MIRIS observation of near-infrared diffuse Galactic light
  We report near-infrared (IR) observations of high Galactic latitude clouds to
investigate diffuse Galactic light (DGL), which is starlight scattered by
interstellar dust grains. The observations were performed at $1.1$ and
$1.6\,\rm{\mu m}$ with a wide-field camera instrument, the Multi-purpose
Infra-Red Imaging System (MIRIS) onboard the Korean satellite STSAT-3. The DGL
brightness is measured by correlating the near-IR images with a far-IR
$100\,\rm{\mu m}$ map of interstellar dust thermal emission. The wide-field
observation of DGL provides the most accurate DGL measurement achieved to date.
We also find a linear correlation between optical and near-IR DGL in the MBM32
field. To study interstellar dust properties in MBM32, we adopt recent dust
models with or without $\rm{\mu m}$-sized very large grains and predict the DGL
spectra, taking into account reddening effect of interstellar radiation field.
The result shows that observed color of the near-IR DGL is closer to the model
spectra without very large grains. This may imply that dust growth in the
observed MBM32 field is not active owing to its low density of interstellar
medium.
