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- W2762809306 abstract "Near-infrared (IR) diffuse Galactic light (DGL) consists of scattered light and thermal emission from interstellar dust grains illuminated by interstellar radiation field (ISRF). At 1.25 and 2.2um, recent observational study shows that intensity ratios of the DGL to interstellar 100um dust emission steeply decrease toward high Galactic latitudes (b). In this paper, we investigate origin(s) of the b-dependence on the basis of models of thermal emission and scattered light. Combining a thermal emission model with regional variation of the polycyclic aromatic hydrocarbon abundance observed with Planck, we show that contribution of the near-IR thermal emission component to the observed DGL is less than ~20%. We also examine the b-dependence of the scattered light, assuming a plane-parallel Galaxy with smooth distributions of the ISRF and dust density along vertical direction, and assuming a scattering phase function according to a recently developed model of interstellar dust. We normalize the scattered light intensity to the 100um intensity corrected for deviation from the cosecant-b law according to the Planck observation. As the result, the present model taking all the b-dependence of dust and ISRF properties can account for the observed b-dependence of the near-IR DGL. However, uncertainty of the correction for the 100um emission is large and other normalizing quantities may be appropriate for more robust analysis of the DGL." @default.
- W2762809306 created "2017-10-20" @default.
- W2762809306 creator A5020803722 @default.
- W2762809306 creator A5071791283 @default.
- W2762809306 date "2017-10-27" @default.
- W2762809306 modified "2023-10-17" @default.
- W2762809306 title "Galactic Latitude Dependence of Near-infrared Diffuse Galactic Light: Thermal Emission or Scattered Light?" @default.
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- W2762809306 doi "https://doi.org/10.3847/1538-4357/aa906c" @default.
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