Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...295..165m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 295, no. 1, p. 165-170
Astronomy and Astrophysics
Astrophysics
26
Absorptivity, Carbon, Cosmic Dust, Far Infrared Radiation, Morphology, Spectrum Analysis, Absorption Spectra, Optical Properties, Spectral Resolution, Spectrophotometers, Ultraviolet Spectra
Scientific paper
We have measured the mass absorption coefficient of various kinds of cosmic carbonaceous analog grains in the FIR-mm up to 2 mm. The samples do not present any relevant feature in this spectral range, but are characterized by two distinct spectral trends: the mainly amorphous grains show a spectral emissivity index, beta, close to 1, while for micronic graphite particles beta is equal to 2. The emissivity spectral behavior is discussed in terms of structural properties of the grains. The absorption coefficients obtained in this work represent a set of data useful to interpret a variety of FIR-mm astronomical observations and to better identify the actual properties of carbonaceous cosmic dust.
Bussoletti Ezio
Colangeli Luigi
Mennella Vito
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