A unified model for the 3.28 micron and 3.4 micron spectral feature in the interstellar medium and in comets

Details A unified model for the 3.28 micron and 3.4 micron spectral feature in the interstellar medium and in comets A unified model for the 3.28 micron and 3.4 micron spectral feature in the interstellar medium and in comets

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.290...67h&link_type=abstract

In ESA, Infrared Spectroscopy in Astronomy p 67-72(SEE N90-19084 11-89)

Astronomy and Astrophysics

Astronomy

1

Bandwidth, Comets, Infrared Spectra, Infrared Spectroscopy, Interstellar Matter, Hydrocarbons, Interplanetary Dust, Molecular Spectroscopy, Organic Compounds, Spectrum Analysis

Scientific paper

The 3.4 microns absorption feature seen in the spectra of GCIRS7 is shown to be of interstellar rather than circumstellar origin. The implication is that a large fraction of interstellar grains are organic in character. The 3.28 microns feature seen in emission in planetary nebulae is most likely due to aromatic hydrocarbons which are released as degradation products of organic grains. The same aromatic molecules can also explain the 2200 angstroms interstellar extinction feature. The detailed 2.8 to 3.6 microns profiles of IRS7 can be explained on the basis of grains comprised of material closely resembling biogenic matter in their disposition of CH linkages. Dust particles possessing the same detailed spectral characteristics as the interstellar grains are able to match infrared spectra obtained for Halley's comet.

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