Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..897h&link_type=abstract
Astrophysical Journal, Part 1, vol. 234, Dec. 15, 1979, p. 897-901.
Astronomy and Astrophysics
Astronomy
3
Astronomical Spectroscopy, Hydrogen Clouds, Infrared Astronomy, Interstellar Matter, Radio Sources (Astronomy), Supernova Remnants, Cosmic Dust, Far Infrared Radiation, Infrared Spectroscopy, Silicates
Scientific paper
Far-infrared lamellar grating observations of W 49 and W 51 obtained from the Kuiper Airborne Observatory are presented. These spectra (from 45 to 250 microns), in combination with previously published data, are interpreted in terms of simple spectral or slab models. A good but nonunique spherical fit to the W 49 spectrum is given by a dust density decreasing as the inverse of the radial distance, the dust absorption cross section proportional to the inverse of the wavelength to the 1.25 power, a dust temperature of 30 K, and central optical depth at 100 microns of approximately 2.6. For W 51 it is concluded that the nebula is at a dominant temperature of 50 K, with central optical depth at 100 microns of approximately 0.12. The long-wavelength data for both regions are consistent with dust composed of amorphous silicate, as previously proposed.
Duthie Graeme J.
Herter Terry
Pipher Judith L.
Savedoff Malcolm P.
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