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

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)L99-L102
JournalAstrophysical Journal
Volume686
Issue number2 PART 2
DOIs
Publication statusPublished - 2008

Keywords

  • Abundances
  • Circumstellar matter
  • Dust
  • Extinction
  • ISM
  • Magellanic clouds
  • Molecules
  • Pre-main-sequence
  • Stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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