analogues at low temperature: implications for the observations of interstellar cold dust emission

K. Demyk¹, C. Meny¹, A. Coupeaud², C. Nayral³, H. Leroux¹, C. Depecker⁴, G. Creff¹, J.-B. Brubach¹ and P. Roy⁵

¹ Université de Toulouse, UPS-OMP, IRAP, Toulouse, France
² CNRS, IRAP, 9 avenue colonel Roche, BP. 44346, 31028 Toulouse Cedex 4, France
³ Université de Toulouse, INSA, CNRS, LPCNO, 31077 Toulouse, France
⁴ UMET, UMR 8207, Université Lille 1, CNRS, 59655 Villeneuve d’ Ascq, France
⁵ Ligne AILES – Synchrotron SOLEIL, L’Orme des Merisiers, 91192 Gif-sur-Yvette, France

Abstract

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