AKARI near-infrared spectroscopy: Detection of H2O and CO 2 ICES toward young stellar objects in the Large Magellanic Cloud

Takashi Shimonishi, Takashi Onaka, Daisuke Kato, Itsuki Sakon, Yoshifusa Ita, Akiko Kawamura, Hidehiro Kaneda

研究成果: Article査読

41 被引用数 (Scopus)

抄録

We present the first results of AKARI Infrared Camera near-infrared spectroscopic survey of the Large Magellanic Cloud (LMC). We detected absorption features of the H2O ice 3.05 μm and the CO2 ice 4.27 μm stretching mode toward seven massive young stellar objects (YSOs). These samples are for the first time spectroscopically confirmed to be YSOs. We used a curve-of-growth method to evaluate the column densities of the ices and derived the CO2/H2O ratio to be 0.45 ± 0.17. This is clearly higher than that seen in Galactic massive YSOs (0.17 ± 0.03). We suggest that the strong ultraviolet radiation field and/or the high dust temperature in the LMC may be responsible for the observed high CO2 ice abundance.

本文言語English
ページ(範囲)L99-L102
ジャーナルAstrophysical Journal
686
2 PART 2
DOI
出版ステータスPublished - 2008

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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