MIRIS observation of near-infrared diffuse Galactic light

PASJ: Publications of the Astronomical Society of Japan

Jeong, Woong-Seob¹  Matsuura, Shuji¹  Arai, Toshiaki²  Onishi, Yosuke²  Ienaka, Nobuyuki³  Tsumura, Kohji³  Sano, Kei³  Nakagawa, Takao⁴  Matsuhara, Hideo⁴  Park, Younsik⁴  Shirahata, Mai⁴  Lee, DaeHee⁴  Kim, MinGyu⁴  Han, Wonyong⁴  Matsumoto, Toshio⁴  Pyo, Jeonghyun⁴  Moon, Bongkon⁴  Seo, Hyun Jong⁴  Park, Wonkee⁵  Kim, Il-Jong⁵ 

[1] Department of Physics, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan;Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8550, Japan;Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan;Korea Astronomy and Space Science Institute, 776, Daedeok-daero, Yuseong-gu, Daejeon 305-348, Republic of Korea;Korea University of Science and Technology, 217, Gajeong-ro, Yuseong-gu, Daejeon 34113, Korea

关键词: infrared: ISM;    ISM: clouds;    (ISM:) dust, extinction;   

DOI  :  10.1093/pasj/psy070

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

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 μm 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 μm 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 μm-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.

【 授权许可】

CC BY