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The Korean Astronomical Society (한국천문학회)
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ICE ABSORPTION FEATURES IN NIR SPECTRA OF GALACTIC OBJECTS

  • Mori, Tamami I. (Department of Astronomy, Graduate School of Science, The University of Tokyo) ;
  • Onaka, Takashi (Department of Astronomy, Graduate School of Science, The University of Tokyo) ;
  • Sakon, Itsuki (Department of Astronomy, Graduate School of Science, The University of Tokyo) ;
  • Ohsawa, Ryou (Department of Astronomy, Graduate School of Science, The University of Tokyo) ;
  • Kaneda, Hidehiro (Graduate School of Science, Nagoya University) ;
  • Yamagishi, Mitsuyoshi (Graduate School of Science, Nagoya University) ;
  • Okada, Yoko (I. Physikalisches Institut, Universit at zu Koln) ;
  • Tanaka, Masahiro (Astronomical Institute, Graduate School of Science, Tohoku University) ;
  • Shimonishi, Takashi (Department of Earth and Planetary Sciences, Graduate School of Science, Kobe University)
  • Received : 2016.10.10
  • Accepted : 2016.11.16
  • Published : 2017.03.31
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Abstract

We present results of AKARI/IRC near-infrared (NIR) slit-spectroscopy ($2.5-5.0{\mu}m$, R ~ 100) of Galactic sources, focusing on ice absorption features. We investigate the abundance of $H_2O$ and $CO_2$ ices and other ice species (CO and XCN ices) along lines of sight towards Galactic H $\small{II}$ regions, massive YSOs, and infrared diffuse sources. Even among those different kinds of astronomical objects, the abundance ratio of $CO_2$ to $H_2O$ ices does not vary significantly, suggesting that the pathway to $CO_2$ ice formation driven by UV irradiation is not effective at least among the present targets.

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References

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