Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87.1810b&link_type=abstract
Astronomical Journal, vol. 87, Dec. 1982, p. 1810-1818. Research supported by the University of Wyoming and NSF.
Astronomy and Astrophysics
Astronomy
31
Emission Spectra, Hydrogen Clouds, Infrared Astronomy, Interstellar Matter, Spatial Distribution, Astronomical Catalogs, Astronomical Maps, Ionizing Radiation, Spectral Bands
Scientific paper
NGC 7027 was mapped in each of five spectral bands between 8.7 and 23 microns with a spatial resolution of 3.5 arcsec. Two new scientific results are presented: (1) analysis of the observations shows that the dust in NGC 7027 contains two spatially distinct components, one of which is associated with and links the unidentified emission features at 8.6 and 11.3 microns; the second component may be graphite, (2) high-quality observations indicate that thermal emission by dust in NGC 7027 is spatially coextensive with emission by ionized hydrogen over a broad spectral range in the midinfrared (about 8-28 microns). No significant emission above the 1% level was found outside the region of ionized hydrogen in any spectral band observed. The intensity distribution of the observed infrared emission was successfully modeled by emission from within the walls of a hollow cylinder, similar to the model for 5-GHz radio emission proposed by Scott (1973).
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