Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...349..107p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 349, Jan. 20, 1990, p. 107-119. Research supported by NASA.
Astronomy and Astrophysics
Astronomy
93
Cosmic Dust, Infrared Sources (Astronomy), Interstellar Matter, Reflection Nebulae, Brightness Distribution, Interstellar Extinction, Light Scattering, Optical Thickness, Particle Size Distribution, Polarized Radiation
Scientific paper
A model has been developed for reflection nebulae around luminous IR sources embedded in dense dust clouds. The shape of the IR spectrum is shown to be the result of a combination of the scattering properties of the dust, the spectrum of the illuminating source, and foreground extinction, while geometry plays a minor role. Comparison of the model results with IR observations of the reflection nebula surrounding OMC-2/IRS 1 shows that either a grain size distribution like that found in the diffuse ISM, or consisting of larger grains, can explain the observed shape of the spectrum. However, the absolute intensity level of the scattered light, as well as the observed polarization, requires large grains. By adding water-ice mantles to the silicate and graphite cores, the 3.08 micron ice-band feature observed in the spectra of several IR reflection nebulae has been modeled. It is shown that this ice band arises naturally in optically thick reflection nebulae containing ice-coated grains.
Pendleton Yvonne J.
Tielens Alexander G. G. M.
Werner Michael W.
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