Low temperature FIR and submm opacity of interstellar silicate dust analogs: experimental variation of the emissivity spectral index with the wavelength and temperature

Details Low temperature FIR and submm opacity of interstellar silicate dust analogs: experimental variation of the emissivity spectral index with the wavelength and temperature Low temperature FIR and submm opacity of interstellar silicate dust analogs: experimental variation of the emissivity spectral index with the wavelength and temperature

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.138c&link_type=abstract

The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The far infrared and submillimeter emission of the cold Interstellar Medium iis dominated by grains of size of the order of few hundreds of nanometers, mostly composed of silicates and oxides. These cold grains radiate at thermal equilibrium following a blackbody modified emission expressed as : I(λ) = Md. κ(λ0). (λ/λ0)-β. B(λ,T)} with I(λ) is the spectral intensity, Bλ(T) the Planck function at the dust temperature, Md the mass of dust along the line of sight, κ the mass absorption coefficient and β the emissivity spectral index. The simple classical models provide a temperature independent asymptotic behaviour for the dust emissivity and predict a single value for β equals to 2. The first results of the Herschel mission and the Planck early results papers show that the value of the spectral index often deviates from the classical value of 2 and confirm the β-T anti-correlation in different environnements. We present an experimental study dedicated to the variations of the optical properties of interstellar dust analogs (magnesium rich silicates) in the far infrared and submillimeter spectral range (100-1500 μm) as a function of the temperature (300-10K). These experimental results emphasise the fact that adopting for the dust opacity a power law characterised by a single spectral index independent of the wavelength and the grain temperature is not appropriate and induces significant errors on the derived physical parameters such as the dust temperature and masses.

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