Physics – Condensed Matter
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.255..243d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 255, March 15, 1992, p. 243-247. Research supported by
Physics
Condensed Matter
7
Interstellar Extinction, Interstellar Matter, Near Infrared Radiation, Condensed Matter Physics, Cosmic Dust, Optical Properties
Scientific paper
It is found that the wavelength dependence of interstellar extinction between the 0.44-micron band an 8 microns follows a Tauc-Urbach law characteristic of amorphous semiconductors. This result implies that the majority of extinction in this wavelength range arises predominantly from an amorphous dust component. A comparison between laboratory and interstellar data suggests that this dust is likely to be amorphous carbon. The Tauc-Urbach dependence permits the ratio of total to selective extinction R(V) to be related to the optical properties of this dust component and provides a semiquantitative relation between R(V) and environmental conditions in the interstellar medium. It also supports an important connection between the physics of condensed matter and the optics of interstellar dust.
Duley Walter W.
Whittet Doug C. B.
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