Low-resolution spectrum of the diffuse galactic light and 3.3μm PAH emission with the AKARI infRared camera

Kohji Tsumura; Toshio Matsumoto; Shuji Matsuura; Itsuki Sakon; Masahiro Tanaka; Takehiko Wada

doi:10.1093/pasj/65.6.120

Low-resolution spectrum of the diffuse galactic light and 3.3μm PAH emission with the AKARI infRared camera

Kohji Tsumura, Toshio Matsumoto, Shuji Matsuura, Itsuki Sakon, Masahiro Tanaka, Takehiko Wada

Creative Interdisciplinary Research Division

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

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
Article number	120
Journal	Publications of the Astronomical Society of Japan
Volume	65
Issue number	6
DOIs	https://doi.org/10.1093/pasj/65.6.120
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

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title = "Low-resolution spectrum of the diffuse galactic light and 3.3μm PAH emission with the AKARI infRared camera",

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.",

keywords = "Extinction, ISM: dust, ISM: general, ISM: lines and bands, Infrared: ISM",

author = "Kohji Tsumura and Toshio Matsumoto and Shuji Matsuura and Itsuki Sakon and Masahiro Tanaka and Takehiko Wada",

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T1 - Low-resolution spectrum of the diffuse galactic light and 3.3μm PAH emission with the AKARI infRared camera

AU - Tsumura, Kohji

AU - Matsumoto, Toshio

AU - Matsuura, Shuji

AU - Sakon, Itsuki

AU - Tanaka, Masahiro

AU - Wada, Takehiko

PY - 2013/12/5

Y1 - 2013/12/5

N2 - 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.

AB - 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.

KW - Extinction

KW - ISM: dust

KW - ISM: general

KW - ISM: lines and bands

KW - Infrared: ISM

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