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.