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Scattering of infrared radiation by dust in NGC 7023 and NGC 2023The contribution of scattered light to the total nebular emission is determined on the basis of linear polarization measurements at 1.25, 1.65, and 2.2 microns of the visual reflection nebulae NGC 7023 and NGC 2023. The percentage polarization of NGC 7023 slowly increases from 0.3 to 1 micron, with peak polarizations of up to 26 percent at 1.25 micron, then rapidly decreases, with values of 4-7 percent at 2.2 microns. This is interpreted as implying that scattered starlight contributes most to the SW emission, while unpolarized emission from small grains or large molecules dominates at longer wavelengths. IR polarization and surface brightness measurements are combined to derive the intensity of scattered light, which is then compared with scattering models. While the near-IR emission of both NGC 2023 and NGC 7023 is dominated by small-grain or large-molecule emission, IR scattered light plays a larger role in NGC 2023 than in NGC 7023.
Document ID
19930032126
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sellgren, K.
(Ohio State Univ. Columbus, United States)
Werner, M. W.
(NASA Ames Research Center Moffett Field; JPL, Pasadena, CA, United States)
Dinerstein, H. L.
(Texas Univ. Austin, United States)
Date Acquired
August 15, 2013
Publication Date
November 20, 1992
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 400
Issue: 1
ISSN: 0004-637X
Subject Category
Astrophysics
Distribution Limits
Public
Copyright
Other
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