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

Research output: Contribution to journalArticlepeer-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 languageEnglish
Article number120
JournalPublications of the Astronomical Society of Japan
Volume65
Issue number6
DOIs
Publication statusPublished - 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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