期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
卷 70, 期 4, 页码 -出版社
OXFORD UNIV PRESS
DOI: 10.1093/pasj/psy070
关键词
dust, extinction; infrared: ISM; ISM: clouds; scattering
资金
- Japanese Society for the Promotion of Science, KAKENHI [26800112, 21111004, 15H05744]
- Ministry of Science, ICT and Future Planning (MSIP) of Korea [NRF-2014M1A3A3A02034746]
- Grants-in-Aid for Scientific Research [15H05744] Funding Source: KAKEN
- National Research Foundation of Korea [2014M1A3A3A02034746] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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 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 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 and without mu m-sized very large grains and predict the DGL spectra, taking into account the reddening effect of the interstellar radiation field. The result shows that the 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 the low density of its interstellar medium.
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