8 to 13 micron spectrophotometry of compact sources in NGC 7538

Details 8 to 13 micron spectrophotometry of compact sources in NGC 7538 8 to 13 micron spectrophotometry of compact sources in NGC 7538

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..728w&link_type=abstract

Astrophysical Journal, vol. 206, June 15, 1976, pt. 1, p. 728-734.

Astronomy and Astrophysics

Astronomy

59

Astronomical Spectroscopy, Infrared Spectra, Radio Sources (Astronomy), Spectrophotometry, Absorption Spectra, Hydrogen Clouds, Silicates, Spectral Resolution

Scientific paper

Three infrared and radio sources in NGC 7538 have been observed with 1% spectral and 5-arcsec spatial resolution. The very small southern source shows a deep silicate absorption feature at 9.7 microns, while the northern extended source shows little or no silicate absorption, but has a 12.8-micron emission line from Ne II. The data imply that the compact source has a gas-to-dust ratio of 75 inside the ionized region. The extended source only 10 arcsec away has a gas-to-dust ratio implied by the 10-micron data alone of 30,000, but the true ratio must be much lower to account for published 20-micron measurements.

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