NGC 7027: analysis of 7.8–20 micron continuum,silicate and PAH grain distributions |
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| Authors: | D Y Gezari M D Thornley F Varosi |
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| Institution: | 1. Infrared Astrophysics Branch, Code 685, NASA/Goddard Space Flight Center, 20771, Greenbelt, MD, USA
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| Abstract: | Images of mid-infrared (5 - 20µm) circumstellar dust sources have been obtained with a new 58 × 62 pixel infrared array camera system. A seven-color imaging study of the bright planetary nebula NGC 7027 challenges the assertion that polycyclic aromatic hydrocarbons (PAH) may extend further from the center of the nebula than the continuum emission from silicate dust grains. It appears that the overall distributions are nearly identical, ruling out differences in intensity between the PAH emission and the general “silicate” dust material. A rigorous comparison between the infrared image data and new visible CCD images of NGC 7027 is made. |
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