Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977natur.268..610h&link_type=abstract
Nature, vol. 268, Aug. 18, 1977, p. 610-612.
Astronomy and Astrophysics
Astronomy
59
Infrared Astronomy, Infrared Spectra, Interstellar Matter, Polysaccharides, Transmittance, Cellulose, Formaldehyde, Ice, Interstellar Gas, Silicates
Scientific paper
Infrared observations in the range 2 to 30 microns for a number of astronomical objects are shown to be consistent with the transmittance properties of polysaccharides. The abundance of H2CO in the interstellar medium is cited, and the possible evolution of fragile molecules such as formaldehyde into relatively stable polysaccharides resistant to the alternating compression and evaporation phases of interstellar gas is discussed. Transmittance data for cellulose, together with a smoothed spectrum accounting for an ensemble of related polysaccharides, are given. These data are compared with the infrared emissivity spectrum of the Trapezium Nebula and to adjusted spectra from several other astronomical sources. The correlation between the polysaccharide transmittance spectrum and the spectral data from the astronomical objects suggests that the presence of polysaccharides in the interstellar medium may better account for observed infrared absorption bands than the hypothesized mixture of water-ice particles and magnesium-silicate grains.
Hoyle Fiona
Wickramasinghe Chandra N.
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