Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...207..763m&link_type=abstract
Astrophysical Journal, vol. 207, Aug. 1, 1976, pt. 1, p. 763-769. NSF-NASA-supported research.
Astronomy and Astrophysics
Astronomy
173
Ice, Infrared Astronomy, Interstellar Matter, Molecular Absorption, Silicates, Absorption Spectra, Ammonia, Electromagnetic Absorption, Interstellar Extinction, Mie Scattering, Solid Phases, Water
Scientific paper
Spectrophotometric observations from 2 to 4 microns and from 8 to 13 microns of several infrared sources associated with molecular clouds are reported. Narrow absorption features at 3.08 microns, attributed to interstellar ices, appear in all sources with a molecular cloud in the intervening line of sight. All sources showing ice absorptions also show broad absorption features, attributed to cold silicates, from 8 to 13 microns. The observed ice absorption profiles are all quite similar; however, they do not fit in detail Mie theory predictions of extinction for pure H2O or NH3 ices. The ratio of ice-to-silicate optical depths is found to vary, with most sources showing a ratio in the range 0.1-0.4. The ratio of visual extinction to ice absorption is found to increase rapidly from inside to outside the molecular cloud in NGC 2024.
Merrill Michael K.
Russell Ray W.
Soifer Thomas B.
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