Abstract of Junho Shin's Paper

The Distribution of Dust inside the Orion Nebula

Junho Shin

Department of Astronomy
Seoul National University
Seoul, Korea


ABSTRACT

By inverting the brightness integrals for the dust-scattered continuum and thermal emission, we have determined how the dust grains are distributed inside the Orion nebula. The radial distance dependence of the volumetric scattering cross section in the ultraviolet and optical wavelengths is quite similar to that of the volumetric absorption cross section in the far infrared wavelength : the dust grains are depleted in the central region of the Orion nebula, and are concentrated in the region of 5' - 6' away from the Trapezium stars. The Orion dust is of moderately forward throwing nature, and has low values of albedo in the ultraviolet and optical wavelengths. Because we have used in this study the observations of entirely different nature and at widely different wavelengths, i.e., the scattered stellar continuum in the ultraviolet and optical wavelengths and the thermal re-emission of the absorbed stellar light in the far infrared, we think that the shell-like structure in the dust distribution is now a well-established characteristics of the Orion nebula.


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