Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242..965m&link_type=abstract
Astrophysical Journal, Part 1, vol. 242, Dec. 15, 1980, p. 965-975.
Astronomy and Astrophysics
Astronomy
42
Astronomical Spectroscopy, Galactic Nuclei, Infrared Astronomy, Infrared Spectra, Interstellar Extinction, Milky Way Galaxy, Cosmic Dust, Density Distribution, Galactic Structure, Interstellar Matter, Molecular Clouds, Silicates, Spatial Distribution
Scientific paper
Within the galactic center, ionized gas, stars, and heated dust are in close proximity to each other. Observations of the galactic center were made during two flight series on NASA aircraft flying at altitudes of more than 12 km. In both series the instrument used was a 10-channel liquid helium cooled grating spectrometer. Three 16-30 micrometers continuum spectra are presented along with two-color scans of the galactic center. No 18.71 micrometers line emission has been detected from Sgr A West. This is consistent with large dust extinction and normal S III/H II abundances. All three 16-30 micrometers continuum spectra show a broad depression centered at about 18 micrometers. This observation is attributed to absorption by cold silicate dust grains. The characteristics of a silicate model are discussed.
Briotta A. Jr. D.
Forrest William John
Houck James R.
McCarthy Joseph F.
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