Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...400..238s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 400, no. 1, p. 238-247.
Astronomy and Astrophysics
Astrophysics
45
Cosmic Dust, Infrared Radiation, Interstellar Extinction, Interstellar Matter, Light Scattering, Reflection Nebulae, Linear Polarization, Near Infrared Radiation, Stellar Spectra
Scientific paper
The 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.
Dinerstein Harriet L.
Sellgren Kris
Werner Michael W.
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