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  • ASTROPHYSICS  (3)
  • 1
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    More interstellar emission features at 3.3-3.6 micrometers! (1986)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The present data set consists of 3.20 to 3.55 micron spectra of HD44179, NGC 7027, BD+30 3639, and Elias 1 obtained with a cooled-grating array spectrometer (CGAS) at the NASA Infrared Telescope Facility. Emission features and details of the emission feature profiles are presented for high resolution spectra. Greater complexity is shown than might be expected. It is significant that the 3.29 micron feature has an invariant central wavelength, even at high resolution, and this strongly supports the case for a very specific substance or mixture of substances which is giving rise to this feature.
    Keywords: ASTROPHYSICS
    Type: NASA. Ames Research Center Summer School on Interstellar Processes: Abstracts of Contributed Papers; p 115-116
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Quenched carbonaceous composite. III - Comparison to the 3.29 micron interstellar emission feature (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Laboratory data are presented showing that oxidized f-QCC, after heating to 500 C, has a 3.29 micron absorption feature that matches precisely the wavelength of the 3.29 micron interstellar emission feature. In addition, the width of the f-QCC (filmy quenched carbonaceous composite) feature is close to that of the 3.29 micron emission feature observed in NGC 7027, Orion, and IRAS 21282 + 5050. Laboratory spectra of polycyclic aromatic hydrocarbons (PAHs) were also obtained, and comparison of the f-QCC and PAH absorption spectra to that of the 3.29 micron emission feature indicates that the f-QCC provides a much better match. It is thus suggested that f-QCC is representative of the class of material giving rise to the emission features in the interstellar medium.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 353; 543-548
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Trapped H2O in SiO condensate - An explanation for the 3 micron band observed toward the Galactic center (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: An SiO condensate containing trapped and adsorbed H2O was produced in the laboratory. The SiO condensate is not a silicate; it is an amorphous silicon suboxide material. The micron absorption of trapped H2O in this condensate matches very closely the 3 micron absorption band of the Galactic center source IRS 7.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 375; L17-L20
    Format: text
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    NASA TECHNICAL REPORTS
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