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Observational study on near-infrared (IR) scattering properties ofinterstellar dust grains has been limited due to its faintness. Using all-skymaps obtained from Diffuse Infrared Background Experiment (DIRBE), weinvestigate the scattering property from diffuse Galactic light (DGL)measurements at 1.25, 2.2, and 3.5 {\mu}m in addition to our recent analyses ofdiffuse near-IR emission (Sano et al. 2015; Sano et al. 2016). As a result, wefirst find that the intensity ratios of near-IR DGL to 100 {\mu}m emissionincrease toward low Galactic latitudes at 1.25 and 2.2 {\mu}m. The derivedlatitude dependence can be reproduced by a scattered light model ofinterstellar dust with a large scattering asymmetry factor g = <cos{\theta}> of$0.8^{+0.2}_{-0.3}$ at 1.25 and 2.2 {\mu}m, assuming an infinite Galaxy disk asan illuminating source. The derived asymmetry factor is comparable to thevalues obtained in the optical, but several times larger than that expectedfrom a recent dust model. Since possible latitude dependence ofultraviolet-excited dust emission at 1.25 and 2.2 {\mu}m would reduce the largeasymmetry factor to the reasonable value, our result may indicate the firstdetection of such an additional emission component in the diffuse interstellarmedium.

First Detection of Galactic Latitude Dependence of Near-Infrared Diffuse Galactic Light from DIRBE Reanalysis