Abstract
We first obtained the spectrum of the diffuse Galactic light (DGL) at general interstellar space in the 1.8-5.3μm wavelength region with the low-resolution prism spectroscopy mode of the AKARI Infra-Red Camera (IRC) NIR channel. The 3.3μm PAH band is detected in the DGL spectrum at Galactic latitude / b / < 15°, and its correlations with the Galactic dust and gas are confirmed. The correlation between the 3.3μm PAH band and the thermal emission from the Galactic dust is expressed not by a simple linear correlation, but by a relation with extinction. Using this correlation, the spectral shape of DGL at an optically thin region (5°< / b / < 15°) was derived as a template spectrum. Assuming that the spectral shape of this template spectrum is uniform at any position, the DGL spectrum can be estimated by scaling this template spectrum using the correlation between the 3.3μm PAH band and the thermal emission from the Galactic dust.
Original language | English |
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Article number | 120 |
Journal | Publications of the Astronomical Society of Japan |
Volume | 65 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2013 Dec 5 |
Keywords
- Extinction
- ISM: dust
- ISM: general
- ISM: lines and bands
- Infrared: ISM
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science