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Radiative transfer models in a spherical, turbulent interstellar medium (ISM)in which the photon source is situated at the center are calculated toinvestigate the correlation between the scattered light and the dust columndensity. The medium is modeled using fractional Brownian motion structures thatare appropriate for turbulent ISM. The correlation plot between the scatteredlight and optical depth shows substantial scatter and deviation from simpleproportionality. It was also found that the overall density contrast issmoothed out in scattered light. In other words, there is an enhancement of thedust-scattered flux in low-density regions, while the scattered flux issuppressed in high-density regions. The correlation becomes less significant asthe scattering becomes closer to be isotropic and the medium becomes moreturbulent. Therefore, the scattered light observed in near-infrared wavelengthswould show much weaker correlation than the observations in optical andultraviolet wavelengths. We also find that the correlation plot betweenscattered lights at two different wavelengths shows a tighter correlation thanthat of the scattered light versus the optical depth.

Dust Scattering In Turbulent Media: Correlation Between The Scattered Light and Dust Column Density