A study of the unidentified dust emission features near 10 microns

Astronomy and Astrophysics – Astronomy

Scientific paper

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Emission Spectra, Galactic Nuclei, Infrared Astronomy, Infrared Spectra, Interstellar Extinction, Planetary Nebulae, Interstellar Matter, Orion Nebula, Spectral Line Width, Stellar Envelopes

Scientific paper

From an examination of the published 8-13 micron spectra of galactic sources which show the unidentified emission features at 8.65 and 11.25 microns, and which are not heavily obscured, relationships between the feature equivalent widths and the depth of 10 micron minimum are established. Using these relationships a procedure is suggested for estimating extinction to objects whose 10 micron spectra are complicated by the presence of the features and the method is applied to the sample of 12 emission-line galaxy nuclei for which 10 micron spectra exist.

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