Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...132l...1r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 132, no. 1, March 1984, p. L1-L4.
Astronomy and Astrophysics
Astronomy
24
Infrared Astronomy, Interstellar Matter, Optical Polarization, Orion Nebula, Particle Size Distribution, Reflection Nebulae, Astronomical Models, Interstellar Extinction, Light Scattering, Radiant Flux Density
Scientific paper
The grain size in the Orion molecular cloud is estimated using a model for the IRC4 source of the Orion infrared cluster which is self-consistent in terms of grain properties, geometry, and radiative transfer. The model depicts the source as an elongated cylinder of moderate optical thickness in which scattering of infrared photons is treated by conventional transfer theory. A picture of the region consistent with both polarization and flux measurements at 2.2 and 3.8 microns is obtained. The typical grain radius ranges between 0.4 and 0.6 micron. The ratio of extinction in front of IRC2 at 9.7 and 3.8 microns can be reproduced by the model for a grain radius greater than 0.6 micron. These results show that the grain size in the Orion molecular cloud is significantly larger than in the diffuse interstellar medium.
Leger Alain
Rouan Daniel
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